Message-ID: <000a01c100d5$cc12c220$0a13a9ac@7jwvh01> From: parts@radparts.com To: linac-eng@plato1.aristotle.net, GDO7Q@hscmail.mcc.virginia.edu Subject: RMS-2000 in room monitor Date: Fri, 29 Jun 2001 11:57:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Subj: RMS-2000 in room monitor Date: 6/29/2001 2:19:50 PM Central Daylight Time From: GDO7Q@hscmail.mcc.virginia.edu (Orsolini, Joe D) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net ('Linac Engineering Group') File: RMS2000i (2781 bytes) DL Time (655360 bps): < 1 minute Has anyone had to replace the in room monitor on the RMS-2000? Varian is quoting ~$4000 for a 19" VGA monitor, I'd like to replace it with a locally obtained flat panel LCD, has anyone done this before, and other than needing a 15pin to 9pin adapter have you had any problems.... furthermore, what monitor did you replace it with. Giuseppe 'Joe' Orsolini RT Imaging Physics Specialist University of Virginia Health System Department of Radiation Oncology Division of Radiological Physics Box 800375 Charlottesville, VA 22908-0375 *: orsolini@virginia.edu 434-924-9422 (w) 434-982-3520 (fax) 434-963-2220 (pager) >>>>>>>>>>>>>>>>>>>>>>>>>> Joe, Yes, you can use alternate VGA monitors for that application. We carry the adapters & monitors in stock but with shipping costs & prices being what they are on monitors, you'd do better getting it locally. If you need any help, give us a call. GL & Happy 4th, Randy@RadParts.com 877-704-3838 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RMS-2000 in room monitor Message-ID: From: "Orsolini, Joe D" To: 'Linac Engineering Group' Subject: RMS-2000 in room monitor Date: Fri, 29 Jun 2001 09:36:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has anyone had to replace the in room monitor on the RMS-2000? Varian is quoting ~$4000 for a 19" VGA monitor, I'd like to replace it with a locally obtained flat panel LCD, has anyone done this before, and other than needing a 15pin to 9pin adapter have you had any problems.... furthermore, what monitor did you replace it with. Giuseppe 'Joe' Orsolini RT Imaging Physics Specialist University of Virginia Health System Department of Radiation Oncology Division of Radiological Physics Box 800375 Charlottesville, VA 22908-0375 *: orsolini@virginia.edu 434-924-9422 (w) 434-982-3520 (fax) 434-963-2220 (pager) ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: RMS-2000 in room monitor Message-ID: <3B3CDFF6.26FAD777@yale.edu> From: "Peter E. Vitali" To: "Orsolini, Joe D" Cc: 'Linac Engineering Group' Subject: Re: RMS-2000 in room monitor Date: Fri, 29 Jun 2001 12:09:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Joe: Replace it with a 21" NEC Monitor. Sell for less than $1000.00 today. It is easier if it has the correct connector on it, I used a 15 IBM to 9 RS232 converter because the Monitor came with its own cable with 9 pin connector. Its nothing special, just old computer technology. As a matter of fact when we converted to VARiS I left the NEC in the room. Works fine. Biggest problem I have is with those ribbon 5 coax cable connectors that come on the Varian Room Cables. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Spares required for X-ray generator Saturn 850 X12 (UK) Message-ID: <8222D85CA4C0D411BEE6009027177A674B9A96@NTAS004> From: "Young, Bob" To: "'linac-eng@plato1.aristotle.net'" Subject: Spares required for X-ray generator Saturn 850 X12 (UK) Date: Thu, 28 Jun 2001 04:58:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At the Sussex Oncology Centre we have a rather old Philips Simulator that we have to keep running for the next 1.5 years, with spares rapidly diminishing from the Manufacturer's stocks. The X-ray generator is a Saturn 850 X12. It is the generator that is of particular concern to us because of the lack of spare PCBs at Philips Hammersmith, but we would like to obtain any relevant spares that may become available from the de-installation of similar generators in the UK. I would like to hear from any Oncology Centre or X-Ray department that may be de-installing a similar generator in the UK in the foreseeable future, where the parts may otherwise be scrapped. We could arrange to remove and transport any useful items for storage at our site, which could give us the confidence of supporting this machine in its final years. Here's hoping! Bob Young Senior Electronics Engineer Medical Physics Engineering, Royal Sussex County Hospital, Eastern Road, Brighton, East Sussex, BN2 5BE, England. Phone +44(0)1273 696955 Bleep 8273 Fax +44(0)1273 664698 Email Bob.Young@brighton-healthcare.nhs.uk > =========================================================== > This message and any attachments to it is intended only for the > individual or company to which it is addressed and may contain > information which is privileged, confidential or prohibited from > disclosure or unauthorised use. If the recipient of this transmission > is not the intended recipient, or the employee or agent responsible > for delivering such materials to the intended recipient, you are > hereby notified that any use, any form of reproduction, dissemination, > copying, disclosure, modification, distribution and/or publication of > this e-mail message or its attachments other than by its intended > recipient is strictly prohibited by the sender. > If you have received it in error, please notify us immediately using > the address "postmaster@brighton-healthcare.nhs.uk and destroy the > message and all copies in your possession. > =========================================================== > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: OH&S Message-ID: <4064724DF431D31183EF00805F8BC6E2013BB1D6@exch.dchs.tas.gov.au> From: Cripps Steve To: "Linac Engineers List Server (E-mail)" Subject: OH&S Date: Tue, 26 Jun 2001 22:12:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, I have recently been asked to produce an OH&S "Hazardous Materials" register and "Hazardous Procedures" register for our department. This seems like a very time consuming task, so I thought one of my fellow Linac Engies might have done this already. Any help will be thankfully received. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Australia * Direct (03) 6222 8618 * Switch (03) 6223 4000 * Mobile 0408 136 906 * International +61 3 6223 4000 * steve.cripps@dchs.tas.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Planning system / RV system using Samba Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Planning system / RV system using Samba Date: Tue, 26 Jun 2001 14:39:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Samba is a software product that makes NT style disk shares appear on a UNIX box. Typically used by planning systems to interface to RV / MLC etc. I notice on the Samba site that there has been a security issue recently. It may be worth checking it through with your vendors / IT dept. http://samba.mirror.aarnet.edu.au/samba/whatsnew/macroexploit.html It probably will not be an issue but it's worth checking out. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens MD-2 ODI Message-ID: From: "Rozenblat, Alex" To: "'andrer@health.nb.ca'" Cc: 'linac' Subject: RE: Siemens MD-2 ODI Date: Tue, 26 Jun 2001 13:29:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, wise guys First of all, thank you all who gave me the leads to Relay I asked some time ago. Secondly, in regard to ODI/Rad centre issue. I spoke to one of our physicists and he referred me to an article published by Medical Physics, vol. 19, No 2, Mar/Apr 1992 (pp. 357-359) originated by our Med. Physics Dept. addressing this issue. When described phenomena was discovered Siemens was notified right away - so they new about it since (at least) 1992. Recently, we were lucky (!!) to receive the first Primus with modified/new style Gantry, which is evaluated by our Dept. as a GOOD one as far ODI/Rad centre coincidence is concerned. So, line up for new machines. Regards, Alex Rozenblat, Electronics Techn. TSRCC, Toronto I merely express my humble opinion. -----Original Message----- From: andrer@health.nb.ca [mailto:andrer@health.nb.ca] Sent: Friday, June 22, 2001 10:42 AM To: Watters, Dan Cc: 'linac-eng@plato1.aristotle.net' Subject: Re: Siemens MD-2 ODI Hi Dan, Since the ODI and radiation centre are not at the same positions mechanically, they will not produce the same "somewhat of a circle" when the gantry is rotated 360. One has to trace the radiation beam and adjust the LASERs in the centre of the trace. And the same for the ODI, add/substract half of the sag diameters in both directions AP/PA. It is another problem if you are not in the centre of the sag of gantry 270/90. The ODI should not be spot on at gantry 0 degree, it should be 100.2 and should be 99.7 at gantry 180 degrees. Hope this helps, I do not have any experience with your beam checker however. Andre Robichaud, CET Moncton NB Canada "Watters, Dan" wrote: > Hello All, > > Just recently our therapists have been checking the ODI against the Mick Iso > Beam Checker (better known in therapists speak as the "plastic thingy") in > the lateral positions. Previously the therapists and I were only checking > the ODI with the gantry at "0". The problem we are seeing is the ODI being > spot on at "0" degrees, including linearity, but we are off by 3 to 5 mm on > the lateral checks. I noticed in the ATP for the system that the ODI is > only checked with the gantry at "0". Doing the gantry rotation using the > front pointer and a pointer stand on the table the results are satisfactory. > After spending 4 hours playing with the ODI last night I am now trying to > figure out if I am at fault or is this an anomaly of the system or the iso > checker. We are flipping the checker to vertical position in the right > direction. Any insight into this problem would be greatly appreciated. > > Thanks as always, > > Dan Watters > UMC Tucson, AZ. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: fiber-optic cables Message-ID: <3B38DDB6.EF5237E0@yale.edu> From: "Peter E. Vitali" To: mike nordin Cc: Linac-eng@plato1.aristotle.net Subject: Re: fiber-optic cables Date: Tue, 26 Jun 2001 11:10:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike: We purchased the Fluke Fiber Optic Power Meter (FOM) which plugs into any DMM and the Fiber Optic Light Source (FOS-850/1300). The cables are the ST/ST type. We purchased them from Newark Electronics. We also purchased all of their patch cords (2 ea.) and couplings available (3 other combinations). The other three types of cables can be used for other fiber optics systems that you may have. The FOS was $495.00 and the FOM was $295.00. The cables ranged from $32.00 to $50.00 each. We made up a table and recorded all the reading for each Fiber optic cable in the MLC System separately and then as a combination of the three cables that make up the transmit or receive line. The combination takes in the couplings in the system which there are two. We recorded for both frequencies, 850 and 1300. We found that the reading for the combination of the three cables plus 2 couplings gave a lower reading than if you added the same individual readings for the three cables in the combination. Example, The Blue code cables: C to S: -10.4 db, Sto G: -10.6 db, G to MLC: -11.7db. Total would be -32.7db. The combination from C to MLC was -15.4db. Has anyone else done this? I would like to compare numbers with you to see if we can come up with a ballpark figure for each cable and combination. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: fiber-optic cables Message-ID: <6532241.993576788659.JavaMail.imail@chilly.excite.com> From: mike nordin To: Linac-eng@plato1.aristotle.net Subject: fiber-optic cables Date: Tue, 26 Jun 2001 09:33:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm looking to purchase fiber-optic patch cords to troubleshoot Varian Mlc products. I would appreciate any information on connecter and cable type and relevent specifications. Thanks Mike Nordin _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Old Odelft Simulyx Manuals Message-ID: <12c.8aea21.28692479@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Old Odelft Simulyx Manuals Date: Mon, 25 Jun 2001 15:34:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone .. I am in need of the early model Odelft Simulyx Manuals. Any help would be appreciated. Thanks in advance !! Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 3M Laser Imager Message-ID: <62.10705e86.286925bd@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: 3M Laser Imager Date: Mon, 25 Jun 2001 15:39:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone ... I'm trying to locate technical manuals .. specifically, installation manuals for a 1993 vintage 3M Laser Imager model # M959 XL. Any information would be greatly appreciated. Thanks in advance. Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Stabilipan 300 kV insert Message-ID: <200106250736_MC3-D70B-2E99@compuserve.com> From: Geoff Condliffe <101642.666@compuserve.com> To: "Linac.eng" Subject: Siemens Stabilipan 300 kV insert Date: Mon, 25 Jun 2001 03:33:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear all, We have available a Siemens Stabilipan 300kV X-Ray Therapy Tube Insert. If anyone is interested in this insert please contact Geoff Condliffe at 101642.666@compuserve.com regards. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens MD-2 ODI Message-ID: <3.0.6.32.20010625203008.007b5ab0@pop.senet.com.au> From: Andrew Kovendy To: linac-eng@plato1.aristotle.net Subject: Re: Siemens MD-2 ODI Date: Mon, 25 Jun 2001 03:30:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi to Siemens MD-2 users .. We found exactly the same thing with our 3-year old Primus and on our new MD-2 . We determined the mechanical isocentre (IEC 976) on the Primus using an independent horizontal-axis pointer and then set the ODI to 100.0 at AP. Using an in-air scanner at 90/270 we found the radiation isocentre vertical position was 1.5mm below this point so we set up the lasers to match the 'radiation isocentre'. Then we found an ODI reading of 996 at the PA position and verified this shift using a mechanical pointer. We since queried Siemens about this problem and they suggested adjustment of the structure cross-bars or excessive collimator bearing play. Then we found the same thing -only worse -on our newly-installed MD-2 (fitted with MLC) a couple of months ago. After a similar amount of optical system checking and head-scratching we have since learned that Siemens have known of the different radiation and mechanical isocentres for years -the mechanical isocentre on our MD-2 is 2mm above the radiation isocentre - and could have saved us a lot of time if they had informed us of this 'anomaly' . I am surprised that more Siemens customers haven't complained of this ... doesn't everybody check their ODI at all angles ?? Siemens are apparently redesigning their structure to solve this problem but that doesn't help us with existing machines. Mr. Robichaud's solution is the logical approach but our therapists won't like having two different numbers for AP and PA isocentric setups !! We are currently assessing the ramifications of this problem with our conformal/IMRT program. Any other Siemens users with this problem ?? Andrew Kovendy Physicist Adelaide Radiotherapy Centre South Australia ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Philips SLS s/n 6507 Simulator Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: Philips SLS s/n 6507 Simulator Date: Fri, 22 Jun 2001 09:12:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Our clinic wants to keep our convertional Sim for a few more years. In the last 9 months we have twice lost the Memory board (AL18 )and the MPU board (AL20). These are in the SLS cabinet AL section and plug into the GesBus-12M cardrack. Replacement of these boards is very expensive and I'm considering doing away with the cardrack by making our own interfacing PCB's and using a PC and writing the necessary programs. But thats a lot of work and I'm wondering if anyone else has already done this, or if anyone knows of an upgraded retro-fit to the AL section. David Burgess Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens MD-2 ODI Message-ID: <3B33591F.79B3E9D1@health.nb.ca> From: andrer@health.nb.ca Reply-To: andrer@health.nb.ca To: "Watters, Dan" Cc: "'linac-eng@plato1.aristotle.net'" Subject: Re: Siemens MD-2 ODI Date: Fri, 22 Jun 2001 06:41:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dan, Since the ODI and radiation centre are not at the same positions mechanically, they will not produce the same "somewhat of a circle" when the gantry is rotated 360. One has to trace the radiation beam and adjust the LASERs in the centre of the trace. And the same for the ODI, add/substract half of the sag diameters in both directions AP/PA. It is another problem if you are not in the centre of the sag of gantry 270/90. The ODI should not be spot on at gantry 0 degree, it should be 100.2 and should be 99.7 at gantry 180 degrees. Hope this helps, I do not have any experience with your beam checker however. Andre Robichaud, CET Moncton NB Canada "Watters, Dan" wrote: > Hello All, > > Just recently our therapists have been checking the ODI against the Mick Iso > Beam Checker (better known in therapists speak as the "plastic thingy") in > the lateral positions. Previously the therapists and I were only checking > the ODI with the gantry at "0". The problem we are seeing is the ODI being > spot on at "0" degrees, including linearity, but we are off by 3 to 5 mm on > the lateral checks. I noticed in the ATP for the system that the ODI is > only checked with the gantry at "0". Doing the gantry rotation using the > front pointer and a pointer stand on the table the results are satisfactory. > After spending 4 hours playing with the ODI last night I am now trying to > figure out if I am at fault or is this an anomaly of the system or the iso > checker. We are flipping the checker to vertical position in the right > direction. Any insight into this problem would be greatly appreciated. > > Thanks as always, > > Dan Watters > UMC Tucson, AZ. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Electrometers........ Message-ID: From: "Urmanita, Ted" To: 'Randy Wick' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: Electrometers........ Date: Fri, 22 Jun 2001 06:32:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, You could get them at: CNMC 2817B Lebanon rd. Nashville Tennessee, 37214 phone:1-800-635-2662 They come in two sizes for 5.34mm(gray cable) and for 3mm(white cable). Good day, Ted Urmanita UCLA Med Center RADONC -----Original Message----- From: Randy Wick [mailto:rwick@bccancer.bc.ca] Sent: Thursday, June 21, 2001 2:56 PM To: 'Linac-eng list' Subject: RE: Electrometers........ Were you able to find a source for replacement triax connectors? We searched around for quite a while but they seem to be pretty scarce. ----------------------------------- Randy Wick Radiotherapy Service Fraser Valley Cancer Centre Surrey, BC Canada rwick@bccancer.bc.ca -----Original Message----- From: Urmanita, Ted [ mailto:LMTMU1@MEDNET.ucla.edu ] Sent: Friday, June 15, 2001 7:11 AM To: 'Dave Pinchin' Cc: 'linac-eng@plato1.aristotle.net' Subject: RE: Electrometers........ Hi Dave, These metal shavings you are seeing are coming from the shield cable itself and compressed by the triax connector. In time, (through number of usage,reattaching of cable) these fragments develops and weakens the conductivity of the shield until it will eventually remained open. I usually repair them by cutting the cable and reattach the triax connector.Female connector gets broken most often especially the contact tip, so I just replace them. I hope this help, Dave. Ted Urmanita UCLA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens MD-2 ODI Message-ID: <6CE096D0CDF4D211A3110008C75D075236064E@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Siemens MD-2 ODI Date: Thu, 21 Jun 2001 14:54:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, Just recently our therapists have been checking the ODI against the Mick Iso Beam Checker (better known in therapists speak as the "plastic thingy") in the lateral positions. Previously the therapists and I were only checking the ODI with the gantry at "0". The problem we are seeing is the ODI being spot on at "0" degrees, including linearity, but we are off by 3 to 5 mm on the lateral checks. I noticed in the ATP for the system that the ODI is only checked with the gantry at "0". Doing the gantry rotation using the front pointer and a pointer stand on the table the results are satisfactory. After spending 4 hours playing with the ODI last night I am now trying to figure out if I am at fault or is this an anomaly of the system or the iso checker. We are flipping the checker to vertical position in the right direction. Any insight into this problem would be greatly appreciated. Thanks as always, Dan Watters UMC Tucson, AZ. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Electrometers........ Message-ID: <3B3275DD.724A9AB3@scf.sk.ca> From: Scot Thiesson To: Randy Wick Cc: 'Linac-eng list' Subject: Re: Electrometers........ Date: Thu, 21 Jun 2001 14:31:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Electrosonic used to handle Pomona triax connectors but I haven't ordered them in awhile. As I recall they were also a special order item. I have also obtained them from Capintec at a much higher price. Scot Thiesson A.B.C.C. Regina. Randy Wick wrote: Were you able to find a source for replacement triax connectors? We searched around for quite a while but they seem to be pretty scarce. ----------------------------------- Randy Wick Radiotherapy Service Fraser Valley Cancer Centre Surrey, BC Canada rwick@bccancer.bc.ca -----Original Message----- From: Urmanita, Ted [ mailto:LMTMU1@MEDNET.ucla.edu ] Sent: Friday, June 15, 2001 7:11 AM To: 'Dave Pinchin' Cc: 'linac-eng@plato1.aristotle.net' Subject: RE: Electrometers........ Hi Dave, These metal shavings you are seeing are coming from the shield cable itself and compressed by the triax connector. In time, (through number of usage,reattaching of cable) these fragments develops and weakens the conductivity of the shield until it will eventually remained open. I usually repair them by cutting the cable and reattach the triax connector.Female connector gets broken most often especially the contact tip, so I just replace them. I hope this help, Dave. Ted Urmanita UCLA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Electrometers........ Message-ID: <3B327426.70315FB@yale.edu> From: "Peter E. Vitali" To: Randy Wick Cc: 'Linac-eng list' Subject: Re: Electrometers........ Date: Thu, 21 Jun 2001 14:27:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy: Trompeter Electronic, Inc. makes all types of Triax Connectors. They are located in California. They have Foreign Sales Representative's Offices in Australia, 4 in Canada, Chile, Central & S. America, Columbia, Germany, 4 in Great Britain, France, Hong Knog, India, Israel, 2 in Italy, 2 in Japan, Korea, Mexico, Netherlands, New Zealand, 2 in Norway, R.O.C., Singapore, Spain, Sweden Switzerland. They have a web site: www.tromperter.com The are the only ones I use and have been using them now for about 15 years. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Relay for Siemens linacs Message-ID: <000c01c0fa96$88f6fbe0$a381a3ac@7jwvh01> From: parts@radparts.com To: Alex.Rozenblat@tsrcc.on.ca, linac-eng@plato1.aristotle.net Subject: RE: Relay for Siemens linacs Date: Thu, 21 Jun 2001 13:09:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Alex, We have the replacement relays in stock - our product ID number is 26-0051. Our phone number is 877-704-3838 toll free, 847-735-8348 local; email parts@radparts.com . My Regards, Randy at RadParts Subj: Relay for Siemens linacs Date: 6/21/2001 3:21:33 PM Central Daylight Time From: Alex.Rozenblat@tsrcc.on.ca (Rozenblat, Alex) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net ('linac') CC: Bruce.Gillies@tsrcc.on.ca (Gillies, Bruce) Hello, dear colleagues, Does anyone know second source, an independent vendor or a substitute for a Potter and Brumfield relay, type R40-E1-X4-V800, 24 Vdc. This product has been discontinued by P&B for some time now. This relay is widely used in both Mevatrons and Primuses, in area S31 for once and on some other boards. Any leads are greatly appreciated. Coils are fine all the time but contacts despite of being gold plated deteriorate. Thank you. Alex Rozenblat, Electronics technologist, TSRCC, Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Electrometers........ Message-ID: <6BAF4D075F07D411B30900508B94CBA03E5541@SERVER20> From: Randy Wick To: 'Linac-eng list' Subject: RE: Electrometers........ Date: Thu, 21 Jun 2001 13:56:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Were you able to find a source for replacement triax connectors? We searched around for quite a while but they seem to be pretty scarce. ----------------------------------- Randy Wick Radiotherapy Service Fraser Valley Cancer Centre Surrey, BC Canada rwick@bccancer.bc.ca -----Original Message----- From: Urmanita, Ted [ mailto:LMTMU1@MEDNET.ucla.edu ] Sent: Friday, June 15, 2001 7:11 AM To: 'Dave Pinchin' Cc: 'linac-eng@plato1.aristotle.net' Subject: RE: Electrometers........ Hi Dave, These metal shavings you are seeing are coming from the shield cable itself and compressed by the triax connector. In time, (through number of usage,reattaching of cable) these fragments develops and weakens the conductivity of the shield until it will eventually remained open. I usually repair them by cutting the cable and reattach the triax connector.Female connector gets broken most often especially the contact tip, so I just replace them. I hope this help, Dave. Ted Urmanita UCLA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mercury or Electronic Barometer? Message-ID: <87DA8A9ECCCFD211B51E0008C7B15585021BD304@ftwex03.ftw.medcity.net> From: Barrett Marc To: "'Linac-Engineers, Listserver'" Subject: Mercury or Electronic Barometer? Date: Thu, 21 Jun 2001 11:23:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey y'all, In response to Peter's questions at the end of his e-mail to Phil:... "So this bring up the question, when you call the air port to verify that your mercury barometer is correct, are they using a mercury barometer or an electronic one? Does it matter?" No, it doesn't matter as long as you verify the Airport is giving you "Station Pressure" and not "Corrected to Sea Level". Pilots use barometric pressure corrected to sea level, and that is the "reading" the tower will give them. Just be sure of the readings you receive. If you are at higher altitudes, you could really mess things up using a corrected, "incorrect", reading. Marc R. Barrett Radiation Physicist, Service Coordinator, RSO Rapides Cancer Center ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Relay for Siemens linacs Message-ID: From: "Rozenblat, Alex" To: 'linac' Cc: "Gillies, Bruce" Subject: Relay for Siemens linacs Date: Thu, 21 Jun 2001 10:54:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, dear colleagues, Does anyone know second source, an independent vendor or a substitute for a Potter and Brumfield relay, type R40-E1-X4-V800, 24 Vdc. This product has been discontinued by P&B for some time now. This relay is widely used in both Mevatrons and Primuses, in area S31 for once and on some other boards. Any leads are greatly appreciated. Coils are fine all the time but contacts despite of being gold plated deteriorate. Thank you. Alex Rozenblat, Electronics technologist, TSRCC, Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mercury Baraometer Message-ID: <3B31F885.2CBF53F3@yale.edu> From: "Peter E. Vitali" To: philsilgen@Mropa.com Cc: "Linac-Engineers, Listserver" , "Medical Physics, Listserver" Subject: Mercury Baraometer Date: Thu, 21 Jun 2001 05:37:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Phil: We are an Eastern Hospital that has gone Mercury Free. We purchased an Electronic Digital Barometer from VAISALA. Vaisala has a web site at: www.vaisala.com. It can be purchased with up to 3 measuring channels in parallel for extreme accuracy. It is an absolute barometer which requires no calibrating. It also costs in the low $Ks. If you purchase it do not forget to purchase their power supply for it. This digital Barometer was designed to be used at "Air Ports". So this bring up the question, when you call the air port to verify that your mercury barometer is correct, are they using a mercury barometer or an electronic one? Does it matter? Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RF driver for Siemens KD. Message-ID: From: Darold Wong To: linac-Eng@plato1.aristotle.net Subject: RF driver for Siemens KD. Date: Wed, 20 Jun 2001 08:54:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Does anyone have a source for Solid state drivers (Siemens part number 1964878 ), darold ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Electrometers Message-ID: <3B2F9ECA.CFDAD4DE@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" , "Medical Physics, Listserver" Subject: Electrometers Date: Tue, 19 Jun 2001 10:51:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Afternoon All: I want to thank all who replied to my initial message. The replies I received from Bruce Rusnak and Rob Morrison sums it up nicely so I am copying them below: Subject: Electrometers and connectors Date: Fri, 15 Jun 2001 10:46:45 -0400 From: Rob Morrison To: peter.vitali@yale.edu Pete, I saw your email and could not help commenting. Keithley Radiation Measurements division, now Innovision, always used and I believe continue to use the BNC triax. Capintec on their electrometers typically used the TNC triax connector unless otherwise specified. I also believe that PTW used TNC triax as their standard but that may have changed in the past years. It makes sense to me that Electa use the TNC triax. Sincerely, Rob Morrison Subject: triax connectors Date: Fri, 15 Jun 2001 17:09:40 -0400 From: "Rusnak, Bruce" To: "'PETER.VITALI@YALE.EDU'" Mr. Vitali, thank you for your phone call regarding triax connectors on instruments and ion chambers. The triax BNC and triax TNC connectors have both been in use for more than 15 years. Traditionally, dosimetry instruments sold and used in the United States and Canada have triax BNC connectors. Those sold in much of the rest of the world have used triax TNC connectors. Short adaptor cables or "barrel" connectors are used to change from one type to another. Some ion chamber manufacturers will ask you to specify the connector. The first widely accepted electrometer was the Model 602 which is from the late 1960's. Its standard connector was the triax BNC. Bruce M. Rusnak Sr. Applications Engineer Inovision Radiation Measurements, LLC 6045 Cochran Road Cleveland, OH 44139 USA Voice: 800.850.4608 Voice: +1.440.248.9300 ext 2573 FAX: +1.440.349.2307 email: brusnak@inovision.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MFIL fault Message-ID: <3B2F7CB6.A498EE9B@wfubmc.edu> From: tcullen@wfubmc.edu To: Maryoko Tosilio , linac-eng@plato1.aristotle.net Subject: Re: MFIL fault Date: Tue, 19 Jun 2001 08:24:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Maryoko, I see now what you said about the disabling of the MFIL I/L. It must be the Step 2 status line coming out of the Fault Cond pcb. You're right, they could very well disable the I/L with this. It looks like they base the steps on two reference levels and trigger rates which makes sense. If you trigger at a higher rate you want have a near nothing for filament voltage. But at the same time you would expect the 5A current reference level to be functional on the vacion I/L pcb. I see there is also a ssr (K10) on the aux pwr pcb which will remove power when step2 goes high on the fault conditioning pcb. The ssr could be a suspect also. hope this helps Tim Cullen wrote: > Maryoko, the MFIL I/L is a current sense line which is translated from I to V, with a reference level of 5V = 5A. I don't see any disabling > of the MFIL I/L at a glance. You can look at this on the VACION I/L pcb schematic. During the times you have this problem you can also look > at the MAG I on your scope to see if the level is truly dropping below the reference. If not it could be the opto coupler is at fault. > Tim Cullen > > Maryoko Tosilio wrote: > > > Hi, > > > > A Varian 600C serial number 430 has intermittent MFIL fault at Step 2 !!! > > This puzzles me a lot, 'cause in step 2 there is no magnetron filmanet voltage and the system automatically disables the MFIL interlock. > > So far, the fault conditioning board has been replaced. > > Any suggestions? > > > > Maryoko Tosilio ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SL Handbook Message-ID: <9D4670F9FFF5D4119BED00508BE22C1D11AFDF@ARTEMIS> From: "Whitlock, Brian" To: "linac eng (E-mail)" Subject: SL Handbook Date: Tue, 19 Jun 2001 06:53:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone out there have a copy of SL Manual 4513 370 35023 This is for planned maintenance on the SL. We were not supplied this manual and it is no longer available, so would be looking for a photocopy of some pages if possible. Brian Whitlock Radiotherapy Physics Poole Hospital Longfleet Road Poole, Dorset. BH15 2JB Tel 01202 448175 email bwhitlock@poole-tr.swest.nhs.uk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MFIL fault Message-ID: <3B2F6F43.821CB609@bellsouth.net> From: Gil Head To: Maryoko Tosilio Cc: linac-eng@plato1.aristotle.net Subject: Re: MFIL fault Date: Tue, 19 Jun 2001 07:26:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Maryoko Tosilio wrote: > > Hi, > > A Varian 600C serial number 430 has intermittent MFIL fault at Step 2 !!! > This puzzles me a lot, 'cause in step 2 there is no magnetron filmanet voltage and the system automatically disables the MFIL interlock. > So far, the fault conditioning board has been replaced. > Any suggestions? > > Maryoko Tosilio In Step 2 there is supposed to be no filament voltage, if there is indeed voltage when it goes above 5 volts you will get a mfil. This could happen if you only get partial stepping or improper stepping. This actually happened to us, the CL600 would run for a couple hundred monitor units then get a mfil. Watching the screen voltage you could watch mfil increase during the run until it indicated 5 volts and then a mfil occurred. Monitoring the LED's on the vacion i/l pcb with a camera revealed that the mfil il led was coming on. That said our last mfil was a defective optocoupler on the input interface pcb. Gil -- "Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself." Mark Twain ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MFIL fault Message-ID: <3B2F51D3.22FAA48C@wfubmc.edu> From: tcullen@wfubmc.edu To: Maryoko Tosilio Cc: linac-eng@plato1.aristotle.net Subject: Re: MFIL fault Date: Tue, 19 Jun 2001 05:21:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Maryoko, the MFIL I/L is a current sense line which is translated from I to V, with a reference level of 5V = 5A. I don't see any disabling of the MFIL I/L at a glance. You can look at this on the VACION I/L pcb schematic. During the times you have this problem you can also look at the MAG I on your scope to see if the level is truly dropping below the reference. If not it could be the opto coupler is at fault. Tim Cullen Maryoko Tosilio wrote: > Hi, > > A Varian 600C serial number 430 has intermittent MFIL fault at Step 2 !!! > This puzzles me a lot, 'cause in step 2 there is no magnetron filmanet voltage and the system automatically disables the MFIL interlock. > So far, the fault conditioning board has been replaced. > Any suggestions? > > Maryoko Tosilio ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MFIL fault Message-ID: <0e55c4803021361YELLOW@yellow.mcis.hutchcity.com> From: Maryoko Tosilio To: linac-eng@plato1.aristotle.net Subject: MFIL fault Date: Mon, 18 Jun 2001 18:03:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, A Varian 600C serial number 430 has intermittent MFIL fault at Step 2 !!! This puzzles me a lot, 'cause in step 2 there is no magnetron filmanet voltage and the system automatically disables the MFIL interlock. So far, the fault conditioning board has been replaced. Any suggestions? Maryoko Tosilio ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Mevatron Power Supply Message-ID: From: Ken Allen To: linac-eng@plato1.aristotle.net Subject: Siemens Mevatron Power Supply Date: Mon, 18 Jun 2001 13:37:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, We've got an older Siemens Mevatron (MX-2 SN 1963) that decided that it didn't want the 5volt, 25 Amp Power Supply in the Deskstand style Console anymore. Unfortunately for us this isn't something we'd normally stock so we're on the lookout for Siemens Part No. (we think) 3139649. The original was made by Konstanter, model KA 283N 5 BU 25 and it has all of it's specs in German of course. If anyone has a lead on one it would be nice to hear from you. Ken Allen Nuclear Electronics Technologist CancerCare Manitoba Winnipeg, MB ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <725E0331330BD4119A0500062905E2B916496D@beatrice.trcc.org> From: "Hughes, William H." To: "'linac-eng@plato1.aristotle.net'" Subject: Date: Mon, 18 Jun 2001 05:11:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi guys and gals, We here at the Regional Cancer Center are now in the market for a used 2100 with MLC if possible. The time frame for this project would be in the spring of 2002. If any one has plans for the removal of a working unit in this time period we would like to know. Also we might be interested in a simulator at the same time. All replies will be answered. Thank you in advance for your interest and assistance. Bill Hughes Regional Cancer Center 2500 West 12th St. Erie, Pa. 16505 Ph: 814-838-0408 Fax: 814-838-0461 E-mail: whughes@trcc.org Have a nice day!!! ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Electrometers........ Message-ID: <3.0.5.32.20010618085922.00923dd0@pop3.unsw.edu.au> From: Matthew Wellings To: Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Electrometers........ Date: Sun, 17 Jun 2001 14:59:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good Morning, We have also seen this problem at our centre. We use compressed air to blow the metal filings out of the connectors. We keep a bottle of a compressed air with a hose for this purpose in the same room as our meters and chambers. We no longer have trouble with leaky connections. Hope that helps. Matt Wellings At 14:27 15/06/01 +1200, Dave Pinchin wrote: >G'day, >We are having endless trouble with our QA electrometers. Basically the triax plugs are shedding little metal fragments onto the insulated portion of the plugs. > >There are several possible reasons for this and I would like lots of feedback from the world regarding your experiences. > >Our experience is: >1/ The plugs get metal shavings and then become electrically 'leaky' discharging the bias voltage giving erroneous readings. >2/ We do QA on the meters themselves and ion chambers on a monthly basis. >3/ There are never enough meters to go around and meters get moved from machine to machine on a daily basis. >4/ The plugs are triaxial screw type about the size of a standard BNC connector. > >It has become an endless job cleaning the metal filings out of the plugs and sockets and I would love to know how the rest of the world copes. > >Thanks >Dave > > > > >** This email and attachments have been scanned for content and viruses >and is believed to be clean ** > >This email or attachments may contain confidential or legally >privileged information intended for the sole use of the addressee(s). >Any use, redistribution, disclosure, or reproduction of this message, >except as intended, is prohibited. If you received this email in error, >please notify the sender and remove all copies of the message, >including any attachments. Any views or opinions expressed in this >email (unless otherwise stated) may not represent those of Canterbury >District Health Board. > **************************************************************************** **************************************************************************** ********************** This email and the files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended recipient, you are not permitted to distribute or use this message or any of its attachments in any way. We also request that you advise the sender of the incorrect addressing. This note also confirms that this email message has been virus scanned and although no computer viruses were detected, South East Health accepts no liability for any consequential damage resulting from email containing any computer viruses. **************************************************************************** **************************************************************************** ********************* ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Electrometers........ Message-ID: <32BB029387A6D4118C7F00C00D004331143070@MBPCC_EXCHANGE> From: "Hidalgo, Dr Oscar" To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Electrometers........ Date: Fri, 15 Jun 2001 07:33:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, what kind of electrometers do you have? Oscar Hidalgo -----Original Message----- From: Dave Pinchin [SMTP:Dave.Pinchin@cdhb.govt.nz] Sent: Thursday, June 14, 2001 9:27 PM To: linac-eng@plato1.aristotle.net Subject: Electrometers........ G'day, We are having endless trouble with our QA electrometers. Basically the triax plugs are shedding little metal fragments onto the insulated portion of the plugs. There are several possible reasons for this and I would like lots of feedback from the world regarding your experiences. Our experience is: 1/ The plugs get metal shavings and then become electrically 'leaky' discharging the bias voltage giving erroneous readings. 2/ We do QA on the meters themselves and ion chambers on a monthly basis. 3/ There are never enough meters to go around and meters get moved from machine to machine on a daily basis. 4/ The plugs are triaxial screw type about the size of a standard BNC connector. It has become an endless job cleaning the metal filings out of the plugs and sockets and I would love to know how the rest of the world copes. Thanks Dave ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: klystron perveance Message-ID: <9C688FB52A05D51194750002B325B5F714F7FF@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: "'Mlaa@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: klystron perveance Date: Fri, 15 Jun 2001 03:31:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Some of the formulae are difficult to type so email me if anything is unclear. Russ Connect a 25 foot RG58 coax to klystron voltage monitor jack J2 on pulse transformer A7 Set scope for ext. trig Connect short coax from console sync BNC to trigger in. Program Low X Beam on Record amplitude and pulse width. Repeat above steps with 25ft. cable on jack J1 on pulse transformer. Record actual oil tank temp and current amplitude and pulse width. Oil temp (celcius) = (actual oil temp - 32) * 5/9 Calib. temp (celcius) = (faceplate voltage divider cal. temp - 32) *5/9 Temp correction = (oil temp - cal. temp) * 0.1%/C (that is 1% per degree C) KlyV = scope voltage * divider ratio * temp corr. KlyI = waveform amplitude / nameplate cal factor Perveance = I / E to the power of 3/2 Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 -----Original Message----- From: Mlaa@aol.com [mailto:Mlaa@aol.com] Sent: 15 June, 2001 4:17 AM To: linac-eng@plato1.aristotle.net Subject: klystron perveance Hi to all on the list. I was wondering if anyone out there has the formula notes for klystron perveance on a Varian machine. I was also wondering if it is possible to adjust the klystron solenoid power supply, much like you would do with the RF driver for saturation, as it does yield a little more forward power? Is this a viable possibility? Thanks in advance Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: klystron perveance Message-ID: <003901c0f597$2337a510$6401a8c0@accelinear> From: MARTIN SHAPIRO To: Mlaa@aol.com, linac-eng@plato1.aristotle.net Subject: RE: klystron perveance Date: Fri, 15 Jun 2001 04:31:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, In a properly operating klystron a small adjustment of the kly sol current (1-2 amps) should have little noticable effect in output. Major warning here - the kly sol field strength can be critical for tube operation and running a tube out of spec may cause instantaneous and catastrophic damage. This type of damage can render a tube unusable even as a core. I would suspect that if you noted an increase in forward power by adjusting kly sol I from nameplate that the tube is failing. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Mlaa@aol.com Sent: Friday, June 15, 2001 4:17 AM To: linac-eng@plato1.aristotle.net Subject: klystron perveance Hi to all on the list. I was wondering if anyone out there has the formula notes for klystron perveance on a Varian machine. I was also wondering if it is possible to adjust the klystron solenoid power supply, much like you would do with the RF driver for saturation, as it does yield a little more forward power? Is this a viable possibility? Thanks in advance Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Electrometers........ Message-ID: <3B2A0C2D.4E7882E4@yale.edu> From: "Peter E. Vitali" To: Dave Pinchin Cc: linac-eng@plato1.aristotle.net, "Medical Physics, Listserver" Subject: Re: Electrometers........ Date: Fri, 15 Jun 2001 05:23:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Morning All: When did the triax connector change from BNC type to the TNC screw on type? Recently I had to convert from the TNC to the BNC type on a new ion chamber. The vendor, Elekta, stated that the TNC was the default connector from them and that if you wanted any other type you had to specify it. Is it a European standard? Our Standard Radiation Measurement Instrumentation at our institution is manufactured by Keithley a member of the Invoision Company. All our electrometers came with Triax BNC 2 lug type. Looking at their catalog I see they offer a version of their model 35040 Advanced Therapy Dosimeter in two versions, one with Triax BNC Connectors and one with Triax TNC connectors. There is also a Triax BNC 3 type in the Trompeter Coax/Triax Connector Catalog but I have never seen them on any Standard Radiation Measurement Instrumentation. With the Triax BNC type of connector we have never had this problem. We usually end up with broken shield wires in the cable at the connector as our major source of problem. If the connector got dirty internally it was because some one left the cap off when it wasn't in use and dirt or dust got in. Usually I would clean them out with 99% alcohol and or electronic cleaner that leaves no residue. Then blow them out with canned air. Looks like we are going to have to be careful when ordering new equipment to make sure we specify the type of connector we want. Dave Pinchin wrote: > G'day, > We are having endless trouble with our QA electrometers. Basically the triax plugs are shedding little metal fragments onto the insulated portion of the plugs. > > There are several possible reasons for this and I would like lots of feedback from the world regarding your experiences. > > Our experience is: > 1/ The plugs get metal shavings and then become electrically 'leaky' discharging the bias voltage giving erroneous readings. > 2/ We do QA on the meters themselves and ion chambers on a monthly basis. > 3/ There are never enough meters to go around and meters get moved from machine to machine on a daily basis. > 4/ The plugs are triaxial screw type about the size of a standard BNC connector. > > It has become an endless job cleaning the metal filings out of the plugs and sockets and I would love to know how the rest of the world copes. > > Thanks > Dave > > ** This email and attachments have been scanned for content and viruses > and is believed to be clean ** > > This email or attachments may contain confidential or legally > privileged information intended for the sole use of the addressee(s). > Any use, redistribution, disclosure, or reproduction of this message, > except as intended, is prohibited. If you received this email in error, > please notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed in this > email (unless otherwise stated) may not represent those of Canterbury > District Health Board. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Electrometers........ Message-ID: From: "Urmanita, Ted" To: 'Dave Pinchin' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: Electrometers........ Date: Fri, 15 Jun 2001 06:10:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dave, These metal shavings you are seeing are coming from the shield cable itself and compressed by the triax connector. In time, (through number of usage,reattaching of cable) these fragments develops and weakens the conductivity of the shield until it will eventually remained open. I usually repair them by cutting the cable and reattach the triax connector.Female connector gets broken most often especially the contact tip, so I just replace them. I hope this help, Dave. Ted Urmanita UCLA -----Original Message----- From: Dave Pinchin [mailto:Dave.Pinchin@cdhb.govt.nz] Sent: Thursday, June 14, 2001 7:27 PM To: linac-eng@plato1.aristotle.net Subject: Electrometers........ G'day, We are having endless trouble with our QA electrometers. Basically the triax plugs are shedding little metal fragments onto the insulated portion of the plugs. There are several possible reasons for this and I would like lots of feedback from the world regarding your experiences. Our experience is: 1/ The plugs get metal shavings and then become electrically 'leaky' discharging the bias voltage giving erroneous readings. 2/ We do QA on the meters themselves and ion chambers on a monthly basis. 3/ There are never enough meters to go around and meters get moved from machine to machine on a daily basis. 4/ The plugs are triaxial screw type about the size of a standard BNC connector. It has become an endless job cleaning the metal filings out of the plugs and sockets and I would love to know how the rest of the world copes. Thanks Dave ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: BrainLab mmlc Message-ID: <3B2A1C7D.F46575CD@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: BrainLab mmlc Date: Fri, 15 Jun 2001 06:32:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could anyone advise the control resolution of BrainLab mmlc 's leaf motor in terms of counts per mm? We have both Varian Mk series MLC and BrainLab's mmlc installed on 600CD. They have the same workstation and controller software version. It seems the Mk series can produce an appreciable better stripe image on x-ray film. Could anyone kindly comment this issue? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: klystron perveance Message-ID: <11c.540064.285b1e85@aol.com> From: Mlaa@aol.com To: linac-eng@plato1.aristotle.net Subject: klystron perveance Date: Fri, 15 Jun 2001 00:17:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi to all on the list. I was wondering if anyone out there has the formula notes for klystron perveance on a Varian machine. I was also wondering if it is possible to adjust the klystron solenoid power supply, much like you would do with the RF driver for saturation, as it does yield a little more forward power? Is this a viable possibility? Thanks in advance Mike Liddicote Accelerator Associates ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Electrometers........ Message-ID: <01Jun15.074137bst.49@firewall1.ccotrust.co.uk> From: Richard Clements To: "'linac-eng@plato1.aristotle.net'" Subject: RE: Electrometers........ Date: Thu, 14 Jun 2001 23:13:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have had exactly the same problems. The materials used in the newer connectors appear to be a variety of alloys which are much more prone to shedding small fragments than the older connectors. In addition, the newer meters are far less tolerant of leaky connections. This is ultimately a good thing as it forces you to keep to you connectors in good condition, but it is rather inconvenient when the meter refuses to work. We have ended up dedicating a dosemeter to each of our treatment units so that we rarely need to remake the connections. We have a second cable for a weekly check with a second instrument. I have also got into the habit of tapping the cable connector in the bench before connecting and after disconnecting. It is amazing how much metallic dust comes out. I also visually inspect the connector on the meter. If I can see any metallic dust I dry wipe it with a tissue. This only removes external dust, but may help prevent subsequent contamination inside the connector. Our cables now rarely become contaminated. If they do, they are replaced with a good spare and cleaned in alcohol. This can take several attempts and needs plenty of time to dry out. Richard Clements Clatterbridge Centre for Oncology Bebington Wirral Merseyside. CH63 4JY Tel: (+44) 151 334 1155 ext 4168 Fax: (+44) 151 482 7860 > -----Original Message----- > From: Dave Pinchin [SMTP:Dave.Pinchin@cdhb.govt.nz] > Sent: Friday, June 15, 2001 3:27 AM > To: linac-eng@plato1.aristotle.net > Subject: Electrometers........ > > G'day, > We are having endless trouble with our QA electrometers. Basically the > triax plugs are shedding little metal fragments onto the insulated portion > of the plugs. > > There are several possible reasons for this and I would like lots of > feedback from the world regarding your experiences. > > Our experience is: > 1/ The plugs get metal shavings and then become electrically 'leaky' > discharging the bias voltage giving erroneous readings. > 2/ We do QA on the meters themselves and ion chambers on a monthly basis. > 3/ There are never enough meters to go around and meters get moved from > machine to machine on a daily basis. > 4/ The plugs are triaxial screw type about the size of a standard BNC > connector. > > It has become an endless job cleaning the metal filings out of the plugs > and sockets and I would love to know how the rest of the world copes. > > Thanks > Dave > > > > > ** This email and attachments have been scanned for content and viruses > and is believed to be clean ** > > This email or attachments may contain confidential or legally > privileged information intended for the sole use of the addressee(s). > Any use, redistribution, disclosure, or reproduction of this message, > except as intended, is prohibited. If you received this email in error, > please notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed in this > email (unless otherwise stated) may not represent those of Canterbury > District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Electrometers........ Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Electrometers........ Date: Thu, 14 Jun 2001 18:27:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, We are having endless trouble with our QA electrometers. Basically the triax plugs are shedding little metal fragments onto the insulated portion of the plugs. There are several possible reasons for this and I would like lots of feedback from the world regarding your experiences. Our experience is: 1/ The plugs get metal shavings and then become electrically 'leaky' discharging the bias voltage giving erroneous readings. 2/ We do QA on the meters themselves and ion chambers on a monthly basis. 3/ There are never enough meters to go around and meters get moved from machine to machine on a daily basis. 4/ The plugs are triaxial screw type about the size of a standard BNC connector. It has become an endless job cleaning the metal filings out of the plugs and sockets and I would love to know how the rest of the world copes. Thanks Dave ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600CD immediate yield interlock Message-ID: <86256A6C.000062F1.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: tcullen@wfubmc.edu Cc: "Maddox, Buford J" , 'Andrew Frolov' , "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" Subject: Re: 600CD immediate yield interlock Date: Thu, 14 Jun 2001 16:02:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I did not notice if this has already been mentioned in this thread, but I have seen instances where the opamp on the "meters" board will go bad (apparently after an episode of arcing) and cause YLD action problems pretty quickly. It will also render the servo very difficult to align. This would be U15 on the Meter Interface PCB B6 in the Signal Conditioning Rack. This amp is in parallel with the target I input to the yield servo and can imbalance the circuit, causing all kinds of havoc. Best Wishes. Tim Waldron tcullen@wfubmc.edu (Tim Cullen) on 06/14/2001 11:16:06 AM To: "Maddox, Buford J" cc: "'Andrew Frolov'" , "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" (bcc: Timothy J. Waldron/MDACC) Subject: Re: 600CD immediate yield interlock Kim, I had an instance on a [600C s/n 042 ver 5.4] where the target current was being dropped out or trashed severely at certain gantry angles and this would give the YLD I/L almost immediately. I found the cable problem was on the gantry patch panel where this signal passes thru. Tim Cullen "Maddox, Buford J" wrote: > The reflected power change could indicate an AFC problem, or a beam loading > change. 6x has rather high beam loading, which is evident from the fact that > pfn has to be repeaked after small gun changes. I would monitor the afc error > by subtracting the A and B signals on a scope. I would check this with and > without the gun (shift the timing with gun delay), as the AFC is also affected > by beam loading in 6x, due to a slight resonant frequency shift which depends on > the beam I. The standard test of the yield fault interlock is to detune the > AFC. > > My guns usually run around 5.3v. Is yours old, is that where the knee is? > > TX for the detailed post, very helpful to see the details. > > Jerry > > -----Original Message----- > > From: Andrew Frolov [SMTP:Afrolov@mail.rah.sa.gov.au] > > Sent: Tuesday, June 12, 2001 11:33 PM > > To: ''Linac-Eng@plato1.aristotle.net' '; kimyeung@ultraline > > Subject: Re: 600CD immediate yield interlock > > > > Date sent: Tue, 12 Jun 2001 22:17:16 +0800 > > From: "kimyeung@ultraline" > > To: "''Linac-Eng@plato1.aristotle.net' '" > > > > Subject: Re: 600CD immediate yield interlock > > > > > Hi Colleagues, > > > > > > I have experienced several incidents of immediate yield interlocks after > > > beam on on one of our 600CD, version 5.4.. The 2 second interlock > > > inhibition did not function and no faults were found on the yield servo > > > pcb. > > > > > > Could anyone advise what are the possible causes for the immediate yield > > > interlock on our 600CD? > > > > > > Thanks in advance. > > > > > > Kim Yeung > > > > > > > We had a problem when interlock happened shortly after 2 sec delay, > > but not immediately. It was due to insufficient voltage on Gun > > filament. We have also noticed during trouble shooting that only in > > service mode every second time the interlock occurred immediately > > after beaming on. It was not a fault but rather a strange sequence of > > resetting the i/l circuit (particularly 2 sec inhibit circuit) in > > service mode after a genuine yield i/l. It was confusing until we > > realized that it is normal operation. Then we continued the > > troubleshooting in the right direction. Here is a copy of report from > > our database: > > > > The yield servo and I/L circuit has beam checked. No problem found. > > As the interlock always happened shortly after beam-on, few waveforms > > were captured at the moment when yield servo takes control. Compared > > with the normal run waveforms noticed that: 1. Target I was 20% > > lover. 2.Reflected power - 40% higher. 3. Yield servo drove Mag I to > > low extreme. Theoretically this combination could only be due to > > insufficient electron emission. Checked gun filament voltage. Found > > it was dropping during the day from 6.76 to 6.66V and probably > > further down with the covers on. Although at this point the fault did > > not occur, the Yield servo worked harder and waveforms tended to > > change accordingly. Further manual reduction of GFIL by 0.15V > > simulated the fault. Also noticed that originally GFIL was set by > > Varian at 6.8V. These findings were reported to Varian along with > > suggestion to increase GFIL to 6.85V and therefore to compensate for > > the voltage fluctuation below the Shottki knee. Varian agreed. > > > > Hope this will help. > > > > > > Andrew Frolov > > Manager, Radiation Engineering > > Medical Physics > > Royal Adelaide Hospital > > > > Tel: 61 8 8222 5674 > > Fax: 61 8 8222 5937 > > > > email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: From: "Turner, Guy" To: "'tcullen@wfubmc.edu'" , David Burgess Cc: Linac-eng@plato1.aristotle.net Subject: RE: Varian 2100C2 Service Mode "TDRV" Problem Date: Thu, 14 Jun 2001 10:09:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Boy does all this sound familiar. I have had to do the same thing many times myself. Thank goodness the people at Tech Ops are still customer oriented (Thank you Richard and Vaughn) and will give you the information you need. Otherwise you, and especially the patients, would be sunk. I don't know whether it is the result of making the mistake of running your service department as a profit center or whether it is just the effects of the pace of changing technology or both, but Varian has been on a steady march of becoming less and less able to take care of their customers needs for some time now. The guys in the field are still very good and really want to help, but they are in the same boat we are - can't get any info!! It's certainly not like in the "old days" anymore.....you could'nt beat Varian for their hands-on customer focused approach. -----Original Message----- From: tcullen@wfubmc.edu [mailto:tcullen@wfubmc.edu] Sent: Thursday, June 14, 2001 10:34 AM To: David Burgess Cc: Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem It would be a good thing for the vendors to have their employees who are far removed from the clinical oncology arena to encourage them to volunteer in a cancer center to see first hand what goes on. It can be very sobering. To continue the saga from last evening. I called my Varian regional office at 9:30AM (gave them time to get their coffee) to request the RF rotary joint parts breakdown. I asked the receptionist for someone to give technical assistance. She says let me get you someone and the comes back on to say I'll have to put you over to service request to let them get me in touch with a service rep. I say ok and at the same time shake my head. Service request gets on the phone and I tell her what I need regarding the parts breakdown. Well she tells me there is nobody in the building who can give technical info (this office covers the whole SE region of the US and nobody's home to help with a part number?) and she is going to have to page a service rep to give me the info. Wait for call. Wait for call. Wait for call. Around 10 AM get the call. Service rep is a nice guy and tells me something to try, which I already had done last evening. Oh well, he'll have to call PSE to get the part numbers I tried to get from them last evening at 8 PM. Does this look like a vicious circle or what? Well to make this short as possible it's 11:30 AM and I got impatient so I called the ladies at Technical Options earlier. They are the ones you need to call if you have a situation such as this. It took them seconds to give me the P/N info I have been waiting and still waiting to get from Varian since last night. Thank you again. Tim Cullen David Burgess wrote: > Well said Tim, it is that Varian attitude that's the problem. > I've experienced the same thing,PSE won't talk to me and my regional office is 1500 miles away and the one person there is often out on a call. The one salvation is that some day even the Varian guys will be Cancer Patients. Maybe then they'll get a vision. > > David Burgess > Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600CD immediate yield interlock Message-ID: <3B28E346.F9564E9@wfubmc.edu> From: tcullen@wfubmc.edu To: "Maddox, Buford J" Cc: 'Andrew Frolov' , "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" Subject: Re: 600CD immediate yield interlock Date: Thu, 14 Jun 2001 08:16:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kim, I had an instance on a [600C s/n 042 ver 5.4] where the target current was being dropped out or trashed severely at certain gantry angles and this would give the YLD I/L almost immediately. I found the cable problem was on the gantry patch panel where this signal passes thru. Tim Cullen "Maddox, Buford J" wrote: > The reflected power change could indicate an AFC problem, or a beam loading > change. 6x has rather high beam loading, which is evident from the fact that > pfn has to be repeaked after small gun changes. I would monitor the afc error > by subtracting the A and B signals on a scope. I would check this with and > without the gun (shift the timing with gun delay), as the AFC is also affected > by beam loading in 6x, due to a slight resonant frequency shift which depends on > the beam I. The standard test of the yield fault interlock is to detune the > AFC. > > My guns usually run around 5.3v. Is yours old, is that where the knee is? > > TX for the detailed post, very helpful to see the details. > > Jerry > > -----Original Message----- > > From: Andrew Frolov [SMTP:Afrolov@mail.rah.sa.gov.au] > > Sent: Tuesday, June 12, 2001 11:33 PM > > To: ''Linac-Eng@plato1.aristotle.net' '; kimyeung@ultraline > > Subject: Re: 600CD immediate yield interlock > > > > Date sent: Tue, 12 Jun 2001 22:17:16 +0800 > > From: "kimyeung@ultraline" > > To: "''Linac-Eng@plato1.aristotle.net' '" > > > > Subject: Re: 600CD immediate yield interlock > > > > > Hi Colleagues, > > > > > > I have experienced several incidents of immediate yield interlocks after > > > beam on on one of our 600CD, version 5.4.. The 2 second interlock > > > inhibition did not function and no faults were found on the yield servo > > > pcb. > > > > > > Could anyone advise what are the possible causes for the immediate yield > > > interlock on our 600CD? > > > > > > Thanks in advance. > > > > > > Kim Yeung > > > > > > > We had a problem when interlock happened shortly after 2 sec delay, > > but not immediately. It was due to insufficient voltage on Gun > > filament. We have also noticed during trouble shooting that only in > > service mode every second time the interlock occurred immediately > > after beaming on. It was not a fault but rather a strange sequence of > > resetting the i/l circuit (particularly 2 sec inhibit circuit) in > > service mode after a genuine yield i/l. It was confusing until we > > realized that it is normal operation. Then we continued the > > troubleshooting in the right direction. Here is a copy of report from > > our database: > > > > The yield servo and I/L circuit has beam checked. No problem found. > > As the interlock always happened shortly after beam-on, few waveforms > > were captured at the moment when yield servo takes control. Compared > > with the normal run waveforms noticed that: 1. Target I was 20% > > lover. 2.Reflected power - 40% higher. 3. Yield servo drove Mag I to > > low extreme. Theoretically this combination could only be due to > > insufficient electron emission. Checked gun filament voltage. Found > > it was dropping during the day from 6.76 to 6.66V and probably > > further down with the covers on. Although at this point the fault did > > not occur, the Yield servo worked harder and waveforms tended to > > change accordingly. Further manual reduction of GFIL by 0.15V > > simulated the fault. Also noticed that originally GFIL was set by > > Varian at 6.8V. These findings were reported to Varian along with > > suggestion to increase GFIL to 6.85V and therefore to compensate for > > the voltage fluctuation below the Shottki knee. Varian agreed. > > > > Hope this will help. > > > > > > Andrew Frolov > > Manager, Radiation Engineering > > Medical Physics > > Royal Adelaide Hospital > > > > Tel: 61 8 8222 5674 > > Fax: 61 8 8222 5937 > > > > email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600CD immediate yield interlock Message-ID: From: "Turner, Guy" To: "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" Subject: RE: 600CD immediate yield interlock Date: Thu, 14 Jun 2001 07:40:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The "immediate" part of the problem catches my eye. As was mentioned in the original post, you usually have a couple of seconds to observe what is happening with the output before a yield shows up. I have had past occurrences where an arcing pulse cable in the wind-up area has caused immediate Yield faults (among others). All of these incidents were with a non-C 6/100, however. Low energy C-series are a fairly new beast to me, so I don't know how significantly that changes things. Guy Turner Radiation Oncology Information Systems "Any Enterprise When fairly once begun Should not be left Until all that ought is won" > NOTICE: (1) The foregoing is not intended to be a legally binding or legally effective electronic signature. (2) This message may contain legally privileged information. If you are not the intended recipient of this message, please notify me, disregard the foregoing message, and delete the message immediately. I apologize for any inconvenience this may have caused. > > -----Original Message----- From: Maddox, Buford J [mailto:JMADDOX@LROC.HARVARD.EDU] Sent: Thursday, June 14, 2001 8:51 AM To: 'Andrew Frolov'; ''Linac-Eng@plato1.aristotle.net' '; kimyeung@ultraline Subject: RE: 600CD immediate yield interlock The reflected power change could indicate an AFC problem, or a beam loading change. 6x has rather high beam loading, which is evident from the fact that pfn has to be repeaked after small gun changes. I would monitor the afc error by subtracting the A and B signals on a scope. I would check this with and without the gun (shift the timing with gun delay), as the AFC is also affected by beam loading in 6x, due to a slight resonant frequency shift which depends on the beam I. The standard test of the yield fault interlock is to detune the AFC. My guns usually run around 5.3v. Is yours old, is that where the knee is? TX for the detailed post, very helpful to see the details. Jerry > -----Original Message----- > From: Andrew Frolov [SMTP:Afrolov@mail.rah.sa.gov.au] > Sent: Tuesday, June 12, 2001 11:33 PM > To: ''Linac-Eng@plato1.aristotle.net' '; kimyeung@ultraline > Subject: Re: 600CD immediate yield interlock > > Date sent: Tue, 12 Jun 2001 22:17:16 +0800 > From: "kimyeung@ultraline" > To: "''Linac-Eng@plato1.aristotle.net' '" > > Subject: Re: 600CD immediate yield interlock > > > Hi Colleagues, > > > > I have experienced several incidents of immediate yield interlocks after > > beam on on one of our 600CD, version 5.4.. The 2 second interlock > > inhibition did not function and no faults were found on the yield servo > > pcb. > > > > Could anyone advise what are the possible causes for the immediate yield > > interlock on our 600CD? > > > > Thanks in advance. > > > > Kim Yeung > > > > We had a problem when interlock happened shortly after 2 sec delay, > but not immediately. It was due to insufficient voltage on Gun > filament. We have also noticed during trouble shooting that only in > service mode every second time the interlock occurred immediately > after beaming on. It was not a fault but rather a strange sequence of > resetting the i/l circuit (particularly 2 sec inhibit circuit) in > service mode after a genuine yield i/l. It was confusing until we > realized that it is normal operation. Then we continued the > troubleshooting in the right direction. Here is a copy of report from > our database: > > The yield servo and I/L circuit has beam checked. No problem found. > As the interlock always happened shortly after beam-on, few waveforms > were captured at the moment when yield servo takes control. Compared > with the normal run waveforms noticed that: 1. Target I was 20% > lover. 2.Reflected power - 40% higher. 3. Yield servo drove Mag I to > low extreme. Theoretically this combination could only be due to > insufficient electron emission. Checked gun filament voltage. Found > it was dropping during the day from 6.76 to 6.66V and probably > further down with the covers on. Although at this point the fault did > not occur, the Yield servo worked harder and waveforms tended to > change accordingly. Further manual reduction of GFIL by 0.15V > simulated the fault. Also noticed that originally GFIL was set by > Varian at 6.8V. These findings were reported to Varian along with > suggestion to increase GFIL to 6.85V and therefore to compensate for > the voltage fluctuation below the Shottki knee. Varian agreed. > > Hope this will help. > > > Andrew Frolov > Manager, Radiation Engineering > Medical Physics > Royal Adelaide Hospital > > Tel: 61 8 8222 5674 > Fax: 61 8 8222 5937 > > email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: <3B28D96C.56CDD5C9@wfubmc.edu> From: tcullen@wfubmc.edu To: David Burgess Cc: Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Thu, 14 Jun 2001 07:34:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It would be a good thing for the vendors to have their employees who are far removed from the clinical oncology arena to encourage them to volunteer in a cancer center to see first hand what goes on. It can be very sobering. To continue the saga from last evening. I called my Varian regional office at 9:30AM (gave them time to get their coffee) to request the RF rotary joint parts breakdown. I asked the receptionist for someone to give technical assistance. She says let me get you someone and the comes back on to say I'll have to put you over to service request to let them get me in touch with a service rep. I say ok and at the same time shake my head. Service request gets on the phone and I tell her what I need regarding the parts breakdown. Well she tells me there is nobody in the building who can give technical info (this office covers the whole SE region of the US and nobody's home to help with a part number?) and she is going to have to page a service rep to give me the info. Wait for call. Wait for call. Wait for call. Around 10 AM get the call. Service rep is a nice guy and tells me something to try, which I already had done last evening. Oh well, he'll have to call PSE to get the part numbers I tried to get from them last evening at 8 PM. Does this look like a vicious circle or what? Well to make this short as possible it's 11:30 AM and I got impatient so I called the ladies at Technical Options earlier. They are the ones you need to call if you have a situation such as this. It took them seconds to give me the P/N info I have been waiting and still waiting to get from Varian since last night. Thank you again. Tim Cullen David Burgess wrote: > Well said Tim, it is that Varian attitude that's the problem. > I've experienced the same thing,PSE won't talk to me and my regional office is 1500 miles away and the one person there is often out on a call. The one salvation is that some day even the Varian guys will be Cancer Patients. Maybe then they'll get a vision. > > David Burgess > Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600CD immediate yield interlock Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF9B5@phsexch6.partners.org> From: "Maddox, Buford J" To: 'Andrew Frolov' , "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" Subject: RE: 600CD immediate yield interlock Date: Thu, 14 Jun 2001 05:51:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The reflected power change could indicate an AFC problem, or a beam loading change. 6x has rather high beam loading, which is evident from the fact that pfn has to be repeaked after small gun changes. I would monitor the afc error by subtracting the A and B signals on a scope. I would check this with and without the gun (shift the timing with gun delay), as the AFC is also affected by beam loading in 6x, due to a slight resonant frequency shift which depends on the beam I. The standard test of the yield fault interlock is to detune the AFC. My guns usually run around 5.3v. Is yours old, is that where the knee is? TX for the detailed post, very helpful to see the details. Jerry > -----Original Message----- > From: Andrew Frolov [SMTP:Afrolov@mail.rah.sa.gov.au] > Sent: Tuesday, June 12, 2001 11:33 PM > To: ''Linac-Eng@plato1.aristotle.net' '; kimyeung@ultraline > Subject: Re: 600CD immediate yield interlock > > Date sent: Tue, 12 Jun 2001 22:17:16 +0800 > From: "kimyeung@ultraline" > To: "''Linac-Eng@plato1.aristotle.net' '" > > Subject: Re: 600CD immediate yield interlock > > > Hi Colleagues, > > > > I have experienced several incidents of immediate yield interlocks after > > beam on on one of our 600CD, version 5.4.. The 2 second interlock > > inhibition did not function and no faults were found on the yield servo > > pcb. > > > > Could anyone advise what are the possible causes for the immediate yield > > interlock on our 600CD? > > > > Thanks in advance. > > > > Kim Yeung > > > > We had a problem when interlock happened shortly after 2 sec delay, > but not immediately. It was due to insufficient voltage on Gun > filament. We have also noticed during trouble shooting that only in > service mode every second time the interlock occurred immediately > after beaming on. It was not a fault but rather a strange sequence of > resetting the i/l circuit (particularly 2 sec inhibit circuit) in > service mode after a genuine yield i/l. It was confusing until we > realized that it is normal operation. Then we continued the > troubleshooting in the right direction. Here is a copy of report from > our database: > > The yield servo and I/L circuit has beam checked. No problem found. > As the interlock always happened shortly after beam-on, few waveforms > were captured at the moment when yield servo takes control. Compared > with the normal run waveforms noticed that: 1. Target I was 20% > lover. 2.Reflected power - 40% higher. 3. Yield servo drove Mag I to > low extreme. Theoretically this combination could only be due to > insufficient electron emission. Checked gun filament voltage. Found > it was dropping during the day from 6.76 to 6.66V and probably > further down with the covers on. Although at this point the fault did > not occur, the Yield servo worked harder and waveforms tended to > change accordingly. Further manual reduction of GFIL by 0.15V > simulated the fault. Also noticed that originally GFIL was set by > Varian at 6.8V. These findings were reported to Varian along with > suggestion to increase GFIL to 6.85V and therefore to compensate for > the voltage fluctuation below the Shottki knee. Varian agreed. > > Hope this will help. > > > Andrew Frolov > Manager, Radiation Engineering > Medical Physics > Royal Adelaide Hospital > > Tel: 61 8 8222 5674 > Fax: 61 8 8222 5937 > > email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Fwd: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: <3b28b64d.c3d.0@jps.net> From: Baldev Jhita Reply-To: tcullen@wfubmc.edu To: baldev@elekta.com Cc: Linac-eng@plato1.aristotle.net Subject: Fwd: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Thu, 14 Jun 2001 05:04:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ****** Forwarded Message Follows ******* >To: PilotDaveR@cs.com >From: tcullen@wfubmc.edu (Tim Cullen) >Date: Wed, 13 Jun 2001 21:26:01 -0400 > >Dave, I would call the locals first and get the ball rolling, especially if you >still have some warranty time left. It sounds as if this is a C2 machine. I've >been told the newer machines have had some changes in both the gun deck and the >RF system. The latest versions of Varian's SW probably have changes that coincide >with the changes in hardware. From ver 3 to 6 is a pretty good jump. I wouldn't >be surprised if they missed something. > > >On another note, speaking of Varian, I just got off the phone with their parts >people who are having a hard time since they upgraded their SW on their PC's >recently. One got the blue death screen while searching for a RF rotary joint >breakdown for me and even if there was one. She relayed me to another rep which >was very helpful but could not answer my question about the breakdown. Being the >nice person that she is asked if I wanted to speak with someone in PSE (Product >Support Engineering). I said sure (of course I'm thinking this is unbelievable >they are actually going to let me talk to the almighty PSE, was there a policy >change?). Well once at the PSE reception I was asked who to speak with. I told >her either of the Burton brothers would be fine...none present. I said well >anyone would do I just want a parts breakdown of an RF rotary joint and it's 8 PM >here. She gets off and I can tell she is literally going back and forth with one >of the guys there which is telling her he's not going to talk to me because I'm >not a Varian rep and I need to call my regional office. Well that I would do if >it was not 8 PM and all. Look I was transferred to them only to get the brush >off. What kind of deal is this? Now remember I only want a parts breakdown of the >RF rotary joint. So I go back to parts and the rep proceeds to tell me how sorry >she was they could not help me. Nice people those parts reps. What kind of >company doesn't want to assist their long time customers needing help at 8 PM? >Especially customers responsible for having the linacs up and running in the >morning to treat patients. That is what this is all about isn't it...the >patients. I wonder why they can't get a grip on that at these big corporations? >You know helping their own service guys is fine and all but the last time I >looked they were not the ones buying the equipment. >Tim Cullen > > > >PilotDaveR@cs.com wrote: > >> Hello Fellow Engineers, >> I have an interesting problem which I believe it is software related. >> >> Model: Varian 2100C manuf. 1992 w/ recently installed Mark 4 80 leaf MLC >> Software Ver. 6.0.09 or 6.01 >> This machine ran with Ver. 3.6.4 software prior to the MLC upgrade. >> Problem: >> Prior to the upgrade with Ver. 3.6.4 console software, while performing >> PMI's, I would enter service mode to check or peak PFN and the Gun I for each >> energy if needed. I would disable Dose Rate Servo, Set Gun Motor Pot to "ON" >> then cycle and peak each energy. Since this upgrade, I now cannot leave Gun >> Motor Pot, Active ("ON") if I do, I will get a "TDRV" (T- drive fault) and >> the T- drive will not go to it's proper position for any energy selected. It >> appears that I must set the Gun Motor Pot to "OFF," select the energy I want >> to look at, then if needed, reactivate Gun Motor Pot (ON) to peak GUN I then >> disable this function prior to changing energy. >> Question: >> Is this normal? or did I miss the boat? Is this a software version or >> hardware configuration problem? Is there a method to report this problem to >> Varian? >> Thanks >> David Rodriguez >> email : PilotDaveR@cs.com >> > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: From: David Burgess To: PilotDaveR@cs.com, tcullen@wfubmc.edu Cc: Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Thu, 14 Jun 2001 04:27:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well said Tim, it is that Varian attitude that's the problem. I've experienced the same thing,PSE won't talk to me and my regional office is 1500 miles away and the one person there is often out on a call. The one salvation is that some day even the Varian guys will be Cancer Patients. Maybe then they'll get a vision. David Burgess Nova Scotia Cancer Centre >>> Tim Cullen 6/13/2001 10:26:01 PM >>> Dave, I would call the locals first and get the ball rolling, especially if you still have some warranty time left. It sounds as if this is a C2 machine. I've been told the newer machines have had some changes in both the gun deck and the RF system. The latest versions of Varian's SW probably have changes that coincide with the changes in hardware. From ver 3 to 6 is a pretty good jump. I wouldn't be surprised if they missed something. On another note, speaking of Varian, I just got off the phone with their parts people who are having a hard time since they upgraded their SW on their PC's recently. One got the blue death screen while searching for a RF rotary joint breakdown for me and even if there was one. She relayed me to another rep which was very helpful but could not answer my question about the breakdown. Being the nice person that she is asked if I wanted to speak with someone in PSE (Product Support Engineering). I said sure (of course I'm thinking this is unbelievable they are actually going to let me talk to the almighty PSE, was there a policy change?). Well once at the PSE reception I was asked who to speak with. I told her either of the Burton brothers would be fine...none present. I said well anyone would do I just want a parts breakdown of an RF rotary joint and it's 8 PM here. She gets off and I can tell she is literally going back and forth with one of the guys there which is telling her he's not going to talk to me because I'm not a Varian rep and I need to call my regional office. Well that I would do if it was not 8 PM and all. Look I was transferred to them only to get the brush off. What kind of deal is this? Now remember I only want a parts breakdown of the RF rotary joint. So I go back to parts and the rep proceeds to tell me how sorry she was they could not help me. Nice people those parts reps. What kind of company doesn't want to assist their long time customers needing help at 8 PM? Especially customers responsible for having the linacs up and running in the morning to treat patients. That is what this is all about isn't it...the patients. I wonder why they can't get a grip on that at these big corporations? You know helping their own service guys is fine and all but the last time I looked they were not the ones buying the equipment. Tim Cullen PilotDaveR@cs.com wrote: > Hello Fellow Engineers, > I have an interesting problem which I believe it is software related. > > Model: Varian 2100C manuf. 1992 w/ recently installed Mark 4 80 leaf MLC > Software Ver. 6.0.09 or 6.01 > This machine ran with Ver. 3.6.4 software prior to the MLC upgrade. > Problem: > Prior to the upgrade with Ver. 3.6.4 console software, while performing > PMI's, I would enter service mode to check or peak PFN and the Gun I for each > energy if needed. I would disable Dose Rate Servo, Set Gun Motor Pot to "ON" > then cycle and peak each energy. Since this upgrade, I now cannot leave Gun > Motor Pot, Active ("ON") if I do, I will get a "TDRV" (T- drive fault) and > the T- drive will not go to it's proper position for any energy selected. It > appears that I must set the Gun Motor Pot to "OFF," select the energy I want > to look at, then if needed, reactivate Gun Motor Pot (ON) to peak GUN I then > disable this function prior to changing energy. > Question: > Is this normal? or did I miss the boat? Is this a software version or > hardware configuration problem? Is there a method to report this problem to > Varian? > Thanks > David Rodriguez > email : PilotDaveR@cs.com > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: <3B2812A8.B9D3466B@wfubmc.edu> From: tcullen@wfubmc.edu To: PilotDaveR@cs.com Cc: Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Wed, 13 Jun 2001 17:26:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave, I would call the locals first and get the ball rolling, especially if you still have some warranty time left. It sounds as if this is a C2 machine. I've been told the newer machines have had some changes in both the gun deck and the RF system. The latest versions of Varian's SW probably have changes that coincide with the changes in hardware. From ver 3 to 6 is a pretty good jump. I wouldn't be surprised if they missed something. On another note, speaking of Varian, I just got off the phone with their parts people who are having a hard time since they upgraded their SW on their PC's recently. One got the blue death screen while searching for a RF rotary joint breakdown for me and even if there was one. She relayed me to another rep which was very helpful but could not answer my question about the breakdown. Being the nice person that she is asked if I wanted to speak with someone in PSE (Product Support Engineering). I said sure (of course I'm thinking this is unbelievable they are actually going to let me talk to the almighty PSE, was there a policy change?). Well once at the PSE reception I was asked who to speak with. I told her either of the Burton brothers would be fine...none present. I said well anyone would do I just want a parts breakdown of an RF rotary joint and it's 8 PM here. She gets off and I can tell she is literally going back and forth with one of the guys there which is telling her he's not going to talk to me because I'm not a Varian rep and I need to call my regional office. Well that I would do if it was not 8 PM and all. Look I was transferred to them only to get the brush off. What kind of deal is this? Now remember I only want a parts breakdown of the RF rotary joint. So I go back to parts and the rep proceeds to tell me how sorry she was they could not help me. Nice people those parts reps. What kind of company doesn't want to assist their long time customers needing help at 8 PM? Especially customers responsible for having the linacs up and running in the morning to treat patients. That is what this is all about isn't it...the patients. I wonder why they can't get a grip on that at these big corporations? You know helping their own service guys is fine and all but the last time I looked they were not the ones buying the equipment. Tim Cullen PilotDaveR@cs.com wrote: > Hello Fellow Engineers, > I have an interesting problem which I believe it is software related. > > Model: Varian 2100C manuf. 1992 w/ recently installed Mark 4 80 leaf MLC > Software Ver. 6.0.09 or 6.01 > This machine ran with Ver. 3.6.4 software prior to the MLC upgrade. > Problem: > Prior to the upgrade with Ver. 3.6.4 console software, while performing > PMI's, I would enter service mode to check or peak PFN and the Gun I for each > energy if needed. I would disable Dose Rate Servo, Set Gun Motor Pot to "ON" > then cycle and peak each energy. Since this upgrade, I now cannot leave Gun > Motor Pot, Active ("ON") if I do, I will get a "TDRV" (T- drive fault) and > the T- drive will not go to it's proper position for any energy selected. It > appears that I must set the Gun Motor Pot to "OFF," select the energy I want > to look at, then if needed, reactivate Gun Motor Pot (ON) to peak GUN I then > disable this function prior to changing energy. > Question: > Is this normal? or did I miss the boat? Is this a software version or > hardware configuration problem? Is there a method to report this problem to > Varian? > Thanks > David Rodriguez > email : PilotDaveR@cs.com > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: From: David Burgess To: PilotDaveR@cs.com, Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Wed, 13 Jun 2001 14:58:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi David Perhaps you could ask Peter Vitali. His email in Sept.00 indicates an upgrade was done at his clinic in Sept 00 on a 2100C and a 2100CD. It would be interesting to know if one of those was a T DRV. You were lucky to skip a few versions, 5.4 had a few things and so did 5.2 I recently had to upgrade to the new type stand mother board in 2100CD # 1025. The new board had no configuration info with it for W3 or W4. Same thing happened back in Sept 00 when I got upgraded Serial Comm boards, no config info. Varian insist they are improving. Good luck with it. David Burgess Nova Scotia Cancer Centre >>> 6/13/2001 2:18:07 PM >>> Hello Fellow Engineers, I have an interesting problem which I believe it is software related. Model: Varian 2100C manuf. 1992 w/ recently installed Mark 4 80 leaf MLC Software Ver. 6.0.09 or 6.01 This machine ran with Ver. 3.6.4 software prior to the MLC upgrade. Problem: Prior to the upgrade with Ver. 3.6.4 console software, while performing PMI's, I would enter service mode to check or peak PFN and the Gun I for each energy if needed. I would disable Dose Rate Servo, Set Gun Motor Pot to "ON" then cycle and peak each energy. Since this upgrade, I now cannot leave Gun Motor Pot, Active ("ON") if I do, I will get a "TDRV" (T- drive fault) and the T- drive will not go to it's proper position for any energy selected. It appears that I must set the Gun Motor Pot to "OFF," select the energy I want to look at, then if needed, reactivate Gun Motor Pot (ON) to peak GUN I then disable this function prior to changing energy. Question: Is this normal? or did I miss the boat? Is this a software version or hardware configuration problem? Is there a method to report this problem to Varian? Thanks David Rodriguez email : PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Philips RT50 parts. Message-ID: <86256A6A.0071A3DF.00@notesmta02.allina.com> From: "Jonathan E. Cook" To: linac-eng@plato1.aristotle.net Subject: Philips RT50 parts. Date: Wed, 13 Jun 2001 12:52:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you for getting me the information on the RT50 digital timer. I have found the problem and it appears to be a relay and MOV on the mother board of the timer/counter section. I have found an appropriate MOV but I can't find the relay. It is a Siemens v23016-D0005-A191. The part is probably obsolete and I have not been able to locate it or a cross for it through the usual channels, or over the net. Does anyone have a junker RT50 with a Digital timer that I could by parts off of? I would have to re-engineer the board if I used a different relay, there is a size problem in terms of how it fits in the system. Regulations being what they are I am a little leery of doing that anyway. Thanks in advance ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: <3B27BC3F.A9331BF2@yale.edu> From: "Peter E. Vitali" To: PilotDaveR@cs.com Cc: Linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C2 Service Mode "TDRV" Problem Date: Wed, 13 Jun 2001 11:18:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave: The software version you stated is it for the machine or for the MLC? They normally are different. Why don't you call your local Varian Service Office and ask to speak to the Region Service Manager. If you don't know the number call 1-800-544-7451, Service dispatch, and they will give you the number. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100C2 Service Mode "TDRV" Problem Message-ID: From: PilotDaveR@cs.com To: Linac-eng@plato1.aristotle.net Subject: Varian 2100C2 Service Mode "TDRV" Problem Date: Wed, 13 Jun 2001 09:18:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Fellow Engineers, I have an interesting problem which I believe it is software related. Model: Varian 2100C manuf. 1992 w/ recently installed Mark 4 80 leaf MLC Software Ver. 6.0.09 or 6.01 This machine ran with Ver. 3.6.4 software prior to the MLC upgrade. Problem: Prior to the upgrade with Ver. 3.6.4 console software, while performing PMI's, I would enter service mode to check or peak PFN and the Gun I for each energy if needed. I would disable Dose Rate Servo, Set Gun Motor Pot to "ON" then cycle and peak each energy. Since this upgrade, I now cannot leave Gun Motor Pot, Active ("ON") if I do, I will get a "TDRV" (T- drive fault) and the T- drive will not go to it's proper position for any energy selected. It appears that I must set the Gun Motor Pot to "OFF," select the energy I want to look at, then if needed, reactivate Gun Motor Pot (ON) to peak GUN I then disable this function prior to changing energy. Question: Is this normal? or did I miss the boat? Is this a software version or hardware configuration problem? Is there a method to report this problem to Varian? Thanks David Rodriguez email : PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600CD immediate yield interlock Message-ID: <200106130335.NAA22684@rahsun153.rah.sa.gov.au> From: Andrew Frolov To: "''Linac-Eng@plato1.aristotle.net' '" , "kimyeung@ultraline" Subject: Re: 600CD immediate yield interlock Date: Tue, 12 Jun 2001 19:33:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Date sent: Tue, 12 Jun 2001 22:17:16 +0800 From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: 600CD immediate yield interlock > Hi Colleagues, > > I have experienced several incidents of immediate yield interlocks after > beam on on one of our 600CD, version 5.4.. The 2 second interlock > inhibition did not function and no faults were found on the yield servo > pcb. > > Could anyone advise what are the possible causes for the immediate yield > interlock on our 600CD? > > Thanks in advance. > > Kim Yeung > We had a problem when interlock happened shortly after 2 sec delay, but not immediately. It was due to insufficient voltage on Gun filament. We have also noticed during trouble shooting that only in service mode every second time the interlock occurred immediately after beaming on. It was not a fault but rather a strange sequence of resetting the i/l circuit (particularly 2 sec inhibit circuit) in service mode after a genuine yield i/l. It was confusing until we realized that it is normal operation. Then we continued the troubleshooting in the right direction. Here is a copy of report from our database: The yield servo and I/L circuit has beam checked. No problem found. As the interlock always happened shortly after beam-on, few waveforms were captured at the moment when yield servo takes control. Compared with the normal run waveforms noticed that: 1. Target I was 20% lover. 2.Reflected power - 40% higher. 3. Yield servo drove Mag I to low extreme. Theoretically this combination could only be due to insufficient electron emission. Checked gun filament voltage. Found it was dropping during the day from 6.76 to 6.66V and probably further down with the covers on. Although at this point the fault did not occur, the Yield servo worked harder and waveforms tended to change accordingly. Further manual reduction of GFIL by 0.15V simulated the fault. Also noticed that originally GFIL was set by Varian at 6.8V. These findings were reported to Varian along with suggestion to increase GFIL to 6.85V and therefore to compensate for the voltage fluctuation below the Shottki knee. Varian agreed. Hope this will help. Andrew Frolov Manager, Radiation Engineering Medical Physics Royal Adelaide Hospital Tel: 61 8 8222 5674 Fax: 61 8 8222 5937 email afrolov@mail.rah.sa.gov.au ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600CD immediate yield interlock Message-ID: <3B26246B.E7A1F8B2@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: 600CD immediate yield interlock Date: Tue, 12 Jun 2001 06:17:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, I have experienced several incidents of immediate yield interlocks after beam on on one of our 600CD, version 5.4.. The 2 second interlock inhibition did not function and no faults were found on the yield servo pcb. Could anyone advise what are the possible causes for the immediate yield interlock on our 600CD? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: the next version of the elekta FAQ list Message-ID: From: shane woodall To: Jan Kok , linac-eng@plato1.aristotle.net Subject: Re: the next version of the elekta FAQ list Date: Sun, 12 Aug 2001 04:51:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What is this web site I would like to check it out. ----- Original Message ----- From: "Jan Kok" To: Sent: Monday, June 11, 2001 1:51 PM Subject: the next version of the elekta FAQ list > > Hello accelerator maniacs, > > Although suffering from a serious lack of IT support I managed to > finish the next version of my web-site: > > > Frequently Asked Questions: > Elekta SL25 series Linear Accelerators > and accessories. > > > And specially for those poor colleagues who are not privileged to work > with Elekta machines I included a description on how to build a home > made laser positioning system. We are using this lasers system fore > more than 15 years. This laser system (after the design of J.Schipper) > combines excellent performance with have the cost of a commercial > equivalent. > > > 73 > Cheers Jan > > Jan Kok > Linear Accelerator Engineer > Department of Radiotherapy > University Hospital Utrecht > The Netherlands > > P.S. > Feedback is welcome. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: By golly, here it is! the link to the Elekta FAQ list Message-ID: From: Jan Kok To: bessinc@swb.net Cc: linac-eng@plato1.aristotle.net Subject: Re: By golly, here it is! the link to the Elekta FAQ list Date: Mon, 11 Jun 2001 23:54:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry friends, I could say it was a test but frankly I just forgot to add the link. http://www.isi.uu.nl/radiotherapy/linaceng/linacfaq/FAQ.html You could have used Altavista, searching on: Elekta SL25 My web-site appears at the top (Hi Hi) BTW I was wondering if someone keeps a log of this list. It is not done automatically by majordomo. I could add the log to the FAQ list (if anyone agrees) Jan ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: By golly, I found it! Message-ID: From: Vladimir Holecek To: Linac BB Subject: By golly, I found it! Date: Mon, 11 Jun 2001 21:41:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" http://www.isi.uu.nl/radiotherapy/linaceng/linacfaq/FAQ.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: the next version of the elekta FAQ list Message-ID: From: Jan Kok To: linac-eng@plato1.aristotle.net Subject: the next version of the elekta FAQ list Date: Mon, 11 Jun 2001 09:51:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello accelerator maniacs, Although suffering from a serious lack of IT support I managed to finish the next version of my web-site: Frequently Asked Questions: Elekta SL25 series Linear Accelerators and accessories. And specially for those poor colleagues who are not privileged to work with Elekta machines I included a description on how to build a home made laser positioning system. We are using this lasers system fore more than 15 years. This laser system (after the design of J.Schipper) combines excellent performance with have the cost of a commercial equivalent. 73 Cheers Jan Jan Kok Linear Accelerator Engineer Department of Radiotherapy University Hospital Utrecht The Netherlands P.S. Feedback is welcome. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Xim console keyboard keys Message-ID: <85256A68.0062F03C.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: "Peter E. Vitali" Cc: linac-eng@plato1.aristotle.net Subject: Re: Xim console keyboard keys Date: Mon, 11 Jun 2001 10:00:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks list: The switch is made by SCHURTER, p/n 1241.1055.8.000. The .000 may not be necessary. Newark and Sager carry the switches in North America. Randy ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Discussion - responsibilities ours vs vendors. Message-ID: From: Dave Pinchin To: jsfox@bellatlantic.net, linac-eng@plato1.aristotle.net Subject: RE: Discussion - responsibilities ours vs vendors. Date: Sun, 10 Jun 2001 13:45:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, The response from CMS has been: '1.9.1-p1 should work fine.........' I am currently trying (with no avail) to convince them that encryped passwords is sufficient a reason for them to enhance their product. There are other ways that 2.0.7 is better too. It is more NT savvy and you can buy documentation and setup manuals etc. But again how deeply will they allow me to 'user configure' the system. Never mind... In the words of Tom Paxton. It's only a game, only a game I'm muttering under my breath It's only a game, only a game like dying is only death. :D >>> "John Fox" 10/06/01 13:16:08 >>> Is there anyway CMS would let you install a newer version of SAMBA (I think it is up to 2.06 or 2.07) as this might resolve some of the problems. Are you using a "net use" command on the NT side or are you restoring the connection when logging in. Does it just not map sometimes or does it drop the mapping later? John -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Dave Pinchin Sent: Saturday, June 09, 2001 5:02 PM To: linac-eng@plato1.aristotle.net Subject: Discussion - responsibilities ours vs vendors. G'day, I have been giving some thought over the last while to the following ideas. I have inserted some amusing examples. Firstly - Where my site is coming from. A year or two back there was a situation where some endoscopy equipment was not being cleaned properly. This caused a minor public health scare in the area with lots of publicity and finally the inquiry into the affair showed that the 'manufactureres reccomendations were not being followed'. This has resulted in an amount of paranoia regarding the following of manufacturers instructions as if they were written in stone and given to Moses on the mount. Now we get to some fun bits........ Varian says 'Use NT4 SP3 for VARiS on HP Vectra PCs'. HP says 'Don't use SP3 on our new PCs' ............Oh dear Oh dear Oh dear............ Here's an excert from a marine radar unit from JRC. First-aid treatments. .... 6) Open the victim's mouth and remove the artificial teeth, chewing gum, if any. Keeping the mouth open, stretch the tongue and insert a towel or the like to prevent the tongue from suffocating. (If it is hard to open the mouth with set teeth, open it by a screwdriver and insert a towel). .......... What are my liabilities here...... If I do god's??? bidding and break someones jaw, am I doing the right thing??? Am I clear of litigation???????? If I do accepted modern first aid in preference am I setting myself up????? The actual problem that has prompted this discussion document has been a dificulty in communication between VARiS and CMS Focus treatment planning system VARiS is on NT4 SP3 on it's own subnet (domainname specified by Varian) Focus is on HP9000 Unix boxii with preconfigured Samba (1.9.1-p1) domain name specified by CMS also on it's own subnet. The two systems will not talk reliably. There are 4 or 5 issues which should enhance performance but my hands are somewhat tied as I'm not (quite) at retiring age. In closing I have appended the text of a conversation I had with our 'finger on the (rectal) pulse' department...... enjoy. brrrr-brrrr......brrrr-brrrr...... "Welcome to the computer help desk. All our lines are busy at the moment. If you like you can press 1 and leave a message or if your call is not helpdesk related press 2 to talk to the receptionist." ps If my call was not helpdesk related why was I dialing their number??????? but I digress........ "Hi Gertrude speaking how can I help you???" This name has been changed for .. reasons. " G'day, Dave in Oncology here. I have a problem with a Unix box. Can you assist???" "What is the problem?" "When it boots it reports the DNS service fails. And there is a problem with the 'guest' account setup". "What program are you using????" "UNIX" "How do you spell that?????" .............................................. Dave. :) ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Discussion - responsibilities ours vs vendors. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Discussion - responsibilities ours vs vendors. Date: Sat, 9 Jun 2001 13:02:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, I have been giving some thought over the last while to the following ideas. I have inserted some amusing examples. Firstly - Where my site is coming from. A year or two back there was a situation where some endoscopy equipment was not being cleaned properly. This caused a minor public health scare in the area with lots of publicity and finally the inquiry into the affair showed that the 'manufactureres reccomendations were not being followed'. This has resulted in an amount of paranoia regarding the following of manufacturers instructions as if they were written in stone and given to Moses on the mount. Now we get to some fun bits........ Varian says 'Use NT4 SP3 for VARiS on HP Vectra PCs'. HP says 'Don't use SP3 on our new PCs' ............Oh dear Oh dear Oh dear............ Here's an excert from a marine radar unit from JRC. First-aid treatments. .... 6) Open the victim's mouth and remove the artificial teeth, chewing gum, if any. Keeping the mouth open, stretch the tongue and insert a towel or the like to prevent the tongue from suffocating. (If it is hard to open the mouth with set teeth, open it by a screwdriver and insert a towel). .......... What are my liabilities here...... If I do god's??? bidding and break someones jaw, am I doing the right thing??? Am I clear of litigation???????? If I do accepted modern first aid in preference am I setting myself up????? The actual problem that has prompted this discussion document has been a dificulty in communication between VARiS and CMS Focus treatment planning system VARiS is on NT4 SP3 on it's own subnet (domainname specified by Varian) Focus is on HP9000 Unix boxii with preconfigured Samba (1.9.1-p1) domain name specified by CMS also on it's own subnet. The two systems will not talk reliably. There are 4 or 5 issues which should enhance performance but my hands are somewhat tied as I'm not (quite) at retiring age. In closing I have appended the text of a conversation I had with our 'finger on the (rectal) pulse' department...... enjoy. brrrr-brrrr......brrrr-brrrr...... "Welcome to the computer help desk. All our lines are busy at the moment. If you like you can press 1 and leave a message or if your call is not helpdesk related press 2 to talk to the receptionist." ps If my call was not helpdesk related why was I dialing their number??????? but I digress........ "Hi Gertrude speaking how can I help you???" This name has been changed for .. reasons. " G'day, Dave in Oncology here. I have a problem with a Unix box. Can you assist???" "What is the problem?" "When it boots it reports the DNS service fails. And there is a problem with the 'guest' account setup". "What program are you using????" "UNIX" "How do you spell that?????" .............................................. Dave. :) ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Xim console keyboard keys Message-ID: <3B1FDC45.F82A9BE@yale.edu> From: "Peter E. Vitali" To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Xim console keyboard keys Date: Thu, 7 Jun 2001 11:56:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy: When was your machine installed? What section of the console keyboard needs the switch, the upper (vertical) X-ray Fluoro Control or the lower (horizontal) Machine parameter control. Below is the information on the upper (vertical) X-ray Fluoro control made by Fischer Imaging Corporation. I do not know where the horizontal Machine parameter Control console was produced. The Ximatron SN: 240 initially came with separate X-ray and machine consoles. We converted to the combined console a few years later by adding the upper X-ray control to the machine parameter control console. The switch is listed in the Fischer Imaging Corporation Service Manual for the Varian Ximatron X-ray Console Upgrade 77000G-1, 77000G-3, 77000G-4. P-55576-SM Issue 1, Update A December,1991 The part number for the switch is: Switch mini keyboard 57545. If this unit was designed in the USA the must be various other switch manufacturers that make a switch with the same size and pin out. Try calling Fischer Imaging and see if they will sell you the switches or at least tell you who made them. The only other thing I hope is that the key board we have and the one you have are the same. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Xim console keyboard keys Message-ID: <85256A64.0063B494.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Xim console keyboard keys Date: Thu, 7 Jun 2001 10:09:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has anyone found a supplier for the keys used in the Ximatron dedicated keyboard? The switches have a 'MT' mark on it and a 'S' in an square. These are small switches 0.5" x 0.5" There are 3 terminals 0.1" spacing in a diagonal pattern. I can't think of who MT could be? Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Xim console keyboard keys Message-ID: From: Frank Spitz To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Xim console keyboard keys Date: Thu, 7 Jun 2001 11:59:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" >Randy, I'm not that familiar with the Ximatron keyboard but I'm certain that the trademark S in a square is for "SCHURTER Electric Components" Their web URL is www.schurter.com As a matter of fact I visited their web site and did Product search on the letters MT and got two hits for keyboard switches. MCS2-MTP2 and MCS@-MTP4 Good Luck Frank Spitz Clinical Engineer Thomas Jefferson University > > Has anyone found a supplier for the keys used in the Ximatron dedicated > keyboard? > > The switches have a 'MT' mark on it and a 'S' in an square. These are small > switches 0.5" x 0.5" > There are 3 terminals 0.1" spacing in a diagonal pattern. > > I can't think of who MT could be? > > Randy McVittie > London Regional Cancer Centre > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Xim console keyboard keys Message-ID: <3B1FDC45.F82A9BE@yale.edu> From: "Peter E. Vitali" To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Xim console keyboard keys Date: Thu, 7 Jun 2001 11:56:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy: When was your machine installed? What section of the console keyboard needs the switch, the upper (vertical) X-ray Fluoro Control or the lower (horizontal) Machine parameter control. Below is the information on the upper (vertical) X-ray Fluoro control made by Fischer Imaging Corporation. I do not know where the horizontal Machine parameter Control console was produced. The Ximatron SN: 240 initially came with separate X-ray and machine consoles. We converted to the combined console a few years later by adding the upper X-ray control to the machine parameter control console. The switch is listed in the Fischer Imaging Corporation Service Manual for the Varian Ximatron X-ray Console Upgrade 77000G-1, 77000G-3, 77000G-4. P-55576-SM Issue 1, Update A December,1991 The part number for the switch is: Switch mini keyboard 57545. If this unit was designed in the USA the must be various other switch manufacturers that make a switch with the same size and pin out. Try calling Fischer Imaging and see if they will sell you the switches or at least tell you who made them. The only other thing I hope is that the key board we have and the one you have are the same. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Xim console keyboard keys Message-ID: From: aengstle@gundluth.org To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Xim console keyboard keys Date: Thu, 7 Jun 2001 11:35:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The "S" in a square is a Schurter brand switch. I know Newark carries some Schurter switches but does not list these specifically. I was looking awhile ago for these switches and that was as far as I got before discovering we had some in spares. Maybe Newark can source them from the manufacturer. Alan Engstler Gundersen Lutheran Randy.McVittie@lrcc.on.ca Sent by: To: linac-eng@plato1.aristotle.net owner-linac-eng@plato1.ari cc: stotle.net Subject: Xim console keyboard keys 06/07/01 01:09 PM Has anyone found a supplier for the keys used in the Ximatron dedicated keyboard? The switches have a 'MT' mark on it and a 'S' in an square. These are small switches 0.5" x 0.5" There are 3 terminals 0.1" spacing in a diagonal pattern. I can't think of who MT could be? Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens MD2 Comm. Faults Message-ID: <6CE096D0CDF4D211A3110008C75D075236063E@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Siemens MD2 Comm. Faults Date: Thu, 7 Jun 2001 11:09:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, We have a almost 9 year old Siemens MD-2 running ver. 5.0 software with the latest Impac system attached. Since this machine was new it has had a problem with communications errors. When doing a reset with the key from Treatment mode a communication error (79) will pop up. It never happens when doing a reset from Service mode. This doesn't happen all the time but when it does it gets pretty frustrating. Last night, for example, I had to reset 12 times before the fault stopped coming up. I have, at the suggestion of others, replaced the key and the controller "0" pcb. No change. I feel ignorant here but I am not sure what else to do about this problem. Anyone else had this experience? If so, please pass on your solutions. Thanks In Advance, Dan Watters UMC Tucson, AZ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Xim console keyboard keys Message-ID: <85256A64.0063B494.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Xim console keyboard keys Date: Thu, 7 Jun 2001 10:09:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has anyone found a supplier for the keys used in the Ximatron dedicated keyboard? The switches have a 'MT' mark on it and a 'S' in an square. These are small switches 0.5" x 0.5" There are 3 terminals 0.1" spacing in a diagonal pattern. I can't think of who MT could be? Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Port film graticules Message-ID: <004e01c0ef60$cb025340$6501a8c0@HP> From: Lena S Lamel To: linac-eng@plato1.aristotle.net Subject: Port film graticules Date: Thu, 7 Jun 2001 06:47:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all- I am looking for port film graticules for a Cl 6/100 and Cl 1800. Since both these machines will be put out of service in the next year or so, I would like to get them a cheaply as possible. If anyone has decommissioned either of these machines recently and is no longer using these items, or knows where I might lay my hands on them, please let me know. Thanks in advance-- Lena S Lamel, MS, DABR Summit Medical Center Oakland, CA (510) 869-8888 Lena@lamels.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600CD phase wand replacement Message-ID: <3B1D08E8.8944C62A@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: 600CD phase wand replacement Date: Tue, 5 Jun 2001 08:29:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could anyone advise the tuning procedure of phase wand and line stretcher of Varian 600CD? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: ISO 9000: 2000 in R/T Physics Message-ID: <9D4670F9FFF5D4119BED00508BE22C1D11AFBA@ARTEMIS> From: "Whitlock, Brian" To: "linac eng (E-mail)" Subject: ISO 9000: 2000 in R/T Physics Date: Mon, 4 Jun 2001 02:18:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Has any Radiotherapy Physics department in the UK achieved accreditation to the above standard or other recognised QA system? Rather than reinvent the wheel, we'd be grateful for any information/help/whatever in setting up something similar here at Poole Hospital. Brian Whitlock / Nick Hodgson Radiotherapy Physics Poole Hospital Longfleet Road Poole, Dorset. BH15 2JB Tel 01202 448175 email bwhitlock@poole-tr.swest.nhs.uk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 600CD phase wand replacement problem Message-ID: <3B1A6806.731DADAE@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian 600CD phase wand replacement problem Date: Sun, 3 Jun 2001 08:38:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear colleagues, Does anyone advise the proper procedure for replacing a phase wand on a 600CD? Although we could adjust the phase wand to have a nice drift of reflected power from low to high in both AFC directions, we failed to have a proper rabbit ear on the reflected power. Did I miss something during the phase wand replacement? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 600CD Message-ID: <3B17CDC4.52AF2C6E@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian 600CD Date: Fri, 1 Jun 2001 09:15:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Does anyone know about the details of the frequency programming modification of Varian 600CD? Is it possible to implement the modification by ourselves? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian PV (EPI) Mk 1 interlock connectors Message-ID: From: Craig Pearce To: 'linac eng' Subject: Varian PV (EPI) Mk 1 interlock connectors Date: Thu, 31 May 2001 18:21:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello I would like to get my hands on some of the 2 pin connectors used on the PV cover collision interlock switches. These are made by Berg ( Dupont or FCI ). Any suggestions as to their part numbers and where I can get them from would be must welcome. Regards Craig Pearce Auckland District Health Board ############################################################################ ######### This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal For more information please visit www.marshalsoftware.com ############################################################################ ######### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RS&A Message-ID: <000701c0ea21$400eb560$7b00558b@dad> From: Parts To: mnordin@excite.com Cc: linac-eng@plato1.aristotle.net Subject: RS&A Date: Thu, 31 May 2001 14:29:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Mike, RS&A can be reached at 800-320-4332 Rgds, Randy >>>>>>>>>>> Subj: rs $a Date: 05/31/2001 3:32:49 PM Central Daylight Time From: mnordin@excite.com (mike nordin) Sender: owner-linac-eng@plato1.aristotle.net To: Linac-eng@plato1.aristotle.net I'm looking for a telephone number for service org. RS & A. Thanks, Mike Nordin ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: CCD Camera PAL Message-ID: From: Frank Spitz To: clbartee@hsc.vcu.edu Cc: linac-eng@plato1.aristotle.net Subject: CCD Camera PAL Date: Thu, 31 May 2001 12:49:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, I'm not familiar with the OSD-75 Camera or the exact trac system, however I did find on the web a link to a Color Pal CCD camera model OSD-75. The URL is listed below. The web page lists the camera specs with a e-mail link at the bottom for sales. Maybe if you e-mail them they could direct you to a local distributor. http://www.komoto.com.tw/ehtml/pc_os70.htm Good Luck Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: rs $a Message-ID: <6081429.991336733635.JavaMail.imail@speedy.excite.com> From: mike nordin To: Linac-eng@plato1.aristotle.net Subject: rs $a Date: Thu, 31 May 2001 11:18:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm looking for a telephone number for service org. RS & A. Thanks, Mike Nordin _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: CCD Camera PAL Message-ID: <3B1697CD.B22C1F1B@hsc.vcu.edu> From: Christopher L Bartee To: linac-eng@plato1.aristotle.net Subject: CCD Camera PAL Date: Thu, 31 May 2001 11:13:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am in search of a color ccd camera. This camera came with the exact trac system. The model number is OS-75D system PAL Power DC12V Being in the states PAL systems are hard to find. Thanks, Chris Bartee ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: advice? Message-ID: <5.0.2.1.0.20010531112807.00a15230@pop3.ukonline.co.uk> From: shahed khan To: linac-eng@plato1.aristotle.net Subject: advice? Date: Thu, 31 May 2001 02:33:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Morning Everyone! I was wondering if anyone could give me some information about the design/installation/commissioning/qa/staffing requirements for a 18MeV linac, the cost as well as the time need would be helpful too? I look forward to your answers. Many thanks, Shahed. Shahed Khan BSc (Hons), MSc, CPhys, MInstP 8 Second Cross Road Twickenham Middlesex TW2 5RF Tel: 020 8893 4766 Fax: 020 8893 4092 Mobile:07850 639 113 E-mail:s.khan@ukonline.co.uk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Philips RT50 Message-ID: <7A3389A8D723D511B2260008C7B2BF390D5BEA@wmhmail.whs.org> From: "Williams, Rod" To: "'Jonathan E. Cook'" , linac-eng@plato1.aristotle.net Subject: RE: Philips RT50 Date: Thu, 31 May 2001 02:41:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes I do give me a call or give me your FAX #. In the book the Reset conditions are: -Time Over must have been reached. -The timer must be in the Test-Reset State -TCE and IRRADIATION PHASE must both be inactive. TCE low and IRR.PH./high. TOex Time Over External must be active high this is an external signal which must be high to release reset. The reset condition, which ends the procedure, is only successful when both timers have reached Time over. The TCE signal is on B18 or pin 3 of D16a, the IRRphase is on B17 or pin 5 of D16b,TOex is on C29 or pin 10 of D10b. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Jonathan E. Cook [SMTP:jcook@allina.com] > Sent: Wednesday, May 30, 2001 3:03 PM > To: linac-eng@plato1.aristotle.net > Subject: Philips RT50 > > > > We have a Philips RT50 with a digital timer. Does anyone have schematics/ > service literature to that timer. The only manuals I have for that > machine > are for the analog timer. The xray producing portion of the machine is > the > same. The problem is that we can't reset the timer without unplugging > the > machine. Thanks in advance for your help. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Burle monitor screens Message-ID: <5D14D16DBEBED111A0E100805F8B467401720D4B@DCHS6305> From: Causby Damian To: "'linac-eng@plato1.aristotle.net'" Subject: Burle monitor screens Date: Wed, 30 May 2001 20:18:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" does anybody have any EHT transformers for Burle monitors or know the best place to get them Regards Damian Causby Engineering Manager WP Holman Clinic Launceston General Hospital Tasmania Australia PH 0363 487151 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Schedule change tomorrow Message-ID: From: "Stober, Gary" To: "Leeder, Mike" , "Wilson, Jim" Subject: Schedule change tomorrow Date: Wed, 30 May 2001 13:04:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I need to shift my schedule tomorrow to 7:00am to 3:30pm to work on the injectors in CT. Thanks, Gary Stober Biomedical Technician (503) 216-2988 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Philips RT50 Message-ID: <86256A5C.006DB472.00@notesmta02.allina.com> From: "Jonathan E. Cook" To: linac-eng@plato1.aristotle.net Subject: Philips RT50 Date: Wed, 30 May 2001 12:02:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a Philips RT50 with a digital timer. Does anyone have schematics/ service literature to that timer. The only manuals I have for that machine are for the analog timer. The xray producing portion of the machine is the same. The problem is that we can't reset the timer without unplugging the machine. Thanks in advance for your help. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: ups Message-ID: <00120C0A.C22279@GENERALHEALTH.ORG> From: Kevin_Martin@generalhealth.org To: linac-eng@plato1.aristotle.net Subject: ups Date: Wed, 30 May 2001 05:26:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Any one interested in a 3 KW ups??? kevin martin 225-387-7273 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Verification of blocks Message-ID: From: "Levitsky, Gennady" To: "'LINAC-ENG@PLATO.ARISTOTLE.NET'" Subject: Verification of blocks Date: Fri, 25 May 2001 10:43:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to find out about yours (everybody's on this list) experience with verification systems for blocks. What kind are you using ( "Varian"; domestic - bar code, optical, etc; something else), how reliable and convinient it is to use, universal or not (just for "Varian", let say), interface to "IMPAC" or "VARIS", etc. I think it would be interesting for many participants on this list to share experience and exchange information about that specific subject. Unlike other parts of the machine during treatment, it is of local (each individual hospital) production, so each one might develop its own system of verification. Share of information can lead to an improvement of that system and benefit everybody. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Verification of blocks Message-ID: <01C0E525.4E3AC940.pdickof@scf.sk.ca> From: Peter Dickof Reply-To: pdickof@scf.sk.ca To: "'Levitsky, Gennady'" , "'LINAC-ENG@PLATO.ARISTOTLE.NET'" Subject: RE: Verification of blocks Date: Fri, 25 May 2001 12:16:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" During block cutting, film placement, film-source distance and linac manufacturer (i.e. tray height) are checked. During mounting, film placement, film-Source distance, and block orientation on the tray are checked. On the treatment units, we have an in-house verify and record system which connects to a variety of units: 1) two old Siemens Mevatron 64 and 77 units purchased in the early 1980s. These have (as a standard) switches in the head and all block trays are individually coded (BCD) with pins which depress these switches. The codes are included in the data stream sent from the linear accelerator. 2) a Theratronics T1000 cobalt unit. This uses a DB-9 plug attached to each block tray with different resistor configurations to code each tray. An A/D converter changes this to digital and the codes are included in the data stream sent from the cobalt unit. 3) a newer Varian Clinac 2100C with the "custom coding option'. This has a series of laser-optical sensor pairs on either side of the trays. Stick-on templates obscure some of the pairs uniquely coding each tray. This data is sent back to the control console where the operator must enter the same block code for treatment to proceed. The C-series serial interface does NOT send this data to the verify record system which thus can not check these blocks. The Varian system is also less convenient, requiring the entry of the block code at the console. It is also less safe than the others. Use of the wrong block tray and then also entering the wrong (but matching) block code on the console is unlikely, but we have had errors on the Varian where the operator forgot to insert the blocks and then also entered the "no block" code at the console. The designs are all reasonably reliable; failures we have seen are related to the microswitches on the old Siemens design, drifting analog voltages on the Theratronics design, and intermittent failures of the led/sensor pairs on the Varian design. One potential problem is the same on all units. We often treat multiple phases with different shielding on each phase. We do not change trays at that time; we ship the old trays back to the mould room to add the new shielding; instructions to do this are placed on the treatment sheet on the day before the change. We have had a potential error where the change was not printed on the treatment sheet and could thus have been forgotten. We have considered going to separate trays for each phase, but that would require a larger cerrobend inventory, substantially more trays and more storage space for pre-prepared trays. Given the other flags to multiple phases on the front of the treatment sheet, we have elected to not change our practice. Films are taken on the first day of each phase. Peter ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Mk 2 Portal Vision Message-ID: From: "Denning, Mike" To: "Linac-eng (E-mail)" Subject: Varian Mk 2 Portal Vision Date: Fri, 25 May 2001 11:41:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I had one of my PV's loose all of its preprogrammed R-Arm positions. I reprogrammed the Auto Go and all of the P buttons back to their original positions but the Out button will have an invalid number show up on the pendant. It causes an interlock and occasionally will cause the R-Arm to lose its calibration. I can't find anything in my manuals or in the software about how to program this button.......any thoughts? Mike Denning Eastern Maine Medical Center ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PortalVision(V.5.0) image file Message-ID: <3B0E56DA.ADB1B6A0@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: PortalVision(V.5.0) image file Date: Fri, 25 May 2001 04:58:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could anyone suggest how to obtain raw PortalVisoin images , i.e. without dark and flood filed compensated? In the service monitor, there is a switch to select correction, (image correction?), but I have never seen the function. Does Version 6 have the function to selection image correction at will? Thanks in advance Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Tube disposal concerns Message-ID: <149FFFD49CF5D411815800508B669560267248@sjh_exchange08.covhealth.org> From: "Roliff, Timothy L." To: 'Scot Thiesson' , Linac Eng Subject: RE: Tube disposal concerns Date: Tue, 22 May 2001 05:31:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I suspect one of the Xray/image tube loaders would take them off your hands for the housings. -----Original Message----- From: Scot Thiesson [mailto:sthiesson@scf.sk.ca] Sent: Wednesday, May 16, 2001 11:17 AM To: Linac Eng Subject: Tube disposal concerns We have disposed of an old Simulator and have the X-ray and image intensifier tubes remaining. I need to know how these items can safely be disposed of. The local TV people say take it to the dump. THis does not particularly sit well with me so I was wondering in anyone knows of a salvage company that would safely dispose or recycle these items. Thanks Scot Thiesson Senior Physics Technician Allan Blair Cancer Centre Regina Sask. Canada 306-766-2286 Privileged/Confidential information may be contained in this message. The information contained in this message is intended only for the use of the recipient(s) named above and their co-workers who are working on the same matter. The recipient of this information is prohibited from disclosing the information to any other party unless this disclosure has been authorized in advance. If you are not intended recipient of this message or any agent responsible for delivery of the message to the intended recipient, you are hereby notified that any disclosure, copying, distribution or action taken in reliance on the contents of this message is strictly prohibited. You should immediately destroy this message and kindly notify the sender by reply E-Mail. Please advise immediately if you or your employer does not consent to Internet E-Mail for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of the firm shall be understood as neither given nor endorsed by it. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Elekta RTD Server Message-ID: From: "Vroome, H. de (ONCO)" To: "'Christian.Knopper@LKH-klu.at'" , 'Newsgroup Linac' Subject: RE: Elekta RTD Server Date: Mon, 21 May 2001 06:51:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Cristian, I had the same Idea but in my case there are three problems, 1 The MAC adress of the Networkcard is different and so for nerwork safety reasons I can't use the hosptial hubs in that case without the help of the Network manager. 2 NT has an unique computercode that prefend you to swap harddisks. Maybe that can be solved the same way as it should been done with laoding Software images through Simantec Ghost or PDQI 3 I am not shure thet the servercode generated is influenced by the IP alone ir. Henk de Vroome Dept Clinical Oncology K1-P Leiden Medical University Centre PoBox 9600, 2300 RC Leiden, The Netherlands tel #31 71 526 2914, fax #31 71 526 6760 -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Christian Knopper Sent: Monday, May 21, 2001 14:21 To: Newsgroup Linac Subject: Elekta RTD Server Hello group! We are using two Elekta linacs with RT Desktop. These two Linacs are networked, and connected to a central data server. This server is a normal PC,configured as a primary Domain server with two SCSI-HDD in it. The D: Partition of the first HDD is mirrored onto the secon HDD. This and the automatic daily backup are the only safety features against loosing data. Now we bought a second server PC for redundance. We installed NT server on it, gave it the same IP adress, and the same Host name. Now the theory is, that we make a backup of the normal server, and if the normal server brakes down we restore the backup onto the "spare" server, and also restore the last automatic backup of the patients onto the server. But as I told you this is the theory. I' am in contact with the local Elekta business unit. There is no official statement from Crawley, and it seems, that nobody have tried something like this before. Is there anybody who have triedsomething like this before, or has another idea, except buy a professional server. Christian Knopper Christian.Knopper@LKH-klu.at Electronic Engineer LKH-Klagenfurt AUSTRIA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta RTD Server Message-ID: From: Christian Knopper Reply-To: Christian.Knopper@LKH-klu.at To: Newsgroup Linac Subject: Elekta RTD Server Date: Mon, 21 May 2001 04:20:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello group! We are using two Elekta linacs with RT Desktop. These two Linacs are networked, and connected to a central data server. This server is a normal PC,configured as a primary Domain server with two SCSI-HDD in it. The D: Partition of the first HDD is mirrored onto the secon HDD. This and the automatic daily backup are the only safety features against loosing data. Now we bought a second server PC for redundance. We installed NT server on it, gave it the same IP adress, and the same Host name. Now the theory is, that we make a backup of the normal server, and if the normal server brakes down we restore the backup onto the "spare" server, and also restore the last automatic backup of the patients onto the server. But as I told you this is the theory. I' am in contact with the local Elekta business unit. There is no official statement from Crawley, and it seems, that nobody have tried something like this before. Is there anybody who have triedsomething like this before, or has another idea, except buy a professional server. Christian Knopper Christian.Knopper@LKH-klu.at Electronic Engineer LKH-Klagenfurt AUSTRIA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: <000601c0e118$3034b840$09598690@default> From: Jonathan M Watts To: "Rozenblat, Alex" , linac-eng@plato1.aristotle.net Subject: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Sun, 20 May 2001 02:32:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi there Alex, I work with an Elekta agent in Australia, and have always (with the very odd occasion) found them to be helpful - I'm sorry you don't seem to have the same experience. If you too are experiencing the +- 15v problem , please check and adjust (if required) parts 19 and 20 of the +-15v supply monitor item and adjust parts 19 and 20 to approx.. 150mV tolerance of the required voltage. I trust this may be the root of your problems. Best Rgds Jonathan Watts -----Original Message----- From: Rozenblat, Alex To: 'Al Aqualino' Cc: 'linac' Date: Thursday, 17 May 2001 00:11 Subject: RE: Elekta RT Desktop: ?intermittent +/-15V err reports >Hello, Al > >I am glad you brought this topic up. We have (and not only we as I can see >now)the same problem on one (out of 3) our SLA after this upgrade. In our >case it happens during Intersegm. state in between beams. Swapping PSs did >not help. Now I know why. >As many people mentioned here this problem is well known to Electa. We got >our upgrade a couple of months ago, so looks like Electa does not care. I >hope they monitor this side as Siemens people do. > >This is something different - accidentally enough our second SL after this >upgrade developed different sickness - it goes to Fac.1 state without any >visible reason a couple of times a day. Printouts don't give us any valuable >information because all Inhibit. are coming from this state. >Does anyone have this kind of behaviour happening after upgrade? > >Alex Rozenblat, >TSRCC, Toronto, Canada > >-----Original Message----- >From: Al Aqualino [mailto:aa2h@virginia.edu] >Sent: Tuesday, May 15, 2001 4:41 PM >To: linac-eng@plato1.aristotle.net >Subject: Elekta RT Desktop: ?intermittent +/-15V err reports > > > Approximately one month ago, we upgraded our 9 year old Elekta SL-18 >with MLC to run RT Desktop. The same week, the therapists began telling me >they were getting intermittent 280 & 281 terminations (280 reports a fault >in a -15V supply, 281 in a + 15V supply). As Elekta dudes know, there are 6 >such power supplies, and the fault could arise from any of the 6. Watching >these 2 items from service mode, none of the part 4 values ever appear to >drop outside the part 19,20 set limits. Still, our Service rep kindly tried >replacing the supply (part 104) operating closest to the limits. Problem >persisted. He then replaced the next "worst" supply. Problem persisted. >He tried changing part 10, to shift the level for the limits. Problem >persisted. > My intuition is that this actually is a software problem, whose >appearance indeed correlates with the RT Desktop software installation. (I >think I've heard that RT Desktop averages realtime error values differently >than did the old software, to further minimize spurious error reports from >noise. Since items 280/281 actually cycle between 6 different supply >readings, it would have been easy for a software engineer to have made a >coding error.) But when I ask Elekta service about this possibility, they >respond that it can't be, because no other sites are reporting this problem. > I think one possibility is that other sites are not reporting it >because it's an error the therapists can clear at the treatment unit, and do >a "finish beam" prescription, without telling anyone. I think most >therapists are too busy to notify service about problems unless the problem >downs the machine. > I therefore would appreciate Elekta readers who run RT Desktop >asking their therapists directly if they have seen these intermittent >280/281 errors. Probably best to respond privately to me, so the list >doesn't become crowded with responses not everyone will care about. (I can >summarize responses to those interested.) > Thanks! > - Al > > >~~~~~~~~~~~~~~~~~~~~~~~~~~ >Al Aqualino >U.Va. Radiological Physics >mailto:aa2h@virginia.edu >voice: 804-982-0781 >fax: 804-982-0792 >~~~~~~~~~~~~~~~~~~~~~~~~~~ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Chillers Message-ID: <3579F04D3B99D4119D2200805FC1CFE56F0F61@S02MEXCH2> From: "Gouin, Chris" To: linac-eng@plato1.aristotle.net Subject: Chillers Date: Fri, 18 May 2001 06:54:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, My hospital is building a free standing cancer center and I am looking for info about companies that produce chillers. We will be installing two high energy Varian linacs. Varian has info about one company (Filtrine) on their website, but I am told that one is not required to purchase a chiller from this company. If anyone can offer any more info or advise (indoor vs. outdoor placement), I would be greatful. You can respond publicly or contact me privately. Thanks, Christopher A. Gouin, MS Community Health Partners Dept. of Radiation Oncology 3700 Kolbe Rd. Lorain, OH 44053 Phone: 440-233-1044 Fax: 440-245-1578 CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: From: David Price To: Guy.Turner@WTH.org, rtexec@pd.jaring.my, Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Thu, 17 May 2001 09:31:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just to clarify my position, They both seem to work most of the time, which means some of the time, they are both FUBAR. The real problem lies with responsability on resolving issues, in this case, you buy a linac and attach a record and verify system and what ever else to it. Everything else is subordante to that decision, becasue you can treat patients without impac or varis, but not the other way around. A cost of bussiness consideration For illstration purposes only, lets say you have an all impac department, and lets say Brand X dosn't like impac and you are in the market for a new machine. Do you throw brand X out from consideration, do you ask impac to make it work, or do you tell brand X; if you want to sell us a Linac, you need to get with the program and make it work. If I was brand X, I be be inclinded to make sure it worked.. that is, if you can recover the increased expenses and can justify the market share If Impac was 1% of the market in R&V systems, you might not care, but if impac is 80% of the R&V systems in uses, know you cant afford not to care Food for thought!!! >From: "Turner, Guy" >To: 'David Price' , rtexec@pd.jaring.my, >Dave.Pinchin@cdhb.govt.nz >CC: linac-eng@plato1.aristotle.net >Subject: RE: Varis or Impac or Others? >Date: Thu, 17 May 2001 11:54:53 -0500 > >We just went through an intense evaluation of both Varis and Impac. They >are all going to tell you that their product has had some "issues" in the >past but that they were worked out quickly with minor inconvienience to the >customer. And that most of their customers experience no problems a >majority of the time and just love their product. I have also found that >you must be very familiar with the version and release history, vendors >tend >to pick the best statistics and examples from all versions of the product >even though they have nothing to do with the version you will be >purchasing.....which probably isn't even available to the public yet. > >My bottom line - customer service. My feeling is that anything can be >worked through as long as the vendor understands that the customers needs >must be met - quickly. The best way to at least get some understanding of >how well a vendor treats the customer is by talking to other customers. >And >not the ones that the vendor picks, ask for the entire list of customers. >If they won't give it to you "because the customers have not given >permission", find out through other contacts. It's not foolproof, but I >think it is the best way to evaluate a vendor. > >Guy Turner > > >-----Original Message----- >From: David Price [mailto:roast_em@hotmail.com] >Sent: Wednesday, May 16, 2001 7:32 AM >To: rtexec@pd.jaring.my; Dave.Pinchin@cdhb.govt.nz >Cc: linac-eng@plato1.aristotle.net >Subject: Re: Varis or Impac or Others? > > >Funny you should say that. We are experiancing something like that right >now.. Impac/MLC/Imrt > >We will sort it out in the in I am sure, but it reminds me when I was >working in Diagnostic 15-18 years ago when DVI(Digital Vascular >Imaging)technology first came out. There were several add on after market >systems available when I was working for Phillips. Anyway, Adac was selling >alot of systems as addon's and there aways problems with exposure control. >What a nightmere it was, they would always say it was our problem and be >would have to go out and defend our systems, which in my opinon were never >the problem. The problem is the OEM is always having to defend themselves >from accuzations, which don't hold any water in alot of cases. > >It is my opinon it is always the responsability of the add on system to >make > >sure thir system works on the main system, not the other way around. IN the >case of impac, our case, I could simple turn it off and push it off the >counter and the 2100/mlc would work just fine without it, I am sure. Even >if > >the 2100/mlc software or hardware has a clitch in it, as long as it works >fine with the clitch, then it is still the addon vendor to solve the >problem. > >ON the flip side, I am not sure Varis works 100% either, as we have systems >that run both, and both systems seem to experinace communication errors >from > >time to time. So in ths case, they both need to work on the problem, but >you > >can bet they will not be working on it togather > > >David Price >SHands Cancer Center >2000 SW archer Rd >Gainesville Fla, 32610 >W 352-395-0316 > >Opinions expressed here are entirely my own and do not constitute any >affirmation from my employer, the University of Florida, or my pet gerbil, >Herbie > >"Linac Engineers List Server (E-mail)" >linac-eng@plato1.aristotle.net > > > > > > >From: rtexec > >To: Dave.Pinchin@cdhb.govt.nz > >CC: linac-eng@plato1.aristotle.net > >Subject: Varis or Impac or Others? > >Date: Mon, 09 Apr 2001 16:19:01 +0800 > > > > > >Dave: > > > >The point you make concerning vendors saying "Its the other guy's > >machine , not ours" is probably as old as technology but completely > >valid. Meanwhile the finger pointing goes on, your still waiting and > >slowly boiling. A single vendor is a good solution from the engineering > >point of view. But what you gain in technical security you lose in > >freedom of choice. > > > >Being able to choose the best equipment available is what every > >radiotherapy department should be able to do. When you stay with a > >single vendor then your choice is the best that they have to offer. > >These two choices are not always the same thing. The differences can be > >function, price and support. > > > >Now in the perfect world that none of us has ever seen the vendors would > >realize that whoever provides good support wins the customers heart. > >This does happen. A good example is the recent posting concerning > >excellent support provided by Siemens for a hospital's MLC problems. The > >work done had been above and beyond what the hospital expected and they > >let us all know. I am sure that the hospital will remember the vendor > >the next time they consider an equipment purchase. But maybe we should > >make sure the vendors know that we expect this type of support. If you > >are not getting cooperation go to the top. If you want their names and > >numbers just ask me. I am sure they would love to hear from you if they > >haven't already read these postings. Actually they do care its just that > >------- fill in your own standard vendor excuse ------!!! > > > >Now I apologize to any vendor who takes objection to my tone. I know > >what every one of them is capable of doing, both good and bad. > >But the vendors have to develop an awareness that the radiotherapy > >department is getting very complicated now. No single vendor can truly > >meet all the customers needs. They have to learn that a little > >cooperation between competitors is not a bad thing. Hey, and we all know > >they really do want us to be satisfied with their products. > > > >Just one more thing. As to the choice of Varian's Varis or Impac's > >Impac, just remember that there is also Lantis from Siemens, RT Desktop > >from Elekta and Visir from MDS Nordion. So look around a little. > > > >Sid Mauck > >RT Exec > > > > > > > > >David Price >SHands Cancer Center >2000 SW archer Rd >Gainesville Fla, 32610 >W 352-395-0316 > >Opinions expressed here are entirely my own and do not constitute any >affirmation from my employer, the University of Florida, or my pet gerbil, >Herbie > >"Linac Engineers List Server (E-mail)" >linac-eng@plato1.aristotle.net > > > >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: From: "Turner, Guy" To: 'David Price' , rtexec@pd.jaring.my, Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Thu, 17 May 2001 08:54:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We just went through an intense evaluation of both Varis and Impac. They are all going to tell you that their product has had some "issues" in the past but that they were worked out quickly with minor inconvienience to the customer. And that most of their customers experience no problems a majority of the time and just love their product. I have also found that you must be very familiar with the version and release history, vendors tend to pick the best statistics and examples from all versions of the product even though they have nothing to do with the version you will be purchasing.....which probably isn't even available to the public yet. My bottom line - customer service. My feeling is that anything can be worked through as long as the vendor understands that the customers needs must be met - quickly. The best way to at least get some understanding of how well a vendor treats the customer is by talking to other customers. And not the ones that the vendor picks, ask for the entire list of customers. If they won't give it to you "because the customers have not given permission", find out through other contacts. It's not foolproof, but I think it is the best way to evaluate a vendor. Guy Turner -----Original Message----- From: David Price [mailto:roast_em@hotmail.com] Sent: Wednesday, May 16, 2001 7:32 AM To: rtexec@pd.jaring.my; Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: Re: Varis or Impac or Others? Funny you should say that. We are experiancing something like that right now.. Impac/MLC/Imrt We will sort it out in the in I am sure, but it reminds me when I was working in Diagnostic 15-18 years ago when DVI(Digital Vascular Imaging)technology first came out. There were several add on after market systems available when I was working for Phillips. Anyway, Adac was selling alot of systems as addon's and there aways problems with exposure control. What a nightmere it was, they would always say it was our problem and be would have to go out and defend our systems, which in my opinon were never the problem. The problem is the OEM is always having to defend themselves from accuzations, which don't hold any water in alot of cases. It is my opinon it is always the responsability of the add on system to make sure thir system works on the main system, not the other way around. IN the case of impac, our case, I could simple turn it off and push it off the counter and the 2100/mlc would work just fine without it, I am sure. Even if the 2100/mlc software or hardware has a clitch in it, as long as it works fine with the clitch, then it is still the addon vendor to solve the problem. ON the flip side, I am not sure Varis works 100% either, as we have systems that run both, and both systems seem to experinace communication errors from time to time. So in ths case, they both need to work on the problem, but you can bet they will not be working on it togather David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: rtexec >To: Dave.Pinchin@cdhb.govt.nz >CC: linac-eng@plato1.aristotle.net >Subject: Varis or Impac or Others? >Date: Mon, 09 Apr 2001 16:19:01 +0800 > > >Dave: > >The point you make concerning vendors saying "Its the other guy's >machine , not ours" is probably as old as technology but completely >valid. Meanwhile the finger pointing goes on, your still waiting and >slowly boiling. A single vendor is a good solution from the engineering >point of view. But what you gain in technical security you lose in >freedom of choice. > >Being able to choose the best equipment available is what every >radiotherapy department should be able to do. When you stay with a >single vendor then your choice is the best that they have to offer. >These two choices are not always the same thing. The differences can be >function, price and support. > >Now in the perfect world that none of us has ever seen the vendors would >realize that whoever provides good support wins the customers heart. >This does happen. A good example is the recent posting concerning >excellent support provided by Siemens for a hospital's MLC problems. The >work done had been above and beyond what the hospital expected and they >let us all know. I am sure that the hospital will remember the vendor >the next time they consider an equipment purchase. But maybe we should >make sure the vendors know that we expect this type of support. If you >are not getting cooperation go to the top. If you want their names and >numbers just ask me. I am sure they would love to hear from you if they >haven't already read these postings. Actually they do care its just that >------- fill in your own standard vendor excuse ------!!! > >Now I apologize to any vendor who takes objection to my tone. I know >what every one of them is capable of doing, both good and bad. >But the vendors have to develop an awareness that the radiotherapy >department is getting very complicated now. No single vendor can truly >meet all the customers needs. They have to learn that a little >cooperation between competitors is not a bad thing. Hey, and we all know >they really do want us to be satisfied with their products. > >Just one more thing. As to the choice of Varian's Varis or Impac's >Impac, just remember that there is also Lantis from Siemens, RT Desktop >from Elekta and Visir from MDS Nordion. So look around a little. > >Sid Mauck >RT Exec > > > David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C on a UPS Message-ID: <5.0.0.25.0.20010517214827.01d2e090@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Cc: "Ukos, John" Subject: Re: Varian 2100C on a UPS Date: Thu, 17 May 2001 06:08:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At 02:00 AM 15/05/01, you wrote: >I have seen posting regarding UPS systems for Linacs so I'm hoping that >wealth of knowledge will surface again. We are looking at installing these >systems for machines that are to be installed. Please share the good the bad >and the ugly with me. Hi John and all the list. We are running an Elekta SL15 on a Liebert 40KVA UPS with sufficient batteries for about 8 minutes at full load. (32 x 24AH 12V sealed lead acid.) The unit was installed in February this year so I don't have a lot of experience with it but there hasn't been any hint of a problem to date. The intention is to buffer short outages of the mains only and allow the completion of any beam already set up. We have dedicated refrigerated water chillers on the linacs at this site and providing a UPS to power the chiller as well as the linac would be a much bigger deal. We anticipate about 40 minutes in prep and about 15-20 minutes with beam on. We will be running the water pump only of the chiller from the UPS to allow the linac heat to still dissipate into the chilled water tank. The amount of time this will give has not been tested yet. Also to continue beaming you need lights and CCTV on the UPS as well. If you need longer times you just add more batteries. The linac itself draws about 22amps per phase while beaming. We have already had a couple of short (measured in seconds) power outages and the linac didn't notice anything. Previously we would have lost close to half an hour by the time the linac software reloaded and the timers timed out. I know of one other SL which was going to be powered from a 30KVA UPS but I haven't heard of the progress. If there are any queries I would be pleased to try to help if I can. Regards to all. Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Phone: 61 (0) 8 9381 5655 Mobile: 041 993 7776 Fax:61 (0) 8 9381 4364 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: plastic MLC nuts. Message-ID: From: David Price To: Dave.Pinchin@cdhb.govt.nz, linac-eng@plato1.aristotle.net Subject: Re: plastic MLC nuts. Date: Thu, 17 May 2001 06:13:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The nuts do change and have been known to swell, but there is a positive note to this IMHO, when the leave collide, as they will do from time to time, the nuts give instead of break the shafts >From: "Dave Pinchin" >To: >Subject: plastic MLC nuts. >Date: Fri, 11 May 2001 10:00:07 +1200 > >G'day, >Sorry if I've confused you all. What I was hoping to convey was a suspicion >that plastics can change shape in radiation areas. > >Graham Freestone confirms this. > > > Materials do suffer radiation damage, generally causing them to swell: >(a> > figure from the past in my Msc course was 'Mega Rads', > >If so then perhaps the idea of using precision plastic nuts in an MLC >environment is a problem waiting to happen. Refer to the list entry from >David Fenn on 9 May. > > > The nuts were found to be made from a plastic material, > > (which raised a few eyebrows for what is supposed to be a "precision" > > component pair!). Each had one stiff spot along it's length and when the > > screw diameter was measured with a micrometer, the diameter was > > greater by 2-4thou at the stiff spot. > >Presumably this worked when new. So what had changed????? > >Personally, I have never even seen a millenium MLC. So this line of thought >might not be worth the paper that it's not written on. > >It might be worthwhile for millenium MLC sites to chase Varian on this one. > >Dave. > > > > >** This email and attachments have been scanned for content and viruses >and is believed to be clean ** > >This email or attachments may contain confidential or legally >privileged information intended for the sole use of the addressee(s). >Any use, redistribution, disclosure, or reproduction of this message, >except as intended, is prohibited. If you received this email in error, >please notify the sender and remove all copies of the message, >including any attachments. Any views or opinions expressed in this >email (unless otherwise stated) may not represent those of Canterbury >District Health Board. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Green Lasers Vs. Red Lasers Message-ID: From: "Nelson, Steve" To: "'Abbassian, Farhoud'" , "AE-LIST (E-mail)" Subject: RE: Green Lasers Vs. Red Lasers Date: Thu, 17 May 2001 04:12:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Farhoud and group, We just finished installing four LAP green, remote controlled lasers in our new Varian 21EX/S room. They are by far the neatest boxes I've seen. The remote controls vert. and horiz. displacement, tilt, rotation and focus while being able to stand at isocenter. This has allowed us to perform the best alignment that I have ever seen. And, the projected lines are thin and (for lack of a better word) "crisp". BTW we chose to have the back pointer to be red so as to easily distinguish it from the others. regards, Stephen -----Original Message----- From: Abbassian, Farhoud [mailto:Farhoud.Abbassian@rmp.uhn.on.ca] Sent: Wednesday, May 16, 2001 2:41 PM To: AE-LIST (E-mail) Subject: Green Lasers Vs. Red Lasers We are in the process of investigating the possibility of replacing our conventional Red Lasers with Green Lasers - our IMRT physicist claims that Green Lasers (in particular Solid State Laser Diodes at his old job) produce finer line width and less drift. Currently, we are using Gammex Red HeNe Laser Tubes in our treatment rooms. They can be easily converted to Green Lasers with minimal cost. Has anyone done this? If so, by how much did you improve the line width? Also, I need your suggestions and experience with Solid State Laser Diodes, (i.e. CEMAR Lasers or any other brand) cost, lifetime, line width, etc. Thanks in advance, Farhoud Abbassian Princess Margaret Hospital Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Symmetry on Elekta SL20 Message-ID: <000201c0de72$358ac9e0$10696d0a@elekta.jp> From: tim dowden To: Darcy Mason Cc: Linac-Eng Subject: Re: Symmetry on Elekta SL20 Date: Tue, 15 May 2001 21:48:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Dan, I'd suspect your test gear. Check out your scanner to confirm that the symmetry change is real. Maybe swap the scanner to one of your other machines to confirm that it is working correctly. When you see the spike in the 2R symmetry does the 2R run value change?? If so this would indicate that the servo is compensating for a real tilt. Your 2T error monitor is also a good guide. Sudden changes of 2 percent should be quite apparent. Alternatively you can confirm the symmetry with a film. If your symmetry is not consistent at different angles (i.e. say 90 degrees changes from say 2% to 4% on different rotations) then your problem is not associated with your look up table. All the look up table does is add an offset so if there a symmetry error then it should always be the same. Check that your frequency is not drifting. If the tuner is wandering then this will very likely effect the 2T symmetry. Observe the phase legs and the comp phase error to see if there are any sudden changes. Try putting the tuner into manual and see if you can simulate the effect on symmetry . A loose connector on your rigid co ax or cracks on your RF probes will cause the tuner to wander. Check also that the dose rate (DR) is stable. Frequency drift will also effect your DR A floppy gun filament can also cause 2T symmetry problems. I've also had the glass base in the gun assembly which secures the posts cracked. A poor connection on your steering currents can also effect your symmetry. When monitoring your 2R and 2Ri use the current monitors not p4 values. 1R and 1T will be more tricky because you will have to "get in" with a meter. Took up two long cables to a muti meter to TS 22 and observe the voltages when carefully rotating the gantry. Another shot....you haven't had any MR m/c's installed near by lately?? Hope you find this useful, Tim Dowden Elekta HK ----- Original Message ----- From: Darcy Mason To: 'linac-eng@plato.aristotle.net' Sent: Tuesday, May 15, 2001 2:54 AM Subject: Symmetry on Elekta SL20 I'm new to this list, so I hope this question is on target. This is an unusual situation, and we are hoping that someone has some insight into this problem. We are having problems with symmetry on one ofour Elekta SL20 linacs. As background, the story we have been told is that the automatic servo is usually turned OFF for the 2T plane (cross-plane). Then there is a look-up table (LUT) which sets a good start value for the 2T I ctrl settings as a function of gantry angle, which determines the start-point steering. Using a Profiler device mounted in the shielding tray slot, we have found that the 2T symmetry changes with gantry angle quite a bit. In particular, our symmetry was poor at gantry 90, 18 MV. Then, during routine QA, it was found to suddenly get worse by an additional 2%, and has stayed there. The 6MV mode, and the inplane all show changes in symmetry at about the same time. The one that concerns us is the 18 MV cross-plane at gantry 90, where an already unacceptable symmetry got worse by 2%. So, we thought to edit the look-up table to correct that. There is a configuration procedure, where the unit captures symmetry info while you rotate through -180 to 180, and creates the LUT for you. We tried this but it did not work well, or even reproducibly. Then, we edited the LUT by hand to get good symmetry at discrete angles, and interpolated in between (this also made the LUT shape similar to our other SL20 unit where the symmetry problems are not as bad). The short story is that this hand-edit made matters much worse. In particular, it created an odd "discontinuity" in the symmetry captured by the Profiler as we arced. At a particular gantry angle, the symmetry suddenly shifted dramatically, stayed there for a while, then shifted suddenly back to where it was. The sudden jumps were not at the same gantry angle when rotating clockwise as compared with rotating counter-clockwise. Another piece of info is that for the INplane, a spike in the symmetry occurs at the exact same angle, but quickly goes back, presumably because of the servo action in that direction. We don't know which is cause, and which is effect. So, we are going back to our original LUT, but have still not solved the original problem. Anyone have any insight into this?? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Any Water filter for Varina 600CD? Message-ID: From: Kerry Clark To: "'kimyeung@ultraline'" , "''Linac-Eng@plato1.aristotle.net' '" Subject: RE: Any Water filter for Varina 600CD? Date: Wed, 16 May 2001 11:04:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The advise we got from Varian was no change needed. Kerry > -----Original Message----- > From: kimyeung@ultraline [SMTP:kimyeung@netvigator.com] > Sent: Thursday, 17 May 2001 01:41 > To: ''Linac-Eng@plato1.aristotle.net' ' > Subject: Re: Any Water filter for Varina 600CD? > > Hi Colleagues, > > Do we need to replace the de-ionizer with a filter on 600CD? > > Best regards, > > Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Green Lasers Vs. Red Lasers Message-ID: From: "Abbassian, Farhoud" To: "AE-LIST (E-mail)" Subject: Green Lasers Vs. Red Lasers Date: Wed, 16 May 2001 10:40:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are in the process of investigating the possibility of replacing our conventional Red Lasers with Green Lasers - our IMRT physicist claims that Green Lasers (in particular Solid State Laser Diodes at his old job) produce finer line width and less drift. Currently, we are using Gammex Red HeNe Laser Tubes in our treatment rooms. They can be easily converted to Green Lasers with minimal cost. Has anyone done this? If so, by how much did you improve the line width? Also, I need your suggestions and experience with Solid State Laser Diodes, (i.e. CEMAR Lasers or any other brand) cost, lifetime, line width, etc. Thanks in advance, Farhoud Abbassian Princess Margaret Hospital Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RMS Limit fault Message-ID: <18.ce37de8.2834136d@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: RMS Limit fault Date: Wed, 16 May 2001 09:31:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone: I have a Cl-600C (C2) that's experiencing an intermittent RMS limit fault on the LIFT drive servo. Doesn't seem to be any pattern except that it seems to occur most often after the couch has been setting for a while. It only "faults" in the "UP" direction. Releasing the MEB's for a second allows the fault to reset and then the LIFT functions normally. The motor was replaced as well as the LIFT servo board and supervisory module. Adjustments were "tweaked" every which way in an attempt to "simulate" the failure. We have obviously overlooked something. BTW the Gantry functions normally. Has anybody seen this before? Thanks in advance for your information. Kindest regards ... Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Tube disposal concerns Message-ID: From: Doug Tymofichuk Reply-To: dougt@CancerBoard.ab.ca To: Scot Thiesson Cc: Linac Eng Subject: Re: Tube disposal concerns Date: Wed, 16 May 2001 08:39:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Put 'em on Ebay, someone will buy them!! ;-) On Wed, 16 May 2001 10:16:47 -0600 Scot Thiesson wrote: > We have disposed of an old Simulator and have the X-ray and > image intensifier tubes remaining. > I need to know how these items can safely be disposed of. > The local TV people say take it to the dump. > THis does not particularly sit well with me so I was > wondering in anyone knows of a salvage company that would > safely dispose or recycle these items. > Thanks > > Scot Thiesson > Senior Physics Technician > Allan Blair Cancer Centre > Regina Sask. Canada > 306-766-2286 > ---------------------- Doug Tymofichuk dougt@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Tube disposal concerns Message-ID: <3B02A7EF.8351DDD9@scf.sk.ca> From: Scot Thiesson To: Linac Eng Subject: Tube disposal concerns Date: Wed, 16 May 2001 08:16:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have disposed of an old Simulator and have the X-ray and image intensifier tubes remaining. I need to know how these items can safely be disposed of. The local TV people say take it to the dump. THis does not particularly sit well with me so I was wondering in anyone knows of a salvage company that would safely dispose or recycle these items. Thanks Scot Thiesson Senior Physics Technician Allan Blair Cancer Centre Regina Sask. Canada 306-766-2286 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens rotating target Message-ID: <86256A4E.00589512.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: mike nordin Cc: Linac-eng@plato1.aristotle.net Subject: Re: Siemens rotating target Date: Wed, 16 May 2001 08:05:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One of the the limiting factor for dose rate on "straight through" accelerators is target heat dissipation. By utilizing a spinning target in which the beam is incident on only one sector, the heat is spread out over a much larger area. This greatly increases the maximum doserate that can be run in normal use. In the case of Spintar, the target disk is sort of like a little paddle wheel driven by cooling water. Tim Waldron mike nordin on 05/16/2001 10:38:57 AM To: Linac-eng@plato1.aristotle.net cc: (bcc: Timothy J. Waldron/MDACC) Subject: rotating target Seimens literature speaks of Spintar, a rotating target. I'm wondering how and why. Thanks Mike Nordin _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: rotating target Message-ID: <15812680.990027537232.JavaMail.imail@seamore.excite.com> From: mike nordin To: Linac-eng@plato1.aristotle.net Subject: rotating target Date: Wed, 16 May 2001 07:38:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Seimens literature speaks of Spintar, a rotating target. I'm wondering how and why. Thanks Mike Nordin _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Martin Shapiro Message-ID: <000801c0de11$f2c85740$2d66aec7@techop.com> From: technical options To: "Schebler, Joe" , linac-eng@plato1.aristotle.net Subject: Re: Martin Shapiro Date: Wed, 16 May 2001 06:10:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Marty Shapiro is at Accelinear Company. Their phone number is 800-445-4516. I'm sure they'd be happy to hear from you. (Or anyony else.) Lisa Przepasniak Technical Options of Georgia ----- Original Message ----- From: Schebler, Joe To: Sent: Wednesday, May 16, 2001 9:02 AM Subject: Martin Shapiro > Marty, > Please post your company phone # , I would like to call you. > Thanx > Joe Schebler > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: nucletron Simulator part Message-ID: <00116A88.C22279@GENERALHEALTH.ORG> From: Kevin_Martin@generalhealth.org To: linac-eng@plato1.aristotle.net Subject: nucletron Simulator part Date: Wed, 16 May 2001 06:22:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Howdy we are in need of a motor " In-line II drive motor " for our Simulix-MC sim. Please e-mail me directly if there are any spares available thanks have a good day eh! Kevin martin 225-387-7273 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Any Water filter for Varina 600CD? Message-ID: <3B028369.83B264DA@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Any Water filter for Varina 600CD? Date: Wed, 16 May 2001 05:40:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Do we need to replace the de-ionizer with a filter on 600CD? Best regards, Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: From: "Rozenblat, Alex" To: 'Al Aqualino' Cc: 'linac' Subject: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Wed, 16 May 2001 05:09:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, Al I am glad you brought this topic up. We have (and not only we as I can see now)the same problem on one (out of 3) our SLA after this upgrade. In our case it happens during Intersegm. state in between beams. Swapping PSs did not help. Now I know why. As many people mentioned here this problem is well known to Electa. We got our upgrade a couple of months ago, so looks like Electa does not care. I hope they monitor this side as Siemens people do. This is something different - accidentally enough our second SL after this upgrade developed different sickness - it goes to Fac.1 state without any visible reason a couple of times a day. Printouts don't give us any valuable information because all Inhibit. are coming from this state. Does anyone have this kind of behaviour happening after upgrade? Alex Rozenblat, TSRCC, Toronto, Canada -----Original Message----- From: Al Aqualino [mailto:aa2h@virginia.edu] Sent: Tuesday, May 15, 2001 4:41 PM To: linac-eng@plato1.aristotle.net Subject: Elekta RT Desktop: ?intermittent +/-15V err reports Approximately one month ago, we upgraded our 9 year old Elekta SL-18 with MLC to run RT Desktop. The same week, the therapists began telling me they were getting intermittent 280 & 281 terminations (280 reports a fault in a -15V supply, 281 in a + 15V supply). As Elekta dudes know, there are 6 such power supplies, and the fault could arise from any of the 6. Watching these 2 items from service mode, none of the part 4 values ever appear to drop outside the part 19,20 set limits. Still, our Service rep kindly tried replacing the supply (part 104) operating closest to the limits. Problem persisted. He then replaced the next "worst" supply. Problem persisted. He tried changing part 10, to shift the level for the limits. Problem persisted. My intuition is that this actually is a software problem, whose appearance indeed correlates with the RT Desktop software installation. (I think I've heard that RT Desktop averages realtime error values differently than did the old software, to further minimize spurious error reports from noise. Since items 280/281 actually cycle between 6 different supply readings, it would have been easy for a software engineer to have made a coding error.) But when I ask Elekta service about this possibility, they respond that it can't be, because no other sites are reporting this problem. I think one possibility is that other sites are not reporting it because it's an error the therapists can clear at the treatment unit, and do a "finish beam" prescription, without telling anyone. I think most therapists are too busy to notify service about problems unless the problem downs the machine. I therefore would appreciate Elekta readers who run RT Desktop asking their therapists directly if they have seen these intermittent 280/281 errors. Probably best to respond privately to me, so the list doesn't become crowded with responses not everyone will care about. (I can summarize responses to those interested.) Thanks! - Al ~~~~~~~~~~~~~~~~~~~~~~~~~~ Al Aqualino U.Va. Radiological Physics mailto:aa2h@virginia.edu voice: 804-982-0781 fax: 804-982-0792 ~~~~~~~~~~~~~~~~~~~~~~~~~~ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Martin Shapiro Message-ID: From: "Schebler, Joe" To: "'linac-eng@plato1.aristotle.net'" Subject: Martin Shapiro Date: Wed, 16 May 2001 05:02:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Marty, Please post your company phone # , I would like to call you. Thanx Joe Schebler ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varis or Impac or Others? Message-ID: From: David Price To: rtexec@pd.jaring.my, Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: Re: Varis or Impac or Others? Date: Wed, 16 May 2001 04:31:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Funny you should say that. We are experiancing something like that right now.. Impac/MLC/Imrt We will sort it out in the in I am sure, but it reminds me when I was working in Diagnostic 15-18 years ago when DVI(Digital Vascular Imaging)technology first came out. There were several add on after market systems available when I was working for Phillips. Anyway, Adac was selling alot of systems as addon's and there aways problems with exposure control. What a nightmere it was, they would always say it was our problem and be would have to go out and defend our systems, which in my opinon were never the problem. The problem is the OEM is always having to defend themselves from accuzations, which don't hold any water in alot of cases. It is my opinon it is always the responsability of the add on system to make sure thir system works on the main system, not the other way around. IN the case of impac, our case, I could simple turn it off and push it off the counter and the 2100/mlc would work just fine without it, I am sure. Even if the 2100/mlc software or hardware has a clitch in it, as long as it works fine with the clitch, then it is still the addon vendor to solve the problem. ON the flip side, I am not sure Varis works 100% either, as we have systems that run both, and both systems seem to experinace communication errors from time to time. So in ths case, they both need to work on the problem, but you can bet they will not be working on it togather David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: rtexec >To: Dave.Pinchin@cdhb.govt.nz >CC: linac-eng@plato1.aristotle.net >Subject: Varis or Impac or Others? >Date: Mon, 09 Apr 2001 16:19:01 +0800 > > >Dave: > >The point you make concerning vendors saying "Its the other guy's >machine , not ours" is probably as old as technology but completely >valid. Meanwhile the finger pointing goes on, your still waiting and >slowly boiling. A single vendor is a good solution from the engineering >point of view. But what you gain in technical security you lose in >freedom of choice. > >Being able to choose the best equipment available is what every >radiotherapy department should be able to do. When you stay with a >single vendor then your choice is the best that they have to offer. >These two choices are not always the same thing. The differences can be >function, price and support. > >Now in the perfect world that none of us has ever seen the vendors would >realize that whoever provides good support wins the customers heart. >This does happen. A good example is the recent posting concerning >excellent support provided by Siemens for a hospital's MLC problems. The >work done had been above and beyond what the hospital expected and they >let us all know. I am sure that the hospital will remember the vendor >the next time they consider an equipment purchase. But maybe we should >make sure the vendors know that we expect this type of support. If you >are not getting cooperation go to the top. If you want their names and >numbers just ask me. I am sure they would love to hear from you if they >haven't already read these postings. Actually they do care its just that >------- fill in your own standard vendor excuse ------!!! > >Now I apologize to any vendor who takes objection to my tone. I know >what every one of them is capable of doing, both good and bad. >But the vendors have to develop an awareness that the radiotherapy >department is getting very complicated now. No single vendor can truly >meet all the customers needs. They have to learn that a little >cooperation between competitors is not a bad thing. Hey, and we all know >they really do want us to be satisfied with their products. > >Just one more thing. As to the choice of Varian's Varis or Impac's >Impac, just remember that there is also Lantis from Siemens, RT Desktop >from Elekta and Visir from MDS Nordion. So look around a little. > >Sid Mauck >RT Exec > > > David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: <97546CB5812DD411BD8300508B6D77756C9114@ex2.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: aa2h@virginia.edu, linac-eng@plato1.aristotle.net Subject: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Wed, 16 May 2001 00:03:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Al, Welcome to the world of RT Desktop! Without a little more detail any suggestions would be a stab in the dark. A useful little trick to help with fault finding is to get the therapists to bring up the inhibits box (doubleclick on the inhibit area) and then to use the print screen function. This will give more information and can be very useful. From this information, it should be easier to work out which of the control areas is misbehaving. It may be worth looking at the SCC cards on the likely culprit, as we have had one of these become suspect. Hope this helps Stuart > -----Original Message----- > From: Al Aqualino [mailto:aa2h@virginia.edu] > Sent: 15 May 2001 21:41 > To: linac-eng@plato1.aristotle.net > Subject: Elekta RT Desktop: ?intermittent +/-15V err reports > > Approximately one month ago, we upgraded our 9 year > old Elekta SL-18 with MLC to run RT Desktop. The same week, > the therapists began telling me they were getting > intermittent 280 & 281 terminations (280 reports a fault in a > -15V supply, 281 in a + 15V supply). > I therefore would appreciate Elekta readers who run > RT Desktop asking their therapists directly if they have seen > these intermittent 280/281 errors. Probably best to respond > privately to me, so the list doesn't become crowded with > responses not everyone will care about. (I can summarize > responses to those interested.) > Thanks! > - Al > ~~~~~~~~~~~~~~~~~~~~~~~~~~ > Al Aqualino > U.Va. Radiological Physics > mailto:aa2h@virginia.edu > voice: 804-982-0781 > fax: 804-982-0792 > ~~~~~~~~~~~~~~~~~~~~~~~~~~ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: From: "Vroome, H. de (ONCO)" To: 'Al Aqualino' , "'linac-eng@plato1.aristotle.net'" Subject: RE: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Tue, 15 May 2001 23:22:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Al, This problem looks like similar problems on machines running RTDesktop also on new linacs. It has to do with a different way af sampling in the analog input boards. We had it on our oldest linac 007 with the air pressure readout i558, and the applicator code, on the latest 5661 it is bending fine. It becomes slightly better by replacing the sample and hold circuits. For Elekta it is an known problem. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Al Aqualino Sent: Tuesday, May 15, 2001 22:41 To: linac-eng@plato1.aristotle.net Subject: Elekta RT Desktop: ?intermittent +/-15V err reports Approximately one month ago, we upgraded our 9 year old Elekta SL-18 with MLC to run RT Desktop. The same week, the therapists began telling me they were getting intermittent 280 & 281 terminations (280 reports a fault in a -15V supply, 281 in a + 15V supply). As Elekta dudes know, there are 6 such power supplies, and the fault could arise from any of the 6. Watching these 2 items from service mode, none of the part 4 values ever appear to drop outside the part 19,20 set limits. Still, our Service rep kindly tried replacing the supply (part 104) operating closest to the limits. Problem persisted. He then replaced the next "worst" supply. Problem persisted. He tried changing part 10, to shift the level for the limits. Problem persisted. My intuition is that this actually is a software problem, whose appearance indeed correlates with the RT Desktop software installation. (I think I've heard that RT Desktop averages realtime error values differently than did the old software, to further minimize spurious error reports from noise. Since items 280/281 actually cycle between 6 different supply readings, it would have been easy for a software engineer to have made a coding error.) But when I ask Elekta service about this possibility, they respond that it can't be, because no other sites are reporting this problem. I think one possibility is that other sites are not reporting it because it's an error the therapists can clear at the treatment unit, and do a "finish beam" prescription, without telling anyone. I think most therapists are too busy to notify service about problems unless the problem downs the machine. I therefore would appreciate Elekta readers who run RT Desktop asking their therapists directly if they have seen these intermittent 280/281 errors. Probably best to respond privately to me, so the list doesn't become crowded with responses not everyone will care about. (I can summarize responses to those interested.) Thanks! - Al ~~~~~~~~~~~~~~~~~~~~~~~~~~ Al Aqualino U.Va. Radiological Physics mailto:aa2h@virginia.edu voice: 804-982-0781 fax: 804-982-0792 ~~~~~~~~~~~~~~~~~~~~~~~~~~ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: <01May16.082632bst.118083@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net, aa2h@virginia.edu Subject: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Tue, 15 May 2001 23:28:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Al, Yes, we've had intermittent +15v inhibits on 2 out of the 3 SLs we've had upgraded to RTD. We also beleive it is a function of the upgrade and the way that RTD handles the readback/ sampling. After monitoring the +-15v readback values, we did notice one operating close to the limit. After satisfying ourselves that the PSU was not at fault, we altered the Pt 19 or 20 by a small margin which did the trick. I beleive these 15v PSUs are only "nominally" 15v anyway and are further regulated locally to the system that they are supplying. Chris Chris Forrest Technical Specialist Medical Physics Service Cookridge Hospital Leeds, UK LS16 6QB Tel +44 113 392 4354 Fax +44 113 392 4122 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: From: Jan Kok To: aa2h@virginia.edu Cc: linac-eng@plato1.aristotle.net Subject: Re: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Tue, 15 May 2001 23:22:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Al, We have been the Beta site for RTD and in one of the pre-releases we had a similar problem. Not only the 15 Volt readout but also one of the pressure sensors gave an instable reading. It appeared that timing of the multiplexers was the course of the problem.In the Javelin samples were made on a regular base where the RTD makes MORE samples with the result that ripple on the analog signal produces samples with DIFFERENT values. As far as I can remember they made some changes to a sample and hold circuit. Strangely enough only one of our six linacs was effected by this problem? Let your local Elekta rep. phone Crawley. Cheers, Jan Kok ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: MLC Millennium Message-ID: <001f01c0dd9c$7449bc80$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: 'Jose Villegas' , linac-eng@plato1.aristotle.net Subject: RE: MLC Millennium Date: Tue, 15 May 2001 16:09:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable If you have a millennium MLC then you should have received a CDROM with = the entire manual in PDF format. Just bring it to a Kinko's (a franchise = printer in the US) and have a hard copy made. It also has other apps on the CD = but I'm not sure they're of much use. One is auto cycle which will probably = wear out your 120. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Jose Villegas Sent: Tuesday, May 15, 2001 2:11 PM To: linac-eng@plato1.aristotle.net Subject: MLC Millennium Hi colleagues, Do any one of you who attended to MLC Millennium school have the MLC system and maintenance guide part number? Varian support publication = Web page only shows the old 80 leaves number, and of course all courses are booked till next year. Thanks Jos=E9. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta RT Desktop: ?intermittent +/-15V err reports Message-ID: <5.1.0.14.2.20010515161232.00a72600@holmes.acc.virginia.edu> From: Al Aqualino To: linac-eng@plato1.aristotle.net Subject: Elekta RT Desktop: ?intermittent +/-15V err reports Date: Tue, 15 May 2001 12:40:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Approximately one month ago, we upgraded our 9 year old Elekta SL-18 with MLC to run RT Desktop. The same week, the therapists began telling me they were getting intermittent 280 & 281 terminations (280 reports a fault in a -15V supply, 281 in a + 15V supply). As Elekta dudes know, there are 6 such power supplies, and the fault could arise from any of the 6. Watching these 2 items from service mode, none of the part 4 values ever appear to drop outside the part 19,20 set limits. Still, our Service rep kindly tried replacing the supply (part 104) operating closest to the limits. Problem persisted. He then replaced the next "worst" supply. Problem persisted. He tried changing part 10, to shift the level for the limits. Problem persisted. My intuition is that this actually is a software problem, whose appearance indeed correlates with the RT Desktop software installation. (I think I've heard that RT Desktop averages realtime error values differently than did the old software, to further minimize spurious error reports from noise. Since items 280/281 actually cycle between 6 different supply readings, it would have been easy for a software engineer to have made a coding error.) But when I ask Elekta service about this possibility, they respond that it can't be, because no other sites are reporting this problem. I think one possibility is that other sites are not reporting it because it's an error the therapists can clear at the treatment unit, and do a "finish beam" prescription, without telling anyone. I think most therapists are too busy to notify service about problems unless the problem downs the machine. I therefore would appreciate Elekta readers who run RT Desktop asking their therapists directly if they have seen these intermittent 280/281 errors. Probably best to respond privately to me, so the list doesn't become crowded with responses not everyone will care about. (I can summarize responses to those interested.) Thanks! - Al ~~~~~~~~~~~~~~~~~~~~~~~~~~ Al Aqualino U.Va. Radiological Physics mailto:aa2h@virginia.edu voice: 804-982-0781 fax: 804-982-0792 ~~~~~~~~~~~~~~~~~~~~~~~~~~ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MLC Millennium Message-ID: <3B018B67.BAF31F@yale.edu> From: "Peter E. Vitali" To: Jose Villegas Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC Millennium Date: Tue, 15 May 2001 12:04:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jose: The Technical Maintenance Guide has no number. You can probably only get it at the School. The Millennium MLC Databook from the school has the number 01105303-03/Education. It is basically the same databook you get with the MLC with some updated pages but some pages missing. The MLC Databook number is 1105303-01 Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MLC Millennium Message-ID: From: Jose Villegas To: linac-eng@plato1.aristotle.net Subject: MLC Millennium Date: Tue, 15 May 2001 10:11:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi colleagues, Do any one of you who attended to MLC Millennium school have the MLC system and maintenance guide part number? Varian support publication = Web=20 page only shows the old 80 leaves number, and of course all courses are = booked till next year. Thanks Jos=E9. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Symmetry on Elekta SL20 Message-ID: From: Frank Spitz To: DMason@bccancer.bc.ca Cc: linac-eng@plato1.aristotle.net Subject: Symmetry on Elekta SL20 Date: Tue, 15 May 2001 07:22:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Several checks come to mind to try and resolve your 2T steering problem. 1.) Verify your 2T Current supply has a variable output by watching Item 422 2T I MON change as you vary item 365 2T I CNTRL. Years ago I was duped into thinking my 2T supply was working fine since Part 4 (read back part) of item 365 2RI CNTRL varied as I moved item 365 Part 1 (set part). Part 4 of Item 365 verifies the control setting not the actual 2T Current monitor. The problem I had was with a faulty driver PCB 15 N which fed the 2T Steering coils a constant current. Give this a check but since you seem to have reasonable steering with other energies the 2T supply is probably good. 2.) Check the Gantry course Pot. The gantry course pot item 760 part 4 is used as an input to the 2T servo to verify 2T steering with respect to Gantry angle. You may have a pot with a bad spot. Check the Gantry course pot voltage as you rotate the gantry look for the same discontinuity. I would suspect however that if the Course pot was real bad then the check pot would not agree and you would see occasional Check pot error or cross correlation errors. 3.) Check 2T MON and 2TI MON as you rotate the gantry both with the beam on and the beam off. At each corresponding gantry angle the currents should be the same. If not then something with the beam is throwing the current off. Likely suspects are the Gun servo, Bending servos, or maybe the RF noise from the Magnetron. 4.) With beam on watch the Gun servo and Bending course and bending fine servos as you move the gantry. Look for corresponding changes in gun current and Bending current with changes in 2T. 5.) Check your Gun current run values. As the gun get older the filament becomes thinner thus requiring a smaller current for the filament to reach its working temperature to emit the desired amount of electrons. If you gun is more then 5 years old then you might consider replacement. I would say gun currents 6.5 to 7.0 are a bit low. Currents 6.0 to 6.5 are very low. Maybe some other Elekta users out there could comment on minimum gun current values indicating gun replacement. I do know for certain that as the gun filament wears thin it will affect with gantry angle: Beam startup, 2R, and 2T steering. You might also check your gun filament connections. I've seen them come loose causing similar steering problems. Hope this helps, got to go fix a machine. Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Symmetry on Elekta SL20 Message-ID: <20010515.085046.-573949.0.ramsay.young@juno.com> From: Ramsay Young To: Chrisf@ulth.northy.nhs.uk Cc: linac-eng@plato1.aristotle.net Subject: Re: Symmetry on Elekta SL20 Date: Tue, 15 May 2001 05:50:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would think the most likely problem would be with the scanning equipment. Failing that there could be a floppy filament etc. You would need to know that other symptoms there are. The LUT's can and in my opinion should be edited for a smooth sine wave. When setting them some people like to up the gain and do a learn enable but call me old fashioned I like to do it by hand every 20 or so degrees with the beam in manual steering. Once the table is in there, and there is a high and low lookup table therefore if the problem is in both energies I would not suspect the lookup tables, any change in the steering current result in an offset of the LUT only. If there is only an error in the AB then a mechanical problem with the filter system would be a good bet as the flatness would change in the GT but symmetry should not. Ramsay Young Huntsville Hospital Cell - 256.990.5293 Voice Mail/Phone - 256.517.6965 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Symmetry on Elekta SL20 Message-ID: <01May15.140011bst.118101@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Re: Symmetry on Elekta SL20 Date: Tue, 15 May 2001 05:02:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Darcy, Assuming that your symmetry is OK at Gantry 0, if you rotate the gantry to the "problem" angle - can you adjust the error out by adjusting 2T control? If you can, then it is possible that there MAY a problem with the lookup system. For some reason, the correction data required to bring the beam into good symmetry is either not being detected or stored correctly during the learn phase. (Bad chamber, erratic gantry speed etc?) On the other hand, I don't see sudden jumps in symmetry as a LUT problem (unless you have a obvious spike in the LUTsinecos curve !) A more likely explanation, following Jan's line of thought, is that you might have something loose up there (collimator - not an inference to your state of mind) which may explain the sudden discontinuity and apparent hysteresis. Finally , if you can't tweak it out with 2T control (unlikey with around 2%) , then there's not much chance that the LUTwill be able to either! All the best, Chris Chris Forrest Technical Specialist Medical Physics Service Cookridge Hospital Leeds, UK LS16 6QB Tel +44 113 392 4354 Fax +44 113 392 4122 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Symmetry on Elekta SL20 Message-ID: <97546CB5812DD411BD8300508B6D77756C9112@ex2.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: Tom.Feuerstake@rmp.uhn.on.ca, linac-eng@plato1.aristotle.net, DMason@bccancer.bc.ca Cc: kok@radth.ruu.nl Subject: RE: Symmetry on Elekta SL20 Date: Tue, 15 May 2001 00:58:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Darcy, From your description of the problem, I agree with Jan that it sounds like a mechanical slop rather than a steering problem. I seem to remember something like this happening in the factory during my time there. As I remember it was due to slop in the HP phase shifter. I would check this by rotating the gantry whilst standing behind the partition and both listen and watch for any obvious clunks and/or movements. If you plot doserate against gantry angle, I suspect that you will see these step jumps on this fairly obviously (this will give you a good idea of the points that the movement is occurring at). Hope this helps, and please let us know your solution when you find it Regards Stuart > -----Original Message----- > From: Jan Kok [mailto:kok@radth.ruu.nl] > Sent: 15 May 2001 07:22 > To: DMason@bccancer.bc.ca > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Symmetry on Elekta SL20 >I think we had the same problem a few years ago. Every now and than a >2T error. When measuring the symmetry we discovered a steep slope at >the centre of the field (in the AB plane). It appeared to be a problem >with the locking mechanism of the secondary filter system. As you are >having problems with the X18 I would check the primary filter >mechanism as well. > >Good luck > > >Jan Kok > > -----Original Message----- > From: Feuerstake, Tom [mailto:Tom.Feuerstake@rmp.uhn.on.ca] > Sent: 14 May 2001 22:09 > To: 'linac-eng@plato.aristotle.net' > Subject: RE: Symmetry on Elekta SL20 > > > Yes there is some interaction between the 2R servo and the 2T flatness. We > see this on our SL25's, which are essentially the same as your SL20, I > think. Just a different bending magnet setting or something like that. Both > units also run the same or very similar software, so I'll tell you what I > know about the 2T servo values on the SL25. At any given gantry angle, you > should switch off the 2R servo and steer the beam in the radial and > transverse plane using the 2R and 2T magnet coils. This assumes you have > already optimised the beam by adjusting the focussing, 1R and 1T coils and > also the "gun rotation" (if you're gutsy enough to do this one). Anyway, by > saving the data using SAVE ENERGY at the various angles you like, the start > value of the 2R servo and the running value of the 2T coil (since it is not > a servo!) are saved in the look up tables. Note: it often helps to keep the > 2R servo ON when setting up the 2T values, as it will ensure that the 2R > error is very low. If there is a 2R error while trying to zero the 2T, then > you will get a bad 2T value once you turn on the 2R servo again, because it > steers the beam a little bit in the diagonal. Get it? Hope that's helpful. > The only other thing I can throw in is, small changes in the AFC can also > move the beam without causing a big loss in doserate. You have to use > "feel", like with an old cranky carburettor, but it's so much fun when it > finally works! > You shouldn't mess with the tables manually too much. Once they are > characterised (which depends on the magnetic environment in the room) they > rarely need to be changed. If your tables are really shot, reload from a > backup or call your Elekta service rep. > Good Luck > Tom Feuerstake > PMH Toronto > > -----Original Message----- > From: Darcy Mason [SMTP:DMason@bccancer.bc.ca] > Sent: Monday, May 14, 2001 2:54 PM > To: 'linac-eng@plato.aristotle.net' > Subject: Symmetry on Elekta SL20 > > I'm new to this list, so I hope this question is on target. This is > an unusual situation, and we are hoping that someone has some insight into > this problem. > > We are having problems with symmetry on one of our Elekta SL20 > linacs. As background, the story we have been told is that the automatic > servo is usually turned OFF for the 2T plane (cross-plane). Then there is a > look-up table (LUT) which sets a good start value for the 2T I ctrl settings > as a function of gantry angle, which determines the start-point steering. > > Using a Profiler device mounted in the shielding tray slot, we have > found that the 2T symmetry changes with gantry angle quite a bit. In > particular, our symmetry was poor at gantry 90, 18 MV. Then, during routine > QA, it was found to suddenly get worse by an additional 2%, and has stayed > there. The 6MV mode, and the inplane all show changes in symmetry at about > the same time. The one that concerns us is the 18 MV cross-plane at gantry > 90, where an already unacceptable symmetry got worse by 2%. > > So, we thought to edit the look-up table to correct that. There is > a configuration procedure, where the unit captures symmetry info while you > rotate through -180 to 180, and creates the LUT for you. We tried this but > it did not work well, or even reproducibly. Then, we edited the LUT by hand > to get good symmetry at discrete angles, and interpolated in between (this > also made the LUT shape similar to our other SL20 unit where the symmetry > problems are not as bad). The short story is that this hand-edit made > matters much worse. In particular, it created an odd "discontinuity" in the > symmetry captured by the Profiler as we arced. At a particular gantry > angle, the symmetry suddenly shifted dramatically, stayed there for a while, > then shifted suddenly back to where it was. The sudden jumps were not at > the same gantry angle when rotating clockwise as compared with rotating > counter-clockwise. Another piece of info is that for the INplane, a spike > in the symmetry occurs at the exact same angle, but quickly goes back, > presumably because of the servo action in that direction. We > don't know which is cause, and which is effect. > > So, we are going back to our original LUT, but have still not solved > the original problem. Anyone have any insight into this?? > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Symmetry on Elekta SL20 Message-ID: From: Jan Kok To: DMason@bccancer.bc.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Symmetry on Elekta SL20 Date: Mon, 14 May 2001 22:22:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Darcy, Welcome to the list. I think we had the same problem a few years ago. Every now and than a 2T error. When measuring the symmetry we discovered a steep slope at the centre of the field (in the AB plane). It appeared to be a problem with the locking mechanism of the secondary filter system. As you are having problems with the X18 I would check the primary filter mechanism as well. Good luck Jan Kok ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Symmetry on Elekta SL20 Message-ID: From: "Feuerstake, Tom" To: "'linac-eng@plato.aristotle.net'" Subject: RE: Symmetry on Elekta SL20 Date: Mon, 14 May 2001 13:09:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes there is some interaction between the 2R servo and the 2T flatness. We see this on our SL25's, which are essentially the same as your SL20, I think. Just a different bending magnet setting or something like that. Both units also run the same or very similar software, so I'll tell you what I know about the 2T servo values on the SL25. At any given gantry angle, you should switch off the 2R servo and steer the beam in the radial and transverse plane using the 2R and 2T magnet coils. This assumes you have already optimised the beam by adjusting the focussing, 1R and 1T coils and also the "gun rotation" (if you're gutsy enough to do this one). Anyway, by saving the data using SAVE ENERGY at the various angles you like, the start value of the 2R servo and the running value of the 2T coil (since it is not a servo!) are saved in the look up tables. Note: it often helps to keep the 2R servo ON when setting up the 2T values, as it will ensure that the 2R error is very low. If there is a 2R error while trying to zero the 2T, then you will get a bad 2T value once you turn on the 2R servo again, because it steers the beam a little bit in the diagonal. Get it? Hope that's helpful. The only other thing I can throw in is, small changes in the AFC can also move the beam without causing a big loss in doserate. You have to use "feel", like with an old cranky carburettor, but it's so much fun when it finally works! You shouldn't mess with the tables manually too much. Once they are characterised (which depends on the magnetic environment in the room) they rarely need to be changed. If your tables are really shot, reload from a backup or call your Elekta service rep. Good Luck Tom Feuerstake PMH Toronto -----Original Message----- From: Darcy Mason [SMTP:DMason@bccancer.bc.ca] Sent: Monday, May 14, 2001 2:54 PM To: 'linac-eng@plato.aristotle.net' Subject: Symmetry on Elekta SL20 I'm new to this list, so I hope this question is on target. This is an unusual situation, and we are hoping that someone has some insight into this problem. We are having problems with symmetry on one of our Elekta SL20 linacs. As background, the story we have been told is that the automatic servo is usually turned OFF for the 2T plane (cross-plane). Then there is a look-up table (LUT) which sets a good start value for the 2T I ctrl settings as a function of gantry angle, which determines the start-point steering. Using a Profiler device mounted in the shielding tray slot, we have found that the 2T symmetry changes with gantry angle quite a bit. In particular, our symmetry was poor at gantry 90, 18 MV. Then, during routine QA, it was found to suddenly get worse by an additional 2%, and has stayed there. The 6MV mode, and the inplane all show changes in symmetry at about the same time. The one that concerns us is the 18 MV cross-plane at gantry 90, where an already unacceptable symmetry got worse by 2%. So, we thought to edit the look-up table to correct that. There is a configuration procedure, where the unit captures symmetry info while you rotate through -180 to 180, and creates the LUT for you. We tried this but it did not work well, or even reproducibly. Then, we edited the LUT by hand to get good symmetry at discrete angles, and interpolated in between (this also made the LUT shape similar to our other SL20 unit where the symmetry problems are not as bad). The short story is that this hand-edit made matters much worse. In particular, it created an odd "discontinuity" in the symmetry captured by the Profiler as we arced. At a particular gantry angle, the symmetry suddenly shifted dramatically, stayed there for a while, then shifted suddenly back to where it was. The sudden jumps were not at the same gantry angle when rotating clockwise as compared with rotating counter-clockwise. Another piece of info is that for the INplane, a spike in the symmetry occurs at the exact same angle, but quickly goes back, presumably because of the servo action in that direction. We don't know which is cause, and which is effect. So, we are going back to our original LUT, but have still not solved the original problem. Anyone have any insight into this?? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Symmetry on Elekta SL20 Message-ID: <32BB029387A6D4118C7F00C00D00433114303F@MBPCC_EXCHANGE> From: "Hidalgo, Dr Oscar" To: 'Darcy Mason' , "'linac-eng@plato.aristotle.net'" Subject: RE: Symmetry on Elekta SL20 Date: Mon, 14 May 2001 12:11:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to ask you a couple of questions. How is the symmetry defined by the profiler? And was the flatness of the profiles changing also? -----Original Message----- From: Darcy Mason [SMTP:DMason@bccancer.bc.ca] Sent: Monday, May 14, 2001 1:54 PM To: 'linac-eng@plato.aristotle.net' Subject: Symmetry on Elekta SL20 I'm new to this list, so I hope this question is on target. This is an unusual situation, and we are hoping that someone has some insight into this problem. We are having problems with symmetry on one of our Elekta SL20 linacs. As background, the story we have been told is that the automatic servo is usually turned OFF for the 2T plane (cross-plane). Then there is a look-up table (LUT) which sets a good start value for the 2T I ctrl settings as a function of gantry angle, which determines the start-point steering. Using a Profiler device mounted in the shielding tray slot, we have found that the 2T symmetry changes with gantry angle quite a bit. In particular, our symmetry was poor at gantry 90, 18 MV. Then, during routine QA, it was found to suddenly get worse by an additional 2%, and has stayed there. The 6MV mode, and the inplane all show changes in symmetry at about the same time. The one that concerns us is the 18 MV cross-plane at gantry 90, where an already unacceptable symmetry got worse by 2%. So, we thought to edit the look-up table to correct that. There is a configuration procedure, where the unit captures symmetry info while you rotate through -180 to 180, and creates the LUT for you. We tried this but it did not work well, or even reproducibly. Then, we edited the LUT by hand to get good symmetry at discrete angles, and interpolated in between (this also made the LUT shape similar to our other SL20 unit where the symmetry problems are not as bad). The short story is that this hand-edit made matters much worse. In particular, it created an odd "discontinuity" in the symmetry captured by the Profiler as we arced. At a particular gantry angle, the symmetry suddenly shifted dramatically, stayed there for a while, then shifted suddenly back to where it was. The sudden jumps were not at the same gantry angle when rotating clockwise as compared with rotating counter-clockwise. Another piece of info is that for the INplane, a spike in the symmetry occurs at the exact same angle, but quickly goes back, presumably because of the servo action in that direction. We don't know which is cause, and which is effect. So, we are going back to our original LUT, but have still not solved the original problem. Anyone have any insight into this?? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C on a UPS Message-ID: From: Ray.VanAusdal@mjh.org To: "Ukos, John" Cc: "Linac (E-mail)" Subject: Re: Varian 2100C on a UPS Date: Mon, 14 May 2001 12:05:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am interested in the same question. Still, I prefer to have the therapists turn off the beam so that the patient is not treated with the lights flickering and the therapists are flustered. Then, I still want the machine to be on and not throw the breaker and put us into time delay. I also like the idea that the machine will not go down in the middle of the night. I am a lso interested in its value as a power conditioner or surge protector. Finally, I am interested in knowing how the emergency off breaker is wired. I still want that to work. Ray Van Ausdal "Ukos, John" Sent by: owner-linac-eng@plato1.aristotle.net 05/14/01 02:00 PM To: "Linac (E-mail)" cc: Subject: Varian 2100C on a UPS I have seen posting regarding UPS systems for Linacs so I'm hoping that wealth of knowledge will surface again. We are looking at installing these systems for machines that are to be installed. Please share the good the bad and the ugly with me. In particular can anyone tell me approximately how much beam (if any) a 2100c can run on a UPS (approx. given different makes and models). I would also be interested in the type(make,model) of systems that you have. John Ukos ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Symmetry on Elekta SL20 Message-ID: <6BAF4D075F07D411B30900508B94CBA003486776@SERVER20> From: Darcy Mason To: "'linac-eng@plato.aristotle.net'" Subject: Symmetry on Elekta SL20 Date: Mon, 14 May 2001 10:54:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm new to this list, so I hope this question is on target. This is an unusual situation, and we are hoping that someone has some insight into this problem. We are having problems with symmetry on one of our Elekta SL20 linacs. As background, the story we have been told is that the automatic servo is usually turned OFF for the 2T plane (cross-plane). Then there is a look-up table (LUT) which sets a good start value for the 2T I ctrl settings as a function of gantry angle, which determines the start-point steering. Using a Profiler device mounted in the shielding tray slot, we have found that the 2T symmetry changes with gantry angle quite a bit. In particular, our symmetry was poor at gantry 90, 18 MV. Then, during routine QA, it was found to suddenly get worse by an additional 2%, and has stayed there. The 6MV mode, and the inplane all show changes in symmetry at about the same time. The one that concerns us is the 18 MV cross-plane at gantry 90, where an already unacceptable symmetry got worse by 2%. So, we thought to edit the look-up table to correct that. There is a configuration procedure, where the unit captures symmetry info while you rotate through -180 to 180, and creates the LUT for you. We tried this but it did not work well, or even reproducibly. Then, we edited the LUT by hand to get good symmetry at discrete angles, and interpolated in between (this also made the LUT shape similar to our other SL20 unit where the symmetry problems are not as bad). The short story is that this hand-edit made matters much worse. In particular, it created an odd "discontinuity" in the symmetry captured by the Profiler as we arced. At a particular gantry angle, the symmetry suddenly shifted dramatically, stayed there for a while, then shifted suddenly back to where it was. The sudden jumps were not at the same gantry angle when rotating clockwise as compared with rotating counter-clockwise. Another piece of info is that for the INplane, a spike in the symmetry occurs at the exact same angle, but quickly goes back, presumably because of the servo action in that direction. We don't know which is cause, and which is effect. So, we are going back to our original LUT, but have still not solved the original problem. Anyone have any insight into this?? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100C on a UPS Message-ID: <9C688FB52A05D51194750002B325B5F7340F09@HRCCEX> From: "Ukos, John" To: "Linac (E-mail)" Subject: Varian 2100C on a UPS Date: Mon, 14 May 2001 10:00:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have seen posting regarding UPS systems for Linacs so I'm hoping that wealth of knowledge will surface again. We are looking at installing these systems for machines that are to be installed. Please share the good the bad and the ugly with me. In particular can anyone tell me approximately how much beam (if any) a 2100c can run on a UPS (approx. given different makes and models). I would also be interested in the type(make,model) of systems that you have. John Ukos ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: plastic MLC nuts. Message-ID: From: graham freestone To: linac-eng@plato1.aristotle.net Subject: Re: plastic MLC nuts. Date: Fri, 11 May 2001 16:27:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear All, Just had a chat with someone who has worked with Millenium MLC's: apparently the nuts are made of plastic that is designed to split under load rather than bend the lead screws. This would sound like the main design feature rather than radiation damage considerations, as the doses are not that high. Graham Freestone _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian IMRT and IMPAC Message-ID: <01C0DA3A.95195E80.daveb@nshs.edu> From: "David Bisciotti, MSc" To: "'impac-users@wfubmc.edu'" , "Linac-Engineers Server (E-mail)" Subject: RE: Varian IMRT and IMPAC Date: Fri, 11 May 2001 12:51:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Much has been said as to the problems using IMPAC with the Varian MLCs...Most of it Unfounded! To date, we have had only normal computer issues (lockups ect..). I cannot say with out a doubt whether the problem was on the IMPAC or the Varian side...But, I can say that Varian has recently put out new console software that "fixed" a lot of the "quirky" behaviors we have seen in the past ( the same behaviors that we couldn't determine where the problem originated, VARIAN or IMPAC) Hmmm...IMPAC didn't change their software and now things work better....Hmm.. -----Original Message----- From: Chester R. Ramsey [SMTP:medphys@bellsouth.net] Sent: Friday, May 11, 2001 3:39 PM To: impac-users@wfubmc.edu Subject: Varian IMRT and IMPAC According to the Varian people, there are interface issues between IMPAC and the Varian MLC control computer. As you might imagine, their recommended solution is to buy VARiS if you want to treat with IMRT. Does anyone have any experience delivering IMRT treatments with Varian MLCs using IMPAC? Chester Ramsey ================================ Chester R. Ramsey, Ph.D. Thompson Cancer Survival Center Knoxville, Tennessee 865-374-3813 ================================ ======================================================================== =============== This list is for users of IMPAC Medical Systems Multi-ACCESS software application. The purpose of the list is for the sharing of knowledge and experiences while using the Multi-ACCESS system. Subscribers will be removed from the list (at the list owners discretion) that choose not to use this list in a constructive way. This list is NOT in any way supported, sponsored by, or affiliated with IMPAC Medical System, Inc. ======================================================================== =============== ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Coolingwater valve Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF99C@phsexch6.partners.org> From: "Maddox, Buford J" To: 'David Burgess ' , linac-eng@plato1.aristotle.net, CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: RE: Coolingwater valve Date: Fri, 11 May 2001 10:06:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I think the sensor is an RTD (platinum?). Linear, 1000 ohm, few ohms per deg change, industry standard. Gas and water leaks may appear at the low temperatures. > -----Original Message----- > From: David Burgess [SMTP:CCWDB@qe2-hsc.ns.ca] > Sent: Friday, May 11, 2001 8:45 AM > To: linac-eng@plato1.aristotle.net; CJ.de.Bruijne@walcheren.ziekenhuis.nl > Subject: Re: Coolingwater valve > > Hi Keesjan, > > Yes, there is a lot of experience with this type of problem from the 3-way > brass valve. Varian have available an improved stainleess steel valve which is > supposed to last longer. > > We have removed the 3-way valve, the Barber Colman valve actuator, and the > Barber Colman temperature controller from 2100CD s/n 1025, and custom made a > system using an ASCO solenoid valve. The ASCO valve can be serviced without > removal from the plumbing > ( the ASCO valve has 4 removeable screws, a cheap re-build kit, a good > estimated life span). Also, the entire custom device is cheap. We've been > running for 3 months and no trouble. We now plan ( and are currently > assembling) 3 more custom kits and will c > onvert 2 LE's and 1 more HE, this summer. > > The custom made unit uses the same thermistor as is currently in the HE's and > interfaces directly to temperature read out and uses cont.Pwr 2 from TB2, just > as the Barber Colman did. > > Eventually I'll put the fabrication drawings, parts list, engineering notes, > etc, out to this group. > > David Burgess > > Nova Scotia Cancer Centre > > >>> 5/11/2001 7:34:51 AM >>> > Hi colleagues, > > Our Cl.2100C s/n 417 has develloped a sympton of low temp. > in the morning. (about 32 centgrade) > We think this is because the cooling valve doesn't close complete. > After switching from 'standby' to 'on' the temp. is good within 5 minutes. > > Two questions: > - does any of you have experience with this kind of problem? > - who knows a good second source for the valve? > > Regards, > > Keesjan de Bruijne > Ziekenhuis Walcheren > Vlissingen, the Netherlands > afd. DIA > cj.de.bruijne@walcheren.ziekenhuis.nl > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Vacancy for Radiotherapy Engineer MTO4 at UCLH/Middlesex Message-ID: <001701c0da39$646b5280$75e82880@medphys.ucl.ac.uk> From: Ivan Rosenberg Reply-To: ivan To: 'medphys-UK' , 'Linac Eng List' Cc: 'Jem Hebden' Subject: Vacancy for Radiotherapy Engineer MTO4 at UCLH/Middlesex Date: Fri, 11 May 2001 08:42:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This ad should appear on the IPEM bulletin of 16 May 2001 with Reference No.CL/800 and a Closing Date of 1 June 2001. UCL Hospitals The Meyerstein Institute of Oncology Radiotherapy Physics Section Radiotherapy Equipment Engineer MTO4 We require an experienced Radiotherapy Equipment Engineer to join the team who support our linear accelerators and other equipment. The post offers the opportunity to work in a busy radiotherapy centre where significant developments are taking place. At present, we have two Elekta linear accelerators, two Varian Linear Accelerators with MLC and EPID and another Varian being installed at the moment, plus a MicroSelectron brachytherapy unit, 2 tele-therapy units, orthovoltage and superficial units, and 2 simulators. The successful candidate for this post will have extensive experience supporting radiation-based equipment, including linear accelerators and associated software. Training will be given on machines where experience is lacking. First-class fault-finding skills are required, as is the capability of working with minimal supervision and team working. Flexibility in work hours is essential. The post is graded MTO 4 (salary range #24,195 to #27,881, including LW), For further information concerning this post, please contact Mr John McKechnie, Chief Radiotherapy Engineer on 0171-380 9700, email jmck@medphys.ucl.ac.uk or Dr Ivan Rosenberg, Head of Radiotherapy Physics Section email ivan@medphys.ucl.ac.uk. For an application form and job description, please contact the Personnel Department, University College Hospital, Vesey Strong Building, 112 Hampstead Road, London NW1 2LT or telephone 020-7-380 9166 (24 hour answer phone) quoting Reference No. CL/800 Closing Date: 1 June 2001 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MTO4 Vacancy Message-ID: <3.0.2.32.20010511164310.009233b0@pop3-server> From: John McKechnie To: linac-eng@plato1.aristotle.net Cc: ivan@medphys.ucl.ac.uk Subject: MTO4 Vacancy Date: Fri, 11 May 2001 07:43:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Hello to the list, Please see the attached job advert. If anyone is interested, please quote reference number CL/800 in any correspondance. The closing date is 1st June 2001. 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//////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// /////////////////////wEA/v8DCgAA/////wYJAgAAAAAAwAAAAAAAAEYYAAAATWljcm9zb2Z0 IFdvcmQgRG9jdW1lbnQACgAAAE1TV29yZERvYwAQAAAAV29yZC5Eb2N1bWVudC44APQ5snEAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAA ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; name="ATT41935.txt" Content-Disposition: attachment; filename="ATT41935.txt" John McKechnie Chief Radiotherapy Engineer Medical Physics Middlesex Hospital London W1N 8AA tel. 020 7380 9700 fax. 020 7380 9111 ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Coolingwater valve Message-ID: <86256A49.00522FA5.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: "Carl \"Randy\" La Foone" Cc: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: RE: Coolingwater valve Date: Fri, 11 May 2001 06:55:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" No plug intended? 10 out of the 12 lines of your post were a blatant advertisement. Tim Waldron "Carl \"Randy\" La Foone" on 05/11/2001 07:54:16 AM To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net cc: (bcc: Timothy J. Waldron/MDACC) Subject: RE: Coolingwater valve Keesjan, You are more than likely correct in your assumption that the valve is no longer seating correctly. The O'ring seal may have broken down, etc. Replacement valves are available of course (no plug intended), but due to the redesign of the valve recently, it's highly recommended you replace the linkage kit which is also a slightly different style than originally used. Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of CJ.de.Bruijne@walcheren.ziekenhuis.nl Sent: Friday, May 11, 2001 5:35 AM To: linac-eng@plato1.aristotle.net Subject: Coolingwater valve Hi colleagues, Our Cl.2100C s/n 417 has develloped a sympton of low temp. in the morning. (about 32 centgrade) We think this is because the cooling valve doesn't close complete. After switching from 'standby' to 'on' the temp. is good within 5 minutes. Two questions: - does any of you have experience with this kind of problem? - who knows a good second source for the valve? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: plastic MLC nuts. Message-ID: From: Richard Gerler To: Dave.Pinchin@cdhb.govt.nz, linac-eng@plato1.aristotle.net Subject: Re: plastic MLC nuts. Date: Fri, 11 May 2001 05:03:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Having just come from Millenium MLC Class, it is still fresh in my mind that the "plastic" nuts on the millenium MLC are made of PolyEther Ether Keytone, which I'm sure was selected for its characteristics under radiation. >>> "Dave Pinchin" 05/10 5:00 PM >>> G'day, Sorry if I've confused you all. What I was hoping to convey was a suspicion that plastics can change shape in radiation areas. Graham Freestone confirms this. > Materials do suffer radiation damage, generally causing them to swell: (a> figure from the past in my Msc course was 'Mega Rads', If so then perhaps the idea of using precision plastic nuts in an MLC environment is a problem waiting to happen. Refer to the list entry from David Fenn on 9 May. > The nuts were found to be made from a plastic material, > (which raised a few eyebrows for what is supposed to be a "precision" > component pair!). Each had one stiff spot along it's length and when the > screw diameter was measured with a micrometer, the diameter was > greater by 2-4thou at the stiff spot. Presumably this worked when new. So what had changed????? Personally, I have never even seen a millenium MLC. So this line of thought might not be worth the paper that it's not written on. It might be worthwhile for millenium MLC sites to chase Varian on this one. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Coolingwater valve Message-ID: From: "Carl \"Randy\" La Foone" To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: RE: Coolingwater valve Date: Fri, 11 May 2001 04:54:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Keesjan, You are more than likely correct in your assumption that the valve is no longer seating correctly. The O'ring seal may have broken down, etc. Replacement valves are available of course (no plug intended), but due to the redesign of the valve recently, it's highly recommended you replace the linkage kit which is also a slightly different style than originally used. Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of CJ.de.Bruijne@walcheren.ziekenhuis.nl Sent: Friday, May 11, 2001 5:35 AM To: linac-eng@plato1.aristotle.net Subject: Coolingwater valve Hi colleagues, Our Cl.2100C s/n 417 has develloped a sympton of low temp. in the morning. (about 32 centgrade) We think this is because the cooling valve doesn't close complete. After switching from 'standby' to 'on' the temp. is good within 5 minutes. Two questions: - does any of you have experience with this kind of problem? - who knows a good second source for the valve? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Coolingwater valve Message-ID: <001e01c0da1a$53def760$0100a8c0@mshome.net> From: Richard Kimball To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Re: Coolingwater valve Date: Fri, 11 May 2001 05:00:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Keesjan, > Our Cl.2100C s/n 417 has develloped a sympton of low temp. > in the morning. (about 32 centgrade) Your morning low temp is not an uncommon problem. > We think this is because the cooling valve doesn't close complete. > After switching from 'standby' to 'on' the temp. is good within 5 minutes. I think so too! > Two questions: > - does any of you have experience with this kind of problem? Yes.....change the 3 way valve. > - who knows a good second source for the valve? Of course....Radparts.com carries these in stock! > > Regards, > > Keesjan de Bruijne > Ziekenhuis Walcheren > Vlissingen, the Netherlands > afd. DIA > cj.de.bruijne@walcheren.ziekenhuis.nl Same to you... Rich Kimball Acceletronics Midwest > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: plastic MLC nuts. Message-ID: <941fa1b8658c126a77c75d1ea9fe09963afbe1c5@mkoc.demon.co.uk> From: David Fenn To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: plastic MLC nuts. Date: Fri, 11 May 2001 04:55:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dave! Thanks for quoting me! Our feeling was that the fault lay with the leadscrew in this instance as it was not a constant diameter. I fully agree that plastics in a radiation environment have to be viewed with caution, but if we were seeing radiation damage to the nuts I would expect to see a worse situation on a 2100 than to a 600! This is not so in our case. The reason for my (somewhat flipant) comment about matched pairs was purely on financial grounds!! best regards David Fenn Kent Oncology Cetre MAIDSTONE UK -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Dave Pinchin Sent: 10 May 2001 23:00 To: linac-eng@plato1.aristotle.net Subject: plastic MLC nuts. G'day, Sorry if I've confused you all. What I was hoping to convey was a suspicion that plastics can change shape in radiation areas. Graham Freestone confirms this. > Materials do suffer radiation damage, generally causing them to swell: (a> figure from the past in my Msc course was 'Mega Rads', If so then perhaps the idea of using precision plastic nuts in an MLC environment is a problem waiting to happen. Refer to the list entry from David Fenn on 9 May. > The nuts were found to be made from a plastic material, > (which raised a few eyebrows for what is supposed to be a "precision" > component pair!). Each had one stiff spot along it's length and when the > screw diameter was measured with a micrometer, the diameter was > greater by 2-4thou at the stiff spot. Presumably this worked when new. So what had changed????? Personally, I have never even seen a millenium MLC. So this line of thought might not be worth the paper that it's not written on. It might be worthwhile for millenium MLC sites to chase Varian on this one. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Coolingwater valve Message-ID: <3AFBE01A.5384AA21@yale.edu> From: "Peter E. Vitali" To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: Coolingwater valve Date: Fri, 11 May 2001 04:50:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Keesjan: We have 2100C/D 408 so I would suspect that the cooling system is the same. The unit we have was Manufactured by Barber-Colman. Some time in the past they either sold this portion of the company or were taken over by a company called Seebe. Barber-Colman has a web site under this name but it is for their AreoSpace division. The AreoSpace Company makes temperature controls for Airplanes and other flying vehicles. There is a repair depot listed for France. Here in the USA I purchase the Barber-Colman parts from a local environmental control company. I would suspect that you could use any manufactures control system as long as it mechanically and electrically are compatible. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Coolingwater valve Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net, CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: Re: Coolingwater valve Date: Fri, 11 May 2001 04:44:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Keesjan, Yes, there is a lot of experience with this type of problem from the 3-way brass valve. Varian have available an improved stainleess steel valve which is supposed to last longer. We have removed the 3-way valve, the Barber Colman valve actuator, and the Barber Colman temperature controller from 2100CD s/n 1025, and custom made a system using an ASCO solenoid valve. The ASCO valve can be serviced without removal from the plumbing ( the ASCO valve has 4 removeable screws, a cheap re-build kit, a good estimated life span). Also, the entire custom device is cheap. We've been running for 3 months and no trouble. We now plan ( and are currently assembling) 3 more custom kits and will convert 2 LE's and 1 more HE, this summer. The custom made unit uses the same thermistor as is currently in the HE's and interfaces directly to temperature read out and uses cont.Pwr 2 from TB2, just as the Barber Colman did. Eventually I'll put the fabrication drawings, parts list, engineering notes, etc, out to this group. David Burgess Nova Scotia Cancer Centre >>> 5/11/2001 7:34:51 AM >>> Hi colleagues, Our Cl.2100C s/n 417 has develloped a sympton of low temp. in the morning. (about 32 centgrade) We think this is because the cooling valve doesn't close complete. After switching from 'standby' to 'on' the temp. is good within 5 minutes. Two questions: - does any of you have experience with this kind of problem? - who knows a good second source for the valve? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Coolingwater valve Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Coolingwater valve Date: Fri, 11 May 2001 02:34:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi colleagues, Our Cl.2100C s/n 417 has develloped a sympton of low temp. in the morning. (about 32 centgrade) We think this is because the cooling valve doesn't close complete. After switching from 'standby' to 'on' the temp. is good within 5 minutes. Two questions: - does any of you have experience with this kind of problem? - who knows a good second source for the valve? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: plastic MLC nuts. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: plastic MLC nuts. Date: Thu, 10 May 2001 14:00:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Sorry if I've confused you all. What I was hoping to convey was a suspicion that plastics can change shape in radiation areas. Graham Freestone confirms this. > Materials do suffer radiation damage, generally causing them to swell: (a> figure from the past in my Msc course was 'Mega Rads', If so then perhaps the idea of using precision plastic nuts in an MLC environment is a problem waiting to happen. Refer to the list entry from David Fenn on 9 May. > The nuts were found to be made from a plastic material, > (which raised a few eyebrows for what is supposed to be a "precision" > component pair!). Each had one stiff spot along it's length and when the > screw diameter was measured with a micrometer, the diameter was > greater by 2-4thou at the stiff spot. Presumably this worked when new. So what had changed????? Personally, I have never even seen a millenium MLC. So this line of thought might not be worth the paper that it's not written on. It might be worthwhile for millenium MLC sites to chase Varian on this one. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Plastic nuts for Varian MLC (millenium) Message-ID: <000001c0d943$60b3b480$bccd07c4@godbox> From: "Jan B. Korrubel" Reply-To: "Jan B. Korrubel" To: Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Plastic nuts for Varian MLC (millenium) Date: Thu, 10 May 2001 00:07:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Nylon does absorb water up to 12%. Hence the problem with the carriage in your water tank. The manufacturer of the tank warns you not to leave the tank overnight with water. Jan Korrubel Cape Town ----- Original Message ----- From: "Dave Pinchin" To: Sent: Wednesday, May 09, 2001 11:13 PM Subject: RE: Plastic nuts for Varian MLC (millenium) > G'day > An interesting thought....... I noted an interesting thing on a RFA7 water tank. After a good while the plastic carriage got tight. I had to bore the holes out to make it run again. > > Question:- Can radiation damage change the shape of some plastics ???? > > If so is it possible that the tightness of the MLC nuts may be a radiation damage effect??????? > > Dave. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Plastic distortion Message-ID: <01May10.082529bst.48@firewall1.ccotrust.co.uk> From: Richard Clements To: linac-eng@plato1.aristotle.net Subject: RE: Plastic distortion Date: Thu, 10 May 2001 00:00:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have never heard of radiation damage changing the shape of plastics, but exposure to water certainly can. We have experienced problems with a water tank if it was not completely emptied at the end of the day. Leaving some water in the tank overnight would cause the plastic bottom rail to expand and the detector carriage would then jam. Richard Clements Clatterbridge Centre for Oncology Bebington Wirral Merseyside. CH63 4JY Tel: (+44) 151 334 1155 ext 4168 Fax: (+44) 151 482 7860 > -----Original Message----- > From: Dave Pinchin [SMTP:Dave.Pinchin@cdhb.govt.nz] > Sent: Wednesday, May 09, 2001 10:14 PM > To: linac-eng@plato1.aristotle.net > Subject: RE: Plastic nuts for Varian MLC (millenium) > > G'day > An interesting thought....... I noted an interesting thing on a RFA7 water > tank. After a good while the plastic carriage got tight. I had to bore the > holes out to make it run again. > > Question:- Can radiation damage change the shape of some plastics ???? > > If so is it possible that the tightness of the MLC nuts may be a > radiation damage effect??????? > > Dave. > > >>> Edward Rymes 10/05/01 04:05:10 >>> > David, > I have to ask... Where did you get your MLC's from? All our 52 and > non-millenium 80 leaf MLC's don't have plastic nuts. The leaf screw > jacks and nuts (called vespule nuts) are all metal, the vespule nut > is a brass/bronze colour. The screw jack and nuts should be replaced > as a set according to the school. > As a point of interest the new Millenium MLC's are supposed to > have plastic nuts which act as a shear point to save the screw jacks, > motors and such when leaves collide. Anyone who has had a leaf > collision will see this makes sense. > Just my two cents worth... > > ed > > > On Tue, 8 May 2001 10:27:13 +0100 David Fenn > wrote: > > > Hi to all! > > I know that you are all discussing more recent MLC units than we have > here > > (we have the old 52 leaf versions), but it is quite possible that the > > principals are the same! > > We suffered from exactly the same problems of high motor current on > certain > > leaves mainly near the extreme ends of travel, but not always. A > temporary > > cure was a small amount of "Superlube", but this eventually led to the > > replacement of the motor and then the lead screw and nut. > > Having removed two stiff lead screw assemblies, these were cleaned and > > examined in detail. The nuts were found to be made from a plastic > material, > > (which raised a few eyebrows for what is supposed to be a "precision" > > component pair!). Each had one stiff spot along it's length and when the > > screw diameter was measured with a micrometer, the diameter was greater > by > > 2-4thou at the stiff spot. This was removed carefully with some fine > emery > > paper and, hey presto, a fully working lead screw and nut assembly. > > It may be worth you guys that have changed lead screw assemblies to get > out > > your micrometers! > > By the way, we now feel that there is an advantage in running these lead > > screws dry, especially when you are sure they run freely over their > entire > > length. Also most lubricants harden with radiation as we all know! I'll > keep > > you posted. > > > > David Fenn > > Kent Oncology Centre > > MAIDSTONE > > UK > > > > -----Original Message----- > > From: owner-linac-eng@plato1.aristotle.net > > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of > > kimyeung@ultraline > > Sent: 04 May 2001 14:47 > > To: ''Linac-Eng@plato1.aristotle.net' ' > > Subject: Re: Varian MLC motor current > > > > > > Hi Colleagues, > > > > Recently there are warm discussions about current of the MLC motor > > which is required to be replaced. The current varies from 20~90mA. > > > > We all agree a high current motor will cause MLC interlock, but I do > > not understand why the discrepancy is so large. I assume we measure the > > MLC motor with the test panel or the service box. > > > > I often replace the MLC motor with a current around 30mA .Do I mix up > > with something? > > > > Any advice? > > > > Thanks in advance. > > > > Kim Yeung > > > > > > ---------------------- > Ed Rymes > Technical Equipment Officer > Dept. of Medical Physics > Tom Baker Cancer Centre > 1331 - 29 Street, N.W. > Calgary,AB, T2N 4N2 > 403-670-1791, fax 670-2327 > edwardry@cancerboard.ab.ca > > > > > ** This email and attachments have been scanned for content and viruses > and is believed to be clean ** > > This email or attachments may contain confidential or legally > privileged information intended for the sole use of the addressee(s). > Any use, redistribution, disclosure, or reproduction of this message, > except as intended, is prohibited. If you received this email in error, > please notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed in this > email (unless otherwise stated) may not represent those of Canterbury > District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Plastic nuts for Varian MLC (millenium) Message-ID: From: graham freestone To: Dave.Pinchin@cdhb.govt.nz, linac-eng@plato1.aristotle.net Subject: RE: Plastic nuts for Varian MLC (millenium) Date: Wed, 9 May 2001 23:31:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Dave et al, Materials do suffer radiation damage, generally causing them to swell: (a figure from the past in my Msc course was 'Mega Rads', this would obviously depend on the material). You might be able to do a Lit search, or ask someone involved in the Nuclear Power industry (who regularly deal with swelling fuel rods in intense & prolonged radiation fields). BTW: I once used a 'loaner' (i.e. battered) Welhofer tank with a plastic horizontal bar i.e. the bit that holds the chamber mount travels along: It was warped by a good couple of mm up in the middle with respect to the ends (not sure what the cause was). Hope this helps Graham Freestone _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Plastic nuts for Varian MLC (millenium) Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: RE: Plastic nuts for Varian MLC (millenium) Date: Wed, 9 May 2001 13:13:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day An interesting thought....... I noted an interesting thing on a RFA7 water tank. After a good while the plastic carriage got tight. I had to bore the holes out to make it run again. Question:- Can radiation damage change the shape of some plastics ???? If so is it possible that the tightness of the MLC nuts may be a radiation damage effect??????? Dave. >>> Edward Rymes 10/05/01 04:05:10 >>> David, I have to ask... Where did you get your MLC's from? All our 52 and non-millenium 80 leaf MLC's don't have plastic nuts. The leaf screw jacks and nuts (called vespule nuts) are all metal, the vespule nut is a brass/bronze colour. The screw jack and nuts should be replaced as a set according to the school. As a point of interest the new Millenium MLC's are supposed to have plastic nuts which act as a shear point to save the screw jacks, motors and such when leaves collide. Anyone who has had a leaf collision will see this makes sense. Just my two cents worth... ed On Tue, 8 May 2001 10:27:13 +0100 David Fenn wrote: > Hi to all! > I know that you are all discussing more recent MLC units than we have here > (we have the old 52 leaf versions), but it is quite possible that the > principals are the same! > We suffered from exactly the same problems of high motor current on certain > leaves mainly near the extreme ends of travel, but not always. A temporary > cure was a small amount of "Superlube", but this eventually led to the > replacement of the motor and then the lead screw and nut. > Having removed two stiff lead screw assemblies, these were cleaned and > examined in detail. The nuts were found to be made from a plastic material, > (which raised a few eyebrows for what is supposed to be a "precision" > component pair!). Each had one stiff spot along it's length and when the > screw diameter was measured with a micrometer, the diameter was greater by > 2-4thou at the stiff spot. This was removed carefully with some fine emery > paper and, hey presto, a fully working lead screw and nut assembly. > It may be worth you guys that have changed lead screw assemblies to get out > your micrometers! > By the way, we now feel that there is an advantage in running these lead > screws dry, especially when you are sure they run freely over their entire > length. Also most lubricants harden with radiation as we all know! I'll keep > you posted. > > David Fenn > Kent Oncology Centre > MAIDSTONE > UK > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of > kimyeung@ultraline > Sent: 04 May 2001 14:47 > To: ''Linac-Eng@plato1.aristotle.net' ' > Subject: Re: Varian MLC motor current > > > Hi Colleagues, > > Recently there are warm discussions about current of the MLC motor > which is required to be replaced. The current varies from 20~90mA. > > We all agree a high current motor will cause MLC interlock, but I do > not understand why the discrepancy is so large. I assume we measure the > MLC motor with the test panel or the service box. > > I often replace the MLC motor with a current around 30mA .Do I mix up > with something? > > Any advice? > > Thanks in advance. > > Kim Yeung > > ---------------------- Ed Rymes Technical Equipment Officer Dept. of Medical Physics Tom Baker Cancer Centre 1331 - 29 Street, N.W. Calgary,AB, T2N 4N2 403-670-1791, fax 670-2327 edwardry@cancerboard.ab.ca ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC motor current Message-ID: <86256A47.005E60E9.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: edwardry@CancerBoard.ab.ca Cc: David Fenn , "'kimyeung@ultraline'" , Linac-Eng@plato1.aristotle.net Subject: RE: Varian MLC motor current Date: Wed, 9 May 2001 09:09:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ed, you have it right. The key phrase there is "non-Millenium". Until recently, the number of leaves pretty told you which generation of MLC was being discussed. But currently if you buy a 52 or 80 leaf MLC, it will be a Millenium, so we ought to get in the habit of referring to our MLCs as Millenium or non-Millenium, since now a "52 leaf" unit could be either, with all their profound differences. Tim Waldron ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC motor current Message-ID: From: Edward Rymes Reply-To: edwardry@CancerBoard.ab.ca To: David Fenn Cc: "'kimyeung@ultraline'" , Linac-Eng@plato1.aristotle.net Subject: RE: Varian MLC motor current Date: Wed, 9 May 2001 08:05:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" David, I have to ask... Where did you get your MLC's from? All our 52 and non-millenium 80 leaf MLC's don't have plastic nuts. The leaf screw jacks and nuts (called vespule nuts) are all metal, the vespule nut is a brass/bronze colour. The screw jack and nuts should be replaced as a set according to the school. As a point of interest the new Millenium MLC's are supposed to have plastic nuts which act as a shear point to save the screw jacks, motors and such when leaves collide. Anyone who has had a leaf collision will see this makes sense. Just my two cents worth... ed On Tue, 8 May 2001 10:27:13 +0100 David Fenn wrote: > Hi to all! > I know that you are all discussing more recent MLC units than we have here > (we have the old 52 leaf versions), but it is quite possible that the > principals are the same! > We suffered from exactly the same problems of high motor current on certain > leaves mainly near the extreme ends of travel, but not always. A temporary > cure was a small amount of "Superlube", but this eventually led to the > replacement of the motor and then the lead screw and nut. > Having removed two stiff lead screw assemblies, these were cleaned and > examined in detail. The nuts were found to be made from a plastic material, > (which raised a few eyebrows for what is supposed to be a "precision" > component pair!). Each had one stiff spot along it's length and when the > screw diameter was measured with a micrometer, the diameter was greater by > 2-4thou at the stiff spot. This was removed carefully with some fine emery > paper and, hey presto, a fully working lead screw and nut assembly. > It may be worth you guys that have changed lead screw assemblies to get out > your micrometers! > By the way, we now feel that there is an advantage in running these lead > screws dry, especially when you are sure they run freely over their entire > length. Also most lubricants harden with radiation as we all know! I'll keep > you posted. > > David Fenn > Kent Oncology Centre > MAIDSTONE > UK > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of > kimyeung@ultraline > Sent: 04 May 2001 14:47 > To: ''Linac-Eng@plato1.aristotle.net' ' > Subject: Re: Varian MLC motor current > > > Hi Colleagues, > > Recently there are warm discussions about current of the MLC motor > which is required to be replaced. The current varies from 20~90mA. > > We all agree a high current motor will cause MLC interlock, but I do > not understand why the discrepancy is so large. I assume we measure the > MLC motor with the test panel or the service box. > > I often replace the MLC motor with a current around 30mA .Do I mix up > with something? > > Any advice? > > Thanks in advance. > > Kim Yeung > > ---------------------- Ed Rymes Technical Equipment Officer Dept. of Medical Physics Tom Baker Cancer Centre 1331 - 29 Street, N.W. Calgary,AB, T2N 4N2 403-670-1791, fax 670-2327 edwardry@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian HE Water Syatems Message-ID: From: Edward Rymes Reply-To: edwardry@CancerBoard.ab.ca To: linac-eng@plato1.aristotle.net Subject: Varian HE Water Syatems Date: Wed, 9 May 2001 07:33:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ref: Varian Customer Technical Bulletin CTB-WA-164A "Clinac HE Inhibited Water System" Good day, Has anyone out there removed their deionizers and used this new method yet? Any problems? The CTB talks about the additives being corrosive... any hazardous material data sheets(MSDS) come with this stuff? And the BIG question: Has anyone had this done by Varian on clinacs still under warranty? ---------------------- Ed Rymes Technical Equipment Officer Dept. of Medical Physics Tom Baker Cancer Centre 1331 - 29 Street, N.W. Calgary,AB, T2N 4N2 403-670-1791, fax 670-2327 edwardry@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Portal Vision IAS2 Message-ID: <85256A47.0051882C.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian Portal Vision IAS2 Date: Wed, 9 May 2001 06:50:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I haven't hooked up to that, but I have used the Portal Vision computer running the Telnet app to look at some of the tests like the Trigger Board Test and such. I think that the serial port would let you do the same things. Randy McVittie London Regional Cancer Centre London, Ontario CANADA 519-685-8600 ext 53151 randy.mcvittie@lrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Portal Vision IAS2 Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Varian Portal Vision IAS2 Date: Wed, 9 May 2001 06:17:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks: I've been having some communication problems with our IAS2's on our HE and LE machines. Yesterday, I tried hooking up my laptop to the serial port on the IAS2. No communication?! Has anyone had any luck doing this? Can it use a regular serial cable, or does it need a null modem cable? Any ideas? Thanks in advance, Carl Murphy, C.E.T. Linear Accelerator Service Technologist Medical Physics Department Nova Scotia Cancer Centre QEII Health Sciences Centre Halifax, Nova Scotia, Canada Email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC home position Message-ID: <3AF9438F.4618042E@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: RE: Varian MLC home position Date: Wed, 9 May 2001 05:18:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We have two Mk4 (80 leaf) and one Mk2 (52 leaf) MLCs. One of the Mk4 has different planned home position for A & B leaves, i.e. 10747 for all A leaves and 10832 for all B leaves. The planned home positions of the other two are the same i.e. 10747. Could anyone advise how does the home position be determined? What are the consequences of having discrepancy in home position? We have tested the MLC motor encoder and find it has 16 pulses per revolution, but the manual indicates it is a 64 pulse encoder with a resolution of 1 mm per 597 counts, which implies all our leaves stop at 1.8 mm, not 2 mm as stated in the manual, away from the optical beam after initialization. Any idea......???? Thanks in advance Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC motor current Message-ID: <8841ce8f6c782e550c80566d37edf6063af7c567@mkoc.demon.co.uk> From: David Fenn To: "'kimyeung@ultraline'" , Linac-Eng@plato1.aristotle.net Subject: RE: Varian MLC motor current Date: Tue, 8 May 2001 01:27:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi to all! I know that you are all discussing more recent MLC units than we have here (we have the old 52 leaf versions), but it is quite possible that the principals are the same! We suffered from exactly the same problems of high motor current on certain leaves mainly near the extreme ends of travel, but not always. A temporary cure was a small amount of "Superlube", but this eventually led to the replacement of the motor and then the lead screw and nut. Having removed two stiff lead screw assemblies, these were cleaned and examined in detail. The nuts were found to be made from a plastic material, (which raised a few eyebrows for what is supposed to be a "precision" component pair!). Each had one stiff spot along it's length and when the screw diameter was measured with a micrometer, the diameter was greater by 2-4thou at the stiff spot. This was removed carefully with some fine emery paper and, hey presto, a fully working lead screw and nut assembly. It may be worth you guys that have changed lead screw assemblies to get out your micrometers! By the way, we now feel that there is an advantage in running these lead screws dry, especially when you are sure they run freely over their entire length. Also most lubricants harden with radiation as we all know! I'll keep you posted. David Fenn Kent Oncology Centre MAIDSTONE UK -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of kimyeung@ultraline Sent: 04 May 2001 14:47 To: ''Linac-Eng@plato1.aristotle.net' ' Subject: Re: Varian MLC motor current Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian MLC motor repairs / rebuilds Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Varian MLC motor repairs / rebuilds Date: Mon, 7 May 2001 13:38:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day all, There has been some discussion on the feasibility of repairing / rebuilding these units. One member said he was having good sucess. Having tried myself without any improvement in mV could someone enlighten me on the method and where to oil with what. While dismantling 2 of these things I noticed :- 1/ the motor leads had scrub marks where the magnet wheel runs. 2/ there is a lot of greese on the coms. From my slot car days that wasn't a good sign. Any comments.......... :D ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC leaf/carraige braking Message-ID: <3AF6E45B.708B6F64@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian MLC leaf/carraige braking Date: Mon, 7 May 2001 10:07:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, I was told the MLC leaves and carriages are under close loop control all the time (unless the MLC controller is switched off.) When I read the leaf's PWM values , they seem unchanged for a given field pattern. When will the leaf and carriage brakes be applied? Could anyone advise the above issues? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC 80 leaf motor Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF995@phsexch6.partners.org> From: "Maddox, Buford J" To: "'kimyeung@ultraline'" , "''Linac-Eng@plato1.aristotle.net' '" Subject: RE: Varian MLC 80 leaf motor Date: Mon, 7 May 2001 09:56:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would suspect worn out brushes inside, making poor contact. > -----Original Message----- > From: kimyeung@ultraline [SMTP:kimyeung@netvigator.com] > Sent: Saturday, May 05, 2001 9:00 AM > To: ''Linac-Eng@plato1.aristotle.net' ' > Subject: Re: Varian MLC 80 leaf motor > > Hi Colleagues, > > We have several incidents of low current MLC motor moving slowly, and > the motor currents measured with the service box were around 6mA. When > the motors were replaced, the leaf movement resumed normal. > > Could anyone give advice/comment on the "slow" motors with low current? > > Thanks in advance. > > Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: <3AF6C17B.E7491307@yale.edu> From: "Peter E. Vitali" To: twaldron@mail.mdanderson.org Cc: aengstle@gundluth.org, Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current Date: Mon, 7 May 2001 07:39:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim: We are planning to start doing IMRT on our 120 Leaf Millennium MLC. Are you doing IMRT on the Millennium 120? How may motors have you lost to doing IMRT? Are there any other facilities doing IMRT on the Millennium 120? How many motors have you lost to IMRT and how long have you been doing IMRT on that Multileaf? What treatment planning system are you using? Thanks to all Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: <86256A45.004EF467.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: aengstle@gundluth.org Cc: Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current Date: Mon, 7 May 2001 06:20:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Alan, this is most certainly true. Our first Varian MLC was installed here in 1990 (52 leaf Mark 0, later upgraded to Mark 2). Our second came in 1992, also a 52 leaf Mk 2. In 1998, we received our third and fourth, both 80 leaf Mk 4s. ***In the period 1990 to to 1999, I think we changed less than 10 motors total. -With 264 leaves in operation.*** ***In 1999, we started performing IMRT using DMLC and Corvus (the planning system makes a big difference in leaf patterning) on #4 and #5. We have since replaced approximately 80 motors, mostly on the two doing IMRT.*** The hypothesis seems to be that the Corvus algorithm plans leaves driving while touching, which causes transmission damage. On the Millenium series MLCs, this has been addressed via a patch to the MLC control software to disallow 0 leaf separation (those of you had Mk 0 and Mk 1 MLCs might remember this is how they were back in the beginning!), resulting in many fewer motor failures on our 120. Said patch is not available for the non-Millenium series MLCs, unfortunately. NOMOS is working on a patch to their planning system to compensate, but there is no saying when it might be available. I am told that this is not an issue for Helios-planned IMRT, but I have no firsthand experience with that. So if you have Varian non-Millenium MLCs, and are going to do IMRT with Corvus, stock up on motors, and be prepared to spend a bit more time doing MLC work. Tim Waldron aengstle@gundluth.org on 05/07/2001 08:23:58 AM To: "Dave Pinchin" , linac-eng@plato1.aristotle.net cc: (bcc: Timothy J. Waldron/MDACC) Subject: Re: Varian MLC motor current We use about 1 motor every 6 months. We are not currently doing IMRT, this may get worse with more fields. Alan Engstler "Dave Pinchin" > cc: Sent by: Subject: Re: Varian MLC motor current owner-linac-eng@plato1.ari stotle.net 05/06/01 05:07 PM G'day, Our experience (Varian 80 leaf) is that the first indication of problems is the failure to initialise with a leaf timeout. If we cannot get an initialise to happen we check the motors. Typically the motor is running at ~15mV mounted or unmounted. (Using test panel). We replace the motor and remeasure ~3mV We must have used ~6 motors in the last 30 months. Any comments ??????? Dave >>> "kimyeung@ultraline" 5/05/01 01:47:24 >>> Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: From: aengstle@gundluth.org To: Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current Date: Mon, 7 May 2001 05:23:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We use about 1 motor every 6 months. We are not currently doing IMRT, this may get worse with more fields. Alan Engstler "Dave Pinchin" > cc: Sent by: Subject: Re: Varian MLC motor current owner-linac-eng@plato1.ari stotle.net 05/06/01 05:07 PM G'day, Our experience (Varian 80 leaf) is that the first indication of problems is the failure to initialise with a leaf timeout. If we cannot get an initialise to happen we check the motors. Typically the motor is running at ~15mV mounted or unmounted. (Using test panel). We replace the motor and remeasure ~3mV We must have used ~6 motors in the last 30 months. Any comments ??????? Dave >>> "kimyeung@ultraline" 5/05/01 01:47:24 >>> Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC motor current Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: John.Ukos@hrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian MLC motor current Date: Sun, 6 May 2001 23:15:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Ukos, John [SMTP:John.Ukos@hrcc.on.ca] Sent: Friday, May 04, 2001 7:46 PM To: 'Wilson, Jim'; Linac Bulletin Board Posting (E-mail) Subject: RE: Varian MLC motor current Your right Jim, motors should last longer than the MLC ones do. Our 80 leaf mark 4 has had near 20 motor changes(guessing) since it was installed in 98. Hi Jim, John & others 20 motors in 3 years? I am astonished! In our place we have 2 MLC's since nov.'96 (first 56 leafs, updated a year ago to 80 leafs) and we only had to replace a few motors. (although we had problems with leaf screw/nuts) Motors are running typically at 2,5-5 mV shuntvoltage (gantry down) and we keep them that way by regular cleaning the leafs and a very tiny 'squidge' of superlube at the screws. When motorcurrents are rising we first replace the leaf screw/nuts and that cures the problem in 90% of the cases. Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Cc: kimyeung@netvigator.com Subject: Re: Varian MLC motor current Date: Sun, 6 May 2001 14:07:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Our experience (Varian 80 leaf) is that the first indication of problems is the failure to initialise with a leaf timeout. If we cannot get an initialise to happen we check the motors. Typically the motor is running at ~15mV mounted or unmounted. (Using test panel). We replace the motor and remeasure ~3mV We must have used ~6 motors in the last 30 months. Any comments ??????? Dave >>> "kimyeung@ultraline" 5/05/01 01:47:24 >>> Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: FW: Varian MLC motor current Message-ID: From: Dave Pinchin To: "Wilson, Jim" Subject: Re: FW: Varian MLC motor current Date: Sun, 6 May 2001 13:34:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, We have only one Varian MLC with 80 leaves. We have found the motor replacement rate satisfactory. I have dismantled a motor and found it extremely well made but not repairable. We would spend about 3 - 5 hours per month on the unit but we are not severely understaffed. Hope this helps. Dave. >>> "Wilson, Jim" 5/05/01 04:53:06 >>> -----Original Message----- From: Wilson, Jim Sent: Friday, May 04, 2001 9:52 AM To: 'aengstle@gundluth.org' Subject: RE: Varian MLC motor current We will be aquiring a total of 5 MLC's (Varian) in the next year in our facilities. We currently have none. This thread and others concerning MLC maintenance is a bit disconcerting, considering that we are significantly understaffed for our current workload. It sounds to me like the drive motors are wearing out. I have not seen that happen much in my 33 year career. Do you gentlemen have the impression that the motors are undersized for the application?? Sure brushes and bearings and armatures etc do have a limited life span, but I have had motors running under heavy loads or intermittant high current situations that have worked for many years without fail. What do you think? -----Original Message----- From: aengstle@gundluth.org [mailto:aengstle@gundluth.org] Sent: Friday, May 04, 2001 8:38 AM To: Linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current ----- Forwarded by Al Engstler/IS/LAX/GUNDLUTH on 05/04/01 10:39 AM ----- Al Engstler To: "kimyeung@ultraline" 05/04/01 10:09 cc: AM Subject: Re: Varian MLC motor current(Document link: Al Engstler) I have replaced motors when the Therapists tell me a leaf is moving slow. Slow moving leafs start causing a timeout error with our IMPAC. You can watch the screen and see one leaf consistantly being late completeing a move. When I measure the motor current at the test points at the service box they are usually around 20mv. New ones and others on this side will normally run from 3 to 7mv. I have done some cleaning/lube and gotten ones that run 7mv down to 3. This is of course measured with my DVM which at this low voltage may not be the most accurate. Also,I should say this a Varian 80 leaf MLC mark 4. Alan Engstler Gundersen Lutheran "kimyeung@ultraline" owner-linac-eng@plato1.ari cc: stotle.net Subject: Re: Varian MLC motor current 05/04/01 08:47 AM Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung **************************************************************************** This message is intended for the sole use of the individual and entity to whom it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended addressee, nor authorized to receive for the intended addressee, you are hereby notified that you may not use, copy, disclose or distribute to anyone the message or any information contained in the message. If you have received this message in error, please immediately advise the sender by reply email and delete the message. Thank you very much. * * This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC 80 leaf motor Message-ID: <3AF3F94E.AE22213A@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian MLC 80 leaf motor Date: Sat, 5 May 2001 04:59:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We have several incidents of low current MLC motor moving slowly, and the motor currents measured with the service box were around 6mA. When the motors were replaced, the leaf movement resumed normal. Could anyone give advice/comment on the "slow" motors with low current? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: FW: Varian MLC motor current Message-ID: <3AF3F9A2.AC9BD582@netvigator.com> From: "kimyeung@ultraline" To: "Wilson, Jim" Subject: Re: FW: Varian MLC motor current Date: Sat, 5 May 2001 05:01:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, Thanks ! Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: FW: Varian MLC motor current Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "Wilson, Jim" Subject: Re: FW: Varian MLC motor current Date: Fri, 4 May 2001 16:37:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, The new mlc is far superior to the old......many who are writing to this forum appear to be of questionable experience. Many are referring to the old style or even maybe early serial number mill. mlcs. I would not be negative about the purchases, assuming that you will be trained. Be sure the desired wedge size is specified, i.e 15, 20 or 30 cm and that the digitizer room is properly designed, i.e the light box, network considerations. Also be very clear about the record and verify system, its abilities to interface with gen 6 software, the mlc, portal vision, can it transfer images via the network, can you print films if desired. Portal vision upgrade to the new detector matrix should be considered. Speaking with Susan Nemeth at Medford's Providence is highly suggested, if you do, tell her hello from me. Regards, Dave Hall Regards, Dave Hall -- On Fri, 4 May 2001 09:53:06 Wilson, Jim wrote: > > >-----Original Message----- >From: Wilson, Jim >Sent: Friday, May 04, 2001 9:52 AM >To: 'aengstle@gundluth.org' >Subject: RE: Varian MLC motor current > > >We will be aquiring a total of 5 MLC's (Varian) in the next year in our >facilities. We currently have none. This thread and others concerning MLC >maintenance is a bit disconcerting, considering that we are significantly >understaffed for our current workload. It sounds to me like the drive motors >are wearing out. I have not seen that happen much in my 33 year career. Do >you gentlemen have the impression that the motors are undersized for the >application?? Sure brushes and bearings and armatures etc do have a limited >life span, but I have had motors running under heavy loads or intermittant >high current situations that have worked for many years without fail. What >do you think? > >-----Original Message----- >From: aengstle@gundluth.org [mailto:aengstle@gundluth.org] >Sent: Friday, May 04, 2001 8:38 AM >To: Linac-eng@plato1.aristotle.net >Subject: Re: Varian MLC motor current > > > >----- Forwarded by Al Engstler/IS/LAX/GUNDLUTH on 05/04/01 10:39 AM ----- > > > Al Engstler > > To: "kimyeung@ultraline" > > 05/04/01 10:09 cc: > > AM Subject: Re: Varian MLC motor >current(Document link: Al Engstler) > > > > > > > >I have replaced motors when the Therapists tell me a leaf is moving slow. >Slow moving leafs start causing a timeout error with our IMPAC. You can >watch the screen and see one leaf consistantly being late completeing a >move. When I measure the motor current at the test points at the service >box they are usually around 20mv. New ones and others on this side will >normally run from 3 to 7mv. I have done some cleaning/lube and gotten ones >that run 7mv down to 3. This is of course measured with my DVM which at >this low voltage may not be the most accurate. Also,I should say this a >Varian 80 leaf MLC mark 4. >Alan Engstler >Gundersen Lutheran > > > > > "kimyeung@ultraline" > > "''Linac-Eng@plato1.aristotle.net' '" > Sent by: > > owner-linac-eng@plato1.ari cc: > > stotle.net Subject: Re: >Varian MLC motor current > > > > > 05/04/01 08:47 AM > > > > > > > > > >Hi Colleagues, > >Recently there are warm discussions about current of the MLC motor >which is required to be replaced. The current varies from 20~90mA. > >We all agree a high current motor will cause MLC interlock, but I do >not understand why the discrepancy is so large. I assume we measure the >MLC motor with the test panel or the service box. > >I often replace the MLC motor with a current around 30mA .Do I mix up >with something? > >Any advice? > >Thanks in advance. > >Kim Yeung > > > > > > >*************************************************************************** * >This message is intended for the sole use of the individual and entity to >whom it is addressed, and may contain information that is privileged, >confidential and exempt from disclosure under applicable law. If you are >not the intended addressee, nor authorized to receive for the intended >addressee, you are hereby notified that you may not use, copy, disclose or >distribute to anyone the message or any information contained in the >message. If you have received this message in error, please immediately >advise the sender by reply email and delete the message. Thank you very >much. > Get 250 color business cards for FREE! http://businesscards.lycos.com/vp/fastpath/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Keyboard Message-ID: From: shane woodall To: "Watters, Dan" , linac-eng@plato1.aristotle.net Subject: Re: Siemens Keyboard Date: Fri, 4 May 2001 13:29:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dan Had the same problem once. try re-soldering the connector to the board because lifting the keyboard up puts strain on the connector causing the solder to break. ----- Original Message ----- From: "Watters, Dan" To: Sent: Thursday, May 03, 2001 11:30 PM Subject: Siemens Keyboard > Hi Again, > > A little further investigation on the keyboard tone problem revealed either > a bad trace or connection on the pcb where the linac connector goes in. > Pressing down on the connector caused the tone to stop. Of course this > flexes the PCB so the culprit could be in a few areas. Appears this > connector has been flexed a few too many times. Will have to disassemble > the keyboard a little further and break out the magnifying glass. > Interesting some of the problems these linac things can come up with. > > Thanks, > > Dan Watters > UMC Tucson > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC motor current Message-ID: <9C688FB52A05D51194750002B325B5F7340EED@hrccex.hrcc.on.ca> From: "Ukos, John" To: "Wilson, Jim" , "Linac Bulletin Board Posting (E-mail)" Subject: RE: Varian MLC motor current Date: Fri, 4 May 2001 09:45:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Your right Jim, motors should last longer than the MLC ones do. Our 80 leaf mark 4 has had near 20 motor changes(guessing) since it was installed in 98. We have long operating days and high through put (prostates mostly on this machine)but a couple of years for a motor on the outside of the bank is a "good run". Granted these aren't your typical size motor, but if they aren't considered underrated then they are an expensive "consumable". -----Original Message----- From: Wilson, Jim [mailto:JWilson3@providence.org] Sent: Friday, May 04, 2001 12:53 PM To: Linac Bulletin Board Posting (E-mail) Subject: FW: Varian MLC motor current -----Original Message----- From: Wilson, Jim Sent: Friday, May 04, 2001 9:52 AM To: 'aengstle@gundluth.org' Subject: RE: Varian MLC motor current We will be aquiring a total of 5 MLC's (Varian) in the next year in our facilities. We currently have none. This thread and others concerning MLC maintenance is a bit disconcerting, considering that we are significantly understaffed for our current workload. It sounds to me like the drive motors are wearing out. I have not seen that happen much in my 33 year career. Do you gentlemen have the impression that the motors are undersized for the application?? Sure brushes and bearings and armatures etc do have a limited life span, but I have had motors running under heavy loads or intermittant high current situations that have worked for many years without fail. What do you think? -----Original Message----- From: aengstle@gundluth.org [mailto:aengstle@gundluth.org] Sent: Friday, May 04, 2001 8:38 AM To: Linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current ----- Forwarded by Al Engstler/IS/LAX/GUNDLUTH on 05/04/01 10:39 AM ----- Al Engstler To: "kimyeung@ultraline" 05/04/01 10:09 cc: AM Subject: Re: Varian MLC motor current(Document link: Al Engstler) I have replaced motors when the Therapists tell me a leaf is moving slow. Slow moving leafs start causing a timeout error with our IMPAC. You can watch the screen and see one leaf consistantly being late completeing a move. When I measure the motor current at the test points at the service box they are usually around 20mv. New ones and others on this side will normally run from 3 to 7mv. I have done some cleaning/lube and gotten ones that run 7mv down to 3. This is of course measured with my DVM which at this low voltage may not be the most accurate. Also,I should say this a Varian 80 leaf MLC mark 4. Alan Engstler Gundersen Lutheran "kimyeung@ultraline" owner-linac-eng@plato1.ari cc: stotle.net Subject: Re: Varian MLC motor current 05/04/01 08:47 AM Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung **************************************************************************** This message is intended for the sole use of the individual and entity to whom it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended addressee, nor authorized to receive for the intended addressee, you are hereby notified that you may not use, copy, disclose or distribute to anyone the message or any information contained in the message. If you have received this message in error, please immediately advise the sender by reply email and delete the message. Thank you very much. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: FW: Varian MLC motor current Message-ID: From: "Wilson, Jim" To: "Linac Bulletin Board Posting (E-mail)" Subject: FW: Varian MLC motor current Date: Fri, 4 May 2001 08:53:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----Original Message----- From: Wilson, Jim Sent: Friday, May 04, 2001 9:52 AM To: 'aengstle@gundluth.org' Subject: RE: Varian MLC motor current We will be aquiring a total of 5 MLC's (Varian) in the next year in our facilities. We currently have none. This thread and others concerning MLC maintenance is a bit disconcerting, considering that we are significantly understaffed for our current workload. It sounds to me like the drive motors are wearing out. I have not seen that happen much in my 33 year career. Do you gentlemen have the impression that the motors are undersized for the application?? Sure brushes and bearings and armatures etc do have a limited life span, but I have had motors running under heavy loads or intermittant high current situations that have worked for many years without fail. What do you think? -----Original Message----- From: aengstle@gundluth.org [mailto:aengstle@gundluth.org] Sent: Friday, May 04, 2001 8:38 AM To: Linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current ----- Forwarded by Al Engstler/IS/LAX/GUNDLUTH on 05/04/01 10:39 AM ----- Al Engstler To: "kimyeung@ultraline" 05/04/01 10:09 cc: AM Subject: Re: Varian MLC motor current(Document link: Al Engstler) I have replaced motors when the Therapists tell me a leaf is moving slow. Slow moving leafs start causing a timeout error with our IMPAC. You can watch the screen and see one leaf consistantly being late completeing a move. When I measure the motor current at the test points at the service box they are usually around 20mv. New ones and others on this side will normally run from 3 to 7mv. I have done some cleaning/lube and gotten ones that run 7mv down to 3. This is of course measured with my DVM which at this low voltage may not be the most accurate. Also,I should say this a Varian 80 leaf MLC mark 4. Alan Engstler Gundersen Lutheran "kimyeung@ultraline" owner-linac-eng@plato1.ari cc: stotle.net Subject: Re: Varian MLC motor current 05/04/01 08:47 AM Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung **************************************************************************** This message is intended for the sole use of the individual and entity to whom it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended addressee, nor authorized to receive for the intended addressee, you are hereby notified that you may not use, copy, disclose or distribute to anyone the message or any information contained in the message. If you have received this message in error, please immediately advise the sender by reply email and delete the message. Thank you very much. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: From: aengstle@gundluth.org To: Linac-eng@plato1.aristotle.net Subject: Re: Varian MLC motor current Date: Fri, 4 May 2001 07:37:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----- Forwarded by Al Engstler/IS/LAX/GUNDLUTH on 05/04/01 10:39 AM ----- Al Engstler To: "kimyeung@ultraline" 05/04/01 10:09 cc: AM Subject: Re: Varian MLC motor current(Document link: Al Engstler) I have replaced motors when the Therapists tell me a leaf is moving slow. Slow moving leafs start causing a timeout error with our IMPAC. You can watch the screen and see one leaf consistantly being late completeing a move. When I measure the motor current at the test points at the service box they are usually around 20mv. New ones and others on this side will normally run from 3 to 7mv. I have done some cleaning/lube and gotten ones that run 7mv down to 3. This is of course measured with my DVM which at this low voltage may not be the most accurate. Also,I should say this a Varian 80 leaf MLC mark 4. Alan Engstler Gundersen Lutheran "kimyeung@ultraline" owner-linac-eng@plato1.ari cc: stotle.net Subject: Re: Varian MLC motor current 05/04/01 08:47 AM Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC motor current Message-ID: <3AF2B2EB.A51FD2A1@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian MLC motor current Date: Fri, 4 May 2001 05:47:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Recently there are warm discussions about current of the MLC motor which is required to be replaced. The current varies from 20~90mA. We all agree a high current motor will cause MLC interlock, but I do not understand why the discrepancy is so large. I assume we measure the MLC motor with the test panel or the service box. I often replace the MLC motor with a current around 30mA .Do I mix up with something? Any advice? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Keyboard Message-ID: <6CE096D0CDF4D211A3110008C75D075236062B@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Siemens Keyboard Date: Thu, 3 May 2001 19:30:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Again, A little further investigation on the keyboard tone problem revealed either a bad trace or connection on the pcb where the linac connector goes in. Pressing down on the connector caused the tone to stop. Of course this flexes the PCB so the culprit could be in a few areas. Appears this connector has been flexed a few too many times. Will have to disassemble the keyboard a little further and break out the magnifying glass. Interesting some of the problems these linac things can come up with. Thanks, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens MD-2 Keyboard Message-ID: <6CE096D0CDF4D211A3110008C75D075236062A@XChange.umcaz.edu> From: "Watters, Dan" To: "'Linac-eng@plato1.aristotle.net'" Subject: Siemens MD-2 Keyboard Date: Thu, 3 May 2001 18:45:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, Having a problem with the keyboard on our MD-2 serial number 2705. We have a high pitched tone coming out of this keyboard at all times when the machine is turned on. You have to listen closely for it. When the key is turned to rad on it gets a bit louder. Really starting to get irritating. As those of us who work on Siemens machines know there really is nothing in the way schematics on the keyboard. I have unplugged the keys and buttons one at a time with no change. Additionally I checked all connections between the two PCB's and all was OK. I put my finger over the sonolert and the tone does not change so I don't suspect that as the problem. This isn't causing any machine problems but I am getting frustrated because I am not sure what it causing it. Seems as though there must be an oscillator that is possibly off frequency. This system has the latest IMPAC software on it and we are using this keyboard for both the linac and IMPAC. Anyone else had this happen to them? Thanks in advance and hope you all have a great weekend. Thanks, Dan Watters University Med Center Tucson, AZ. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian 80 leaf mlc problems Message-ID: <32BB029387A6D4118C7F00C00D00433114302F@MBPCC_EXCHANGE> From: "Hidalgo, Dr Oscar" To: "'Peter E. Vitali'" , "Lapenna, Russ" Cc: "'edwardry@CancerBoard.ab.ca'" , Dave Pinchin , linac-eng@plato1.aristotle.net, Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz Subject: RE: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 07:56:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Be careful with purer than 95% ethanol, it might be contaminated with something else like benzene. Check the label. -----Original Message----- From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] Sent: Thursday, May 03, 2001 6:54 AM To: Lapenna, Russ Cc: 'edwardry@CancerBoard.ab.ca'; Dave Pinchin; linac-eng@plato1.aristotle.net; Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz Subject: Re: Varian 80 leaf mlc problems Good morning all: At the Millennium MLC School in March of this year 95% alcohol was the solvent we were told to use. It has to be 95% or better. The purer the better. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... "Lapenna, Russ" wrote: > > Good Day also, > > Dave, the " squidge on the runners " is old school... the leaves > > are treated with a coating of Molybdenum Di-Sulfate and just require > > a clean wipedown.This I picked up a couple of years ago at Varian. An > > alcohol bath once in a while will also get rid of grime and crud. > > Not to be a stickler, but apparently (according to Varian) the > Molybdenum Di-Sulfate surface does not take too well to alcohol, ie: wears > it away. Varian course instructors recommend paint thinner, turpentine or > some other sort of de-natured alcohol. > > Russ LaPenna > Electronics Engineering Technologist > Medical Physics Department > Hamilton Regional Cancer Centre > 699 Concession St. > Hamilton, Ontario > Canada > L8V 5C2 > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: <86256A41.0051879A.00@utm-notesob1.mdacc.tmc.edu> From: clfikes@mail.mdanderson.org To: tcullen@wfubmc.edu, linac-eng@plato1.aristotle.net Subject: Re: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 06:43:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" And then there's always the "special lube". You would be surprised how far a little urine can go when the MLC happens to be underneath a patient during an accident. The head cover is not exactly water-tight. However, this type of lube is untested and should be avoided. Chad Fikes clfikes@mdanderson.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: <5.1.0.14.0.20010503095805.01d54720@pop.channel1.com> From: Martin Fraser To: linac-eng@plato1.aristotle.net Subject: Re: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 05:59:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" May I ask if Eds' comment represents the collective experience on motor current/failure wrt gantry position? I find that if initialization fails due to a balky motor (often in the 70-80 range) then it will work OK (pass initialization) at 270 or 90. I presume that leaf friction trumps gravity. The MLC is on my 2100 #1177, circa 1998 and you? thanks Martin Fraser > Back on the original post, 90mv is way too high for a leaf motor >current. If I get over 10mv I clean and over 20mv it's put in a new >motor. Like Dave here give the new motor a spin with no load and then >with a load. If it jumps up signifigantly under load pull the leaf >and see if the screwjack is causing the problem. High motor currents >will cause all sorts of problems especially @90 or 270 degrees on the >gantry where you are fighting gravity. Good luck. > >Ed ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: <3AF15C7C.A113E122@wfubmc.edu> From: tcullen@wfubmc.edu To: linac-eng@plato1.aristotle.net Subject: Re: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 05:26:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You may want to check one of the tribology or MOS2 web sites to find out what would be best to clean the MOS2 coated leaves. My take on this is the MOS2 coating is deposited on the leave and depending on the bonding process it would seem really hard to remove other than burnishing it in some way. I believe even if burnished down to a shine it would still have the MOS2 bonded into the pores of the leaves. I think for clearance and tolerance purposes on coated surfaces they usually do have to burnish or buff of some of the coating. As for cleaning, one would think a dry rag and compressed air would do just as good considering where these are located. I say this based on the fact I've never seen the major amount of gunk on the leaves as I hear about from time to time. Of course you never know when a therapist may prove Murphy's Law works. Tim "Peter E. Vitali" wrote: > Good morning all: > > At the Millennium MLC School in March of this year 95% alcohol was the solvent we were told to use. It has to be 95% or better. The purer the better. > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Yale New Haven Hospital > 20 York Street, HRT 22 > New Haven, CT. 06504 > Phone: (203) 688-2948 > FAX: (203) 688-3663 > E-mail: peter.vitali@yale.edu > > As usual, everything I say may be plausibly denied at my employer's convenience... > > "Lapenna, Russ" wrote: > > > > Good Day also, > > > Dave, the " squidge on the runners " is old school... the leaves > > > are treated with a coating of Molybdenum Di-Sulfate and just require > > > a clean wipedown.This I picked up a couple of years ago at Varian. An > > > alcohol bath once in a while will also get rid of grime and crud. > > > > Not to be a stickler, but apparently (according to Varian) the > > Molybdenum Di-Sulfate surface does not take too well to alcohol, ie: wears > > it away. Varian course instructors recommend paint thinner, turpentine or > > some other sort of de-natured alcohol. > > > > Russ LaPenna > > Electronics Engineering Technologist > > Medical Physics Department > > Hamilton Regional Cancer Centre > > 699 Concession St. > > Hamilton, Ontario > > Canada > > L8V 5C2 > > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: <3AF146D1.D5C7D5EA@yale.edu> From: "Peter E. Vitali" To: "Lapenna, Russ" Cc: "'edwardry@CancerBoard.ab.ca'" , Dave Pinchin , linac-eng@plato1.aristotle.net, Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz Subject: Re: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 03:53:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning all: At the Millennium MLC School in March of this year 95% alcohol was the solvent we were told to use. It has to be 95% or better. The purer the better. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... "Lapenna, Russ" wrote: > > Good Day also, > > Dave, the " squidge on the runners " is old school... the leaves > > are treated with a coating of Molybdenum Di-Sulfate and just require > > a clean wipedown.This I picked up a couple of years ago at Varian. An > > alcohol bath once in a while will also get rid of grime and crud. > > Not to be a stickler, but apparently (according to Varian) the > Molybdenum Di-Sulfate surface does not take too well to alcohol, ie: wears > it away. Varian course instructors recommend paint thinner, turpentine or > some other sort of de-natured alcohol. > > Russ LaPenna > Electronics Engineering Technologist > Medical Physics Department > Hamilton Regional Cancer Centre > 699 Concession St. > Hamilton, Ontario > Canada > L8V 5C2 > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian 80 leaf mlc problems Message-ID: <9C688FB52A05D51194750002B325B5F714F745@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: "'edwardry@CancerBoard.ab.ca'" , Dave Pinchin Cc: linac-eng@plato1.aristotle.net, Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz Subject: RE: Varian 80 leaf mlc problems Date: Thu, 3 May 2001 02:41:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Good Day also, > Dave, the " squidge on the runners " is old school... the leaves > are treated with a coating of Molybdenum Di-Sulfate and just require > a clean wipedown.This I picked up a couple of years ago at Varian. An > alcohol bath once in a while will also get rid of grime and crud. Not to be a stickler, but apparently (according to Varian) the Molybdenum Di-Sulfate surface does not take too well to alcohol, ie: wears it away. Varian course instructors recommend paint thinner, turpentine or some other sort of de-natured alcohol. Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: <001401c0d364$4d818ca0$0100a8c0@mshome.net> From: Richard Kimball To: linac-eng@plato1.aristotle.net Subject: Re: Varian 80 leaf mlc problems Date: Wed, 2 May 2001 16:02:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Some comments below in response. > Good Day also, > Dave, the " squidge on the runners " is old school... the leaves > are treated with a coating of Molybdenum Di-Sulfate and just require > a clean wipedown.This I picked up a couple of years ago at Varian. An > alcohol bath once in a while will also get rid of grime and crud. The > leaf screwjacks and the nut however should be cleaned of all the crud > and lubed with just a smidge(another technical term) of superlube. > Best time to do this is when you have all the leaves out. I take the > whole carriage off and use the couch as a bench. That way you still > can power the motors to remove and install the leaves. It takes a > while but it is worth it. I totally agree with all of the above! > Back on the original post, 90mv is way too high for a leaf motor > current. Too high yes....'way too high'...er....maybe....change if you have the time or mark for replacement next PMI >If I get over 10mv I clean and over 20mv it's put in a new > motor. 70mv (ma) was always the rule I was taught for targeted replacement. Depends if the current is the same on extend as retract on whether I will replace. 10-20mv (ma) is, in my experience, nominal running current. You must change a lot of motors?! This of course applies to Mark series (CR) type Varian MLC's. Since the software is still lacking in the Millennium design, there is no easy way to check motor currents except by the percent duty cycle. You have to connect each motor to a special board for the 'M' series. A task that loses it's luster after the first bank of 60! >Like Dave here give the new motor a spin with no load and then > with a load. If it jumps up signifigantly under load pull the leaf > and see if the screwjack is causing the problem. High motor currents > will cause all sorts of problems especially @90 or 270 degrees on the > gantry where you are fighting gravity. Good luck. Agreement again. > > Ed Rich Kimball Acceletronics Midwest ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: mlc problems Message-ID: <001e01c0d365$f6939a80$0100a8c0@mshome.net> From: Richard Kimball To: "Moore, Lee" , linac-eng@plato1.aristotle.net Subject: Re: mlc problems Date: Wed, 2 May 2001 16:13:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ----- Original Message ----- From: "Moore, Lee" To: Sent: Wednesday, May 02, 2001 10:00 AM Subject: mlc problems > We are currently having intermittent mlc failures with our "B" side stuck > in the middle of the field during or after port films. I have replaced both > mot comm pcb,combo comm pcb in the controller computer as well as all parts > associated with the B side in the head assembly(motor driver, head xceiver, > secondary feedback pcb, motor interconnect pcb, optical emitter, optical > receiver, encoder strip, carriage microswitch). You might also want to swap your fiber cables around or use your spares. >From the sounds of things, you have replaced everything except bearings (which could still be a problem). I would go for a fiber swap next. There could be a faulty connector and it flexes as the carriage moves. Unless of course you have a handy dandy Fluke Fiber Optic Meter and Fiber Optic Source (something I always had as an in-house) and you actually test your transimission/receive db loss. >Also checked all motor > currrents on b side, when I noticed 3 of the leafs were out of tolerence. I > replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. > Motor currents are still in the 90 mv range. Not sure if this is the source > of my intermittant problems or not, but was wondering if anyone has replaced > individual leafs on their systems or had any suggestions. Although I never have had to, I have been told that it is not uncommon to replace individual leaves. They are in stock in Varian supplies. You CAN swap leaves around in the carriage to see if you have a leaf drag problem. If your motor currents go down with a different leaf....order a new one. I am of the firm opinion that all Varian MLC (regardless of type) need a thourough alcohol bath at least every 2 years. (See Ed Rymes post) If your carriage or leaves are dirty, this will cause higher than normal motor currents too. . >Thanks in > advance. > Rich Kimball Acceletronics Midwest ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: From: Edward Rymes Reply-To: edwardry@CancerBoard.ab.ca To: Dave Pinchin Cc: linac-eng@plato1.aristotle.net, Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz Subject: Re: Varian 80 leaf mlc problems Date: Wed, 2 May 2001 14:40:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good Day also, Dave, the " squidge on the runners " is old school... the leaves are treated with a coating of Molybdenum Di-Sulfate and just require a clean wipedown.This I picked up a couple of years ago at Varian. An alcohol bath once in a while will also get rid of grime and crud. The leaf screwjacks and the nut however should be cleaned of all the crud and lubed with just a smidge(another technical term) of superlube. Best time to do this is when you have all the leaves out. I take the whole carriage off and use the couch as a bench. That way you still can power the motors to remove and install the leaves. It takes a while but it is worth it. Back on the original post, 90mv is way too high for a leaf motor current. If I get over 10mv I clean and over 20mv it's put in a new motor. Like Dave here give the new motor a spin with no load and then with a load. If it jumps up signifigantly under load pull the leaf and see if the screwjack is causing the problem. High motor currents will cause all sorts of problems especially @90 or 270 degrees on the gantry where you are fighting gravity. Good luck. Ed On Thu, 03 May 2001 09:01:39 +1200 Dave Pinchin wrote: > G'day, > Never seen anything like it. But whenever we replace a motor we always connect the motor and give it a run before bolting it in. This gives a good indication of what sort of base current (mV) we should be getting. Typically 2-3mV. > > Another thought is ensure the lubrication is as per Varian's latest recomendation. > Last time I did it I think it was "a squidge of superlube on top and bottom runners then wipe as much of it off as you can." > > Good luck. > Dave > > > >>> "Moore, Lee" 3/05/01 03:00:45 >>> > We are currently having intermittent mlc failures with our "B" side stuck > in the middle of the field during or after port films. I have replaced both > mot comm pcb,combo comm pcb in the controller computer as well as all parts > associated with the B side in the head assembly(motor driver, head xceiver, > secondary feedback pcb, motor interconnect pcb, optical emitter, optical > receiver, encoder strip, carriage microswitch). Also checked all motor > currrents on b side, when I noticed 3 of the leafs were out of tolerence. I > replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. > Motor currents are still in the 90 mv range. Not sure if this is the source > of my intermittant problems or not, but was wondering if anyone has replaced > individual leafs on their systems or had any suggestions. Thanks in > advance. > > > > ** This email and attachments have been scanned for content and viruses > and is believed to be clean ** > > This email or attachments may contain confidential or legally > privileged information intended for the sole use of the addressee(s). > Any use, redistribution, disclosure, or reproduction of this message, > except as intended, is prohibited. If you received this email in error, > please notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed in this > email (unless otherwise stated) may not represent those of Canterbury > District Health Board. ---------------------- Ed Rymes Technical Equipment Officer Dept. of Medical Physics Tom Baker Cancer Centre 1331 - 29 Street, N.W. Calgary,AB, T2N 4N2 403-670-1791, fax 670-2327 edwardry@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 80 leaf mlc problems Message-ID: From: Dave Pinchin To: Moore#m##032#Lee#034##060#lmoore@cdhb.govt.nz, linac-eng@plato1.aristotle.net Subject: Re: Varian 80 leaf mlc problems Date: Wed, 2 May 2001 13:01:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Never seen anything like it. But whenever we replace a motor we always connect the motor and give it a run before bolting it in. This gives a good indication of what sort of base current (mV) we should be getting. Typically 2-3mV. Another thought is ensure the lubrication is as per Varian's latest recomendation. Last time I did it I think it was "a squidge of superlube on top and bottom runners then wipe as much of it off as you can." Good luck. Dave >>> "Moore, Lee" 3/05/01 03:00:45 >>> We are currently having intermittent mlc failures with our "B" side stuck in the middle of the field during or after port films. I have replaced both mot comm pcb,combo comm pcb in the controller computer as well as all parts associated with the B side in the head assembly(motor driver, head xceiver, secondary feedback pcb, motor interconnect pcb, optical emitter, optical receiver, encoder strip, carriage microswitch). Also checked all motor currrents on b side, when I noticed 3 of the leafs were out of tolerence. I replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. Motor currents are still in the 90 mv range. Not sure if this is the source of my intermittant problems or not, but was wondering if anyone has replaced individual leafs on their systems or had any suggestions. Thanks in advance. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: P.S. ... once again... templates are really nifty.... Message-ID: <3AF068EA.58917ECD@scf.sk.ca> From: Scot Thiesson To: Linac Eng Subject: P.S. ... once again... templates are really nifty.... Date: Wed, 2 May 2001 12:07:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Subject: Manufacturer: Model: Type: S/N: Software Version: Problem Description: Problem Solution: ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: mlc problems Message-ID: <7A3389A8D723D511B2260008C7B2BF390D5BC9@wmhmail.whs.org> From: "Williams, Rod" To: "'Ole@medfys.aau.dk'" , linac-eng@plato1.aristotle.net Cc: Richard.Newby@gstt.sthames.nhs.uk Subject: RE: mlc problems Date: Wed, 2 May 2001 09:12:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is this a 120 ? new millennium? If it is check your software rev the 6.2 takes care of port film problems. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL > -----Original Message----- > From: Ole@medfys.aau.dk [SMTP:Ole@medfys.aau.dk] > Sent: Wednesday, May 02, 2001 1:13 PM > To: linac-eng@plato1.aristotle.net > Cc: Richard.Newby@gstt.sthames.nhs.uk > Subject: RE: mlc problems > > Ole's first rule = > 1. If somebody talks about an accelerator without mentioning the > manufacturer its a VARIAN.... > > > > From: Richard.Newby@gstt.sthames.nhs.uk > To: lmoore@sjha.org, linac-eng@plato1.aristotle.net > Subject: RE: mlc problems > Date sent: Wed, 2 May 2001 16:52:48 +0100 > > > PLease lets us know which manufacturer!!!!!!!!!!!!!!!!!!!!!!!!!!!!! > > > > -----Original Message----- > > From: Moore, Lee [mailto:lmoore@sjha.org] > > Sent: 02 May 2001 16:01 > > To: 'linac-eng@plato1.aristotle.net' > > Subject: mlc problems > > > > > > We are currently having intermittent mlc failures with our "B" side > stuck > > in the middle of the field during or after port films. I have replaced > both > > mot comm pcb,combo comm pcb in the controller computer as well as all > parts > > associated with the B side in the head assembly(motor driver, head > xceiver, > > secondary feedback pcb, motor interconnect pcb, optical emitter, > optical > > receiver, encoder strip, carriage microswitch). Also checked all motor > > currrents on b side, when I noticed 3 of the leafs were out of > tolerence. I > > replaced motor, leaf drive screw, bushing and nut within leaf and > cleaned.. > > Motor currents are still in the 90 mv range. Not sure if this is the > source > > of my intermittant problems or not, but was wondering if anyone has > replaced > > individual leafs on their systems or had any suggestions. Thanks in > > advance. > > > > Ole G. Nielsen > Department of Medical Physics > Aarhus University Hospital > 8000 Aarhus C > Denmark > > Voice +8949.2487 > Fax +8949.2590 > email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: mlc problems Message-ID: <13191DF2F51@medfys.aau.dk> From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Cc: Richard.Newby@gstt.sthames.nhs.uk Subject: RE: mlc problems Date: Wed, 2 May 2001 10:13:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ole's first rule = 1. If somebody talks about an accelerator without mentioning the manufacturer its a VARIAN.... From: Richard.Newby@gstt.sthames.nhs.uk To: lmoore@sjha.org, linac-eng@plato1.aristotle.net Subject: RE: mlc problems Date sent: Wed, 2 May 2001 16:52:48 +0100 > PLease lets us know which manufacturer!!!!!!!!!!!!!!!!!!!!!!!!!!!!! > > -----Original Message----- > From: Moore, Lee [mailto:lmoore@sjha.org] > Sent: 02 May 2001 16:01 > To: 'linac-eng@plato1.aristotle.net' > Subject: mlc problems > > > We are currently having intermittent mlc failures with our "B" side stuck > in the middle of the field during or after port films. I have replaced both > mot comm pcb,combo comm pcb in the controller computer as well as all parts > associated with the B side in the head assembly(motor driver, head xceiver, > secondary feedback pcb, motor interconnect pcb, optical emitter, optical > receiver, encoder strip, carriage microswitch). Also checked all motor > currrents on b side, when I noticed 3 of the leafs were out of tolerence. I > replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. > Motor currents are still in the 90 mv range. Not sure if this is the source > of my intermittant problems or not, but was wondering if anyone has replaced > individual leafs on their systems or had any suggestions. Thanks in > advance. Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: mlc problems Message-ID: From: "Moore, Lee" To: "'Richard.Newby@gstt.sthames.nhs.uk'" , linac-eng@plato1.aristotle.net Subject: RE: mlc problems Date: Wed, 2 May 2001 07:52:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry, this is a varian mark 2.5 80 leaf system. -----Original Message----- From: Richard.Newby@gstt.sthames.nhs.uk [mailto:Richard.Newby@gstt.sthames.nhs.uk] Sent: Wednesday, May 02, 2001 11:53 AM To: Moore, Lee; linac-eng@plato1.aristotle.net Subject: RE: mlc problems PLease lets us know which manufacturer!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -----Original Message----- From: Moore, Lee [mailto:lmoore@sjha.org] Sent: 02 May 2001 16:01 To: 'linac-eng@plato1.aristotle.net' Subject: mlc problems We are currently having intermittent mlc failures with our "B" side stuck in the middle of the field during or after port films. I have replaced both mot comm pcb,combo comm pcb in the controller computer as well as all parts associated with the B side in the head assembly(motor driver, head xceiver, secondary feedback pcb, motor interconnect pcb, optical emitter, optical receiver, encoder strip, carriage microswitch). Also checked all motor currrents on b side, when I noticed 3 of the leafs were out of tolerence. I replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. Motor currents are still in the 90 mv range. Not sure if this is the source of my intermittant problems or not, but was wondering if anyone has replaced individual leafs on their systems or had any suggestions. Thanks in advance. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: mlc problems Message-ID: <4E70C8C9D92CD411BE790008C7F377358550D9@ex1.gstt.sthames.nhs.uk> From: Richard.Newby@gstt.sthames.nhs.uk To: lmoore@sjha.org, linac-eng@plato1.aristotle.net Subject: RE: mlc problems Date: Wed, 2 May 2001 07:52:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" PLease lets us know which manufacturer!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -----Original Message----- From: Moore, Lee [mailto:lmoore@sjha.org] Sent: 02 May 2001 16:01 To: 'linac-eng@plato1.aristotle.net' Subject: mlc problems We are currently having intermittent mlc failures with our "B" side stuck in the middle of the field during or after port films. I have replaced both mot comm pcb,combo comm pcb in the controller computer as well as all parts associated with the B side in the head assembly(motor driver, head xceiver, secondary feedback pcb, motor interconnect pcb, optical emitter, optical receiver, encoder strip, carriage microswitch). Also checked all motor currrents on b side, when I noticed 3 of the leafs were out of tolerence. I replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. Motor currents are still in the 90 mv range. Not sure if this is the source of my intermittant problems or not, but was wondering if anyone has replaced individual leafs on their systems or had any suggestions. Thanks in advance. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: mlc problems Message-ID: From: "Moore, Lee" To: "'linac-eng@plato1.aristotle.net'" Subject: mlc problems Date: Wed, 2 May 2001 07:00:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are currently having intermittent mlc failures with our "B" side stuck in the middle of the field during or after port films. I have replaced both mot comm pcb,combo comm pcb in the controller computer as well as all parts associated with the B side in the head assembly(motor driver, head xceiver, secondary feedback pcb, motor interconnect pcb, optical emitter, optical receiver, encoder strip, carriage microswitch). Also checked all motor currrents on b side, when I noticed 3 of the leafs were out of tolerence. I replaced motor, leaf drive screw, bushing and nut within leaf and cleaned.. Motor currents are still in the 90 mv range. Not sure if this is the source of my intermittant problems or not, but was wondering if anyone has replaced individual leafs on their systems or had any suggestions. Thanks in advance. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Keypads for Siemens Linacs Message-ID: <53.577c261.28216892@aol.com> From: Radsrus@aol.com To: Linacspares@freeze.com, linac-eng@plato1.aristotle.net Subject: Re: Keypads for Siemens Linacs Date: Wed, 2 May 2001 05:41:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anyone know this guy? Steve In a message dated 5/2/2001 6:22:06 AM Central Daylight Time, Linacspares@freeze.com writes: Subj:Keypads for Siemens Linacs Date:5/2/2001 6:22:06 AM Central Daylight Time From: Linacspares@freeze.com (Roger Davis) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net Hi We have got stocks of the following items for sale. If anybody is interested in ordering, please contact me. Keypad for Siemens Hand control A66 Left/Right Touch panel for Siemens ZXT couch Siemens don't sell these items individually; if you need them, you have to order the complete hand control or ZXT panel Regards Roger The information contained in this e-mail message is intended only for the personal and confidential use of the recipient(s) named above. This message is an internal company management communication and/or work product and as such is privileged and confidential. If the reader of this message is not the intended recipient,you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify me immediately by e-mail, and delete the original message. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Keypads for Siemens Linacs Message-ID: <20010502102211.12742.qmail@purina.chek.com> From: Roger Davis To: linac-eng@plato1.aristotle.net Subject: Keypads for Siemens Linacs Date: Wed, 2 May 2001 02:22:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi We have got stocks of the following items for sale. If anybody is interested in ordering, please contact me. Keypad for Siemens Hand control A66 Left/Right Touch panel for Siemens ZXT couch Siemens don't sell these items individually; if you need them, you have to order the complete hand control or ZXT panel Regards Roger ********************************************* Do you use clip art? If so, check out http://clipart.freeze.com! ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Ximatron control console Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: villegaj@hotmail.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Ximatron control console Date: Tue, 1 May 2001 22:21:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jose, Some time ago the same problem was reported. That turned out to be high temperature in the console. Because we sometimes had simmilar effects we built a fan into the console and after that our problems wer gone. But maybe your problem has a different cause....... Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl > -----Original Message----- > From: Jose Villegas [SMTP:villegaj@hotmail.com] > Sent: Tuesday, May 01, 2001 4:42 PM > To: linac-eng@plato1.aristotle.net > Subject: Ximatron control console > > Hi guys, > I am having problem with the control console, loosing communication, > suddenly will start beeping and loose all motor function from console; > hand pendant still OK, some time will solve problem by rebooting, any > experience with this type of problem? > thanks . > > Jose. > > _____ > > Get your FREE download of MSN Explorer at > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron control console Message-ID: From: Dave Pinchin To: villegaj@hotmail.com, linac-eng@plato1.aristotle.net Subject: Re: Ximatron control console Date: Tue, 1 May 2001 15:00:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Another thought about the MEbuttons on the joysticks. I had a problem which was NOT AT ALL clear. The buttons were open cct sometimes but replacing the buttons made no difference. The problem was traced in the end to the connector where to JS plugs into the PCB. The wires were too small but were crimped anyway. Resulting in the crimp holding on the insulation and cutting the conductors. Hence intermitence. Of the 8 (or so) wires checked I found 3 faulty. Easy to check just give each of the white wires a tug where they enter the header plugs. The faulty ones stretch moderately easily. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <725E0331330BD4119A0500062905E2B9164948@beatrice.trcc.org> From: "Hughes, William H." To: "'Linac-eng@plato1.aristotle.net'" Subject: Date: Tue, 1 May 2001 11:09:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Would anyone know where I might find a replacement timer for our old GE Maximar100. The current libel-flischman has lost it's mind ( Imean motor ) and we would like to try and keep this running. Thank you in advance. Bill Hughes ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron control console Message-ID: <3AEEFFC2.3B6BCE55@yale.edu> From: "Peter E. Vitali" To: Jose Villegas Cc: linac-eng@plato1.aristotle.net Subject: Re: Ximatron control console Date: Tue, 1 May 2001 10:27:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Jose: In the attachment are the numbers I spoke about. This is for the older non-King Fisher Type machine with console board part number: TM55134000. The File is a Microsoft's EXCEL File. I never found what was causing the problem in the power supply, replaced quite a few parts, so I ordered a new board. I can tell you what the problem was: The +/- 10 Volt supply was 9 volts. I do not know if the voltage regulators are available. Something was sucking down the supply. New board fixed the problem. If you find out what is doing it let me know. Hope this helps. Peter E. Vitali, CBET Therapeutic Radiological Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_002_01C19968.260B5550 Content-Type: application/vnd.ms-excel; x-mac-type="584C5338"; x-mac-creator="5843454C"; name="Xim Console Voltages" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Xim Console Voltages" Content-Description: Unknown Document 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAABAAAAAQAAAAAAAAAA EAAAFAAAAAEAAAD+////AAAAAAAAAAD///////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// 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message/rfc822 Content-Description: RE: Ximatron control console Message-ID: <9C688FB52A05D51194750002B325B5F714F73C@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'Jose Villegas' , linac-eng@plato1.aristotle.net Subject: RE: Ximatron control console Date: Tue, 1 May 2001 07:00:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have seen this when a wire is breaking off of one of the motion control pots. It may be intermittent right now, just on the verge of breaking. Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 -----Original Message----- From: Jose Villegas [mailto:villegaj@hotmail.com] Sent: 01 May, 2001 10:42 AM To: linac-eng@plato1.aristotle.net Subject: Ximatron control console Hi guys, I am having problem with the control console, loosing communication, suddenly will start beeping and loose all motor function from console; hand pendant still OK, some time will solve problem by rebooting, any experience with this type of problem? thanks . Jose. _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: autostart timer Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF98F@phsexch6.partners.org> From: "Maddox, Buford J" To: 'Richard Kimball' , "'Linac Engineers (E-mail)'" Subject: RE: autostart timer Date: Tue, 1 May 2001 06:54:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My neighbor uses x10 timers to run his whole house. When I go on vacation, I borrow some, and he runs my house, too! We found it necessary to program the Primus timer for all day, after therapist forgot to turn on machine, and it shut down at 10 am during a patient treatment. It is easy set it to do the same program on a weekend day for physics. How much extra time are people using? > -----Original Message----- > From: Richard Kimball [SMTP:kimball@core.com] > Sent: Saturday, April 28, 2001 8:18 AM > To: 'Linac Engineers (E-mail)' > Subject: Re: autostart timer > > While we are talking about timers: > > Once upon a time, I configured an IBM Home Director module (smarthome.com) > along with a mini timer, some X10 modules and a universal interface X10 > relay to turn on/off Varian HE units, the MLC controllers, the VARiS > computers and all monitors. The Home director was the master timer being > able to be programmed with a laptop set to 'anything' you wanted, with the > mini-timers at the console for the therapists to turn everything on in the > event of an 'on call' situation. Still is working well as far as I know. > The universal interface was wired into the electronics cabinet standby > keyswitch with the X10 module (appliance type) turning on a power strip > where all the computers, controllers and monitors were plugged. What made it > nice was that all equipment was on the same phase so X10 signals flowed > freely. I did modify the mini-timers to not allow 'All units off' as once a > therapist hit that before the other units were done for the day. Oopps! > > Rich Kimball > Acceletronics, Inc. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Ximatron control console Message-ID: From: Jose Villegas To: linac-eng@plato1.aristotle.net Subject: Ximatron control console Date: Tue, 1 May 2001 06:42:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi guys, I am having problem with the control console, loosing communication, suddenly will start beeping and loose all motor function from console; hand pendant still OK, some time will solve problem by rebooting, any experience with this type of problem? thanks . Jose. _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: ETR couch panels p/n 883220-02 (membrain thumbwheels type ) for free Message-ID: From: Rtsolution@aol.com To: linac-eng@plato1.aristotle.net Subject: ETR couch panels p/n 883220-02 (membrain thumbwheels type ) for f ree Date: Mon, 30 Apr 2001 23:04:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone want the panels for free ? If no reply within a week I will dispose them (4 off). RT Solution ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Fwd: Siemens Stabiliplan insert Message-ID: From: Keith Broderick To: linac-eng@plato1.aristotle.net Subject: Fwd: Siemens Stabiliplan insert Date: Mon, 30 Apr 2001 22:00:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: message/rfc822 From: Keith Broderick To: majordomo@health.qld.gov.au Subject: Siemens Stabiliplan insert Date: Mon, 30 Apr 2001 20:21:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain Gentlemen, We are seeking a Siemens Stabiliplan insert for our centre. Our unit has approx 2 years life left in it, and we are seeking an insert which will carry out useful service in that time. Specifications for the insert are: part no.s - 112 908 9V3 005 or TR300f (this insert is rated for 300KV running continuously at 12mA) We are prepared to accept a second hand device which will perform as close as possible to these specifications. Neil Contarino Royal Brisbane Hospital, AUSTRALIA X-Ray Engineering Department Bio-medical Technical Services. Phone: International access code 61 7 3636 8460 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Ximatron bucky ?????????? Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Ximatron bucky ?????????? Date: Sun, 29 Apr 2001 17:06:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, We have an aging Ximatron (Fischer microX series) that exhibits the following problem. On turn on the unit powers up into rad. with NOTbucky selected. Swap to fluoro and NOTbucky light goes out. Swap back to Rad and the NOTbucky remains out. This has started today and has me very puzzled. Any suggestions??????? Dave. :( ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100CD Machine Temp Message-ID: From: Vincent Reynolds To: linac-eng@plato1.aristotle.net Subject: Varian 2100CD Machine Temp Date: Sun, 29 Apr 2001 14:47:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Whilst the topic is around m/c temps! In standby our 2100 sits correctly at 40c-but observation shows that just after beam on the temp rises to 42c-43c-then in a few minites settles to 40c. Is this normal?Its just that I have never thought of looking at it before! Thanks Vince Reynolds Royal North Shore Hospital Sydney ********************************************************************* This message is intended for the addressee named and may contain confidential information. If you are not the intended recipient, please delete it and notify the sender. Views expressed in this message are those of the individual sender, and are not necessarily the views of NSW Health. ********************************************************************* ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: autostart timer Message-ID: <000701c0cfdd$475eefa0$0100a8c0@mshome.net> From: Richard Kimball To: "'Linac Engineers (E-mail)'" Subject: Re: autostart timer Date: Sat, 28 Apr 2001 04:18:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" While we are talking about timers: Once upon a time, I configured an IBM Home Director module (smarthome.com) along with a mini timer, some X10 modules and a universal interface X10 relay to turn on/off Varian HE units, the MLC controllers, the VARiS computers and all monitors. The Home director was the master timer being able to be programmed with a laptop set to 'anything' you wanted, with the mini-timers at the console for the therapists to turn everything on in the event of an 'on call' situation. Still is working well as far as I know. The universal interface was wired into the electronics cabinet standby keyswitch with the X10 module (appliance type) turning on a power strip where all the computers, controllers and monitors were plugged. What made it nice was that all equipment was on the same phase so X10 signals flowed freely. I did modify the mini-timers to not allow 'All units off' as once a therapist hit that before the other units were done for the day. Oopps! Rich Kimball Acceletronics, Inc. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens autostart timer Message-ID: <001e01c0cf6e$489aa360$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: "'Linac Engineers (E-mail)'" Subject: Siemens autostart timer Date: Fri, 27 Apr 2001 15:03:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks,My faulty memory has been corrected by this and other, more direct, replies. Still, the machines in some clinics program for autostart 7 days a week, presumably for those physicists who can't stay away from weekend work. John -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Maddox, Buford J Sent: Friday, April 27, 2001 2:24 PM To: 'jsomers@accuray.com'; 'Peter E. Vitali'; 'Tim Cullen' Cc: 'Williams, Rod'; 'Linac Engineers (E-mail)' Subject: RE: Varian waterfilter Our Siemens Primus has the auto timer, which must run the same hours every day, but can be programmed for which days to turn on the machine. IE, no weekend days. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF98E@phsexch6.partners.org> From: "Maddox, Buford J" To: "'jsomers@accuray.com'" , "'Peter E. Vitali'" , 'Tim Cullen' Cc: "'Williams, Rod'" , "'Linac Engineers (E-mail)'" Subject: RE: Varian waterfilter Date: Fri, 27 Apr 2001 13:24:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Our Siemens Primus has the auto timer, which must run the same hours every day, but can be programmed for which days to turn on the machine. IE, no weekend days. > -----Original Message----- > From: John Somers [SMTP:jsomers@accuray.com] > Sent: Friday, April 27, 2001 2:00 PM > To: 'Peter E. Vitali'; 'Tim Cullen' > Cc: 'Williams, Rod'; 'Linac Engineers (E-mail)' > Subject: RE: Varian waterfilter > > Peter, the Siemens machines also run at 104 degrees F, 40 degrees C. Same > reason as Varian's, for constant temp stability of the guide. > Siemens has an autostart option available, a timer which will turn > the > machine on at a preset early hour. Then it can be stabilized, tubes > warmed > up and ready for beam when the staff shows up. However this will happen 7 > days a week, so it is wired to also turn the machine off at a preset time, > say 10 a.m., unless the staff turns the Power On key in the stand before > that time. This sometimes causes unexpected mid-morning shutdowns if they > forget to turn the key when they show up. > It seems like it would be pretty easy to install your own > programmable > timer circuit like this on a Varian machine. > > > John Somers > > > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Peter E. > Vitali > Sent: Friday, April 27, 2001 8:53 AM > To: Tim Cullen > Cc: Williams, Rod; Linac Engineers (E-mail) > Subject: Re: Varian waterfilter > > > Morning all: One of the reason for keeping the water flowing is that you > maintain the system at a constant temperature. Have you ever noticed how > long it takes to clear the BMAG interlock to clear if you start the > machine > after it has gone down to room temperature for a long time. Also the > recommended time that the tube manufactures require to have the tubes > warmed > up before hitting them with high voltage is longer than 12 minutes, more > like 20 minutes. Don't forget the machine is running at 40 degrees C > which > is around 104 degrees F. This is more like 30 degrees F hotter than the > normal room temperature. I believe that the other manufacturers have > their > machine around 20 to 25 degrees C which is around normal room > temperature. Therefore those machines would only have to come up a few > degrees at start up. Why Varian run their machines around 40 degrees C I > do > not know. > > Peter E. Vitali, CBET > Therapeutic Radiologic Engineer > Yale New Haven Hospital > 20 York Street, HRT 22 > New Haven, CT. 06504 > Phone: (203) 688-2948 > FAX: (203) 688-3663 > E-mail: peter.vitali@yale.edu > > > As usual, everything I say may be plausibly denied at my employer's > convenience... > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <001001c0cf43$d92baad0$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: "'Peter E. Vitali'" , 'Tim Cullen' Cc: "'Williams, Rod'" , "'Linac Engineers (E-mail)'" Subject: RE: Varian waterfilter Date: Fri, 27 Apr 2001 09:59:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, the Siemens machines also run at 104 degrees F, 40 degrees C. Same reason as Varian's, for constant temp stability of the guide. Siemens has an autostart option available, a timer which will turn the machine on at a preset early hour. Then it can be stabilized, tubes warmed up and ready for beam when the staff shows up. However this will happen 7 days a week, so it is wired to also turn the machine off at a preset time, say 10 a.m., unless the staff turns the Power On key in the stand before that time. This sometimes causes unexpected mid-morning shutdowns if they forget to turn the key when they show up. It seems like it would be pretty easy to install your own programmable timer circuit like this on a Varian machine. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Peter E. Vitali Sent: Friday, April 27, 2001 8:53 AM To: Tim Cullen Cc: Williams, Rod; Linac Engineers (E-mail) Subject: Re: Varian waterfilter Morning all: One of the reason for keeping the water flowing is that you maintain the system at a constant temperature. Have you ever noticed how long it takes to clear the BMAG interlock to clear if you start the machine after it has gone down to room temperature for a long time. Also the recommended time that the tube manufactures require to have the tubes warmed up before hitting them with high voltage is longer than 12 minutes, more like 20 minutes. Don't forget the machine is running at 40 degrees C which is around 104 degrees F. This is more like 30 degrees F hotter than the normal room temperature. I believe that the other manufacturers have their machine around 20 to 25 degrees C which is around normal room temperature. Therefore those machines would only have to come up a few degrees at start up. Why Varian run their machines around 40 degrees C I do not know. Peter E. Vitali, CBET Therapeutic Radiologic Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian waterfilter Message-ID: <3AE9AA34.E15F135C@scf.sk.ca> From: Scot Thiesson To: "Peter E. Vitali" Cc: Tim Cullen , "Williams, Rod" , "Linac Engineers (E-mail)" Subject: Re: Varian waterfilter Date: Fri, 27 Apr 2001 09:19:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "Peter E. Vitali" wrote: > Why Varian run their machines around 40 degrees C I do not know. I only have one thing to add to the list you mentioned. Other than the fact that the klystron needs to be warm and at a stable temperature to operate reliably, the RF seals just seal better at a higher temperature. If you've ever experienced a small SF6 leak at operational temperatures you will notice that the leak gets much worse as the machine cools down and 'opens' up. Things just seal better when they are warm especially if they were put together cold. The guys who designed the Challenger knew that. As for the operational temperatures of the other manufacturers; I know the older Siemens machines were also running at fourty degrees C. One of the reasons is the efficiency of the four port circulators. They can be so cantankerous at low temperatures that they just short out. Scot Thiesson Sr. physics tech. A.B.C.C. Regina Sask. Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian waterfilter Message-ID: <3AE995A6.A45073ED@yale.edu> From: "Peter E. Vitali" To: Tim Cullen Cc: "Williams, Rod" , "Linac Engineers (E-mail)" Subject: Re: Varian waterfilter Date: Fri, 27 Apr 2001 07:53:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Morning all: One of the reason for keeping the water flowing is that you maintain the system at a constant temperature. Have you ever noticed how long it takes to clear the BMAG interlock to clear if you start the machine after it has gone down to room temperature for a long time. Also the recommended time that the tube manufactures require to have the tubes warmed up before hitting them with high voltage is longer than 12 minutes, more like 20 minutes. Don't forget the machine is running at 40 degrees C which is around 104 degrees F. This is more like 30 degrees F hotter than the normal room temperature. I believe that the other manufacturers have their machine around 20 to 25 degrees C which is around normal room temperature. Therefore those machines would only have to come up a few degrees at start up. Why Varian run their machines around 40 degrees C I do not know. Peter E. Vitali, CBET Therapeutic Radiologic Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian waterfilter Message-ID: <3AE96BB8.6C37ED7D@wfubmc.edu> From: tcullen@wfubmc.edu To: "Williams, Rod" , "Linac Engineers (E-mail)" Subject: Re: Varian waterfilter Date: Fri, 27 Apr 2001 04:53:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Rod, the only thing I can think of is to try and maintain a constant system temp, which will minimize your warm-up time and help with stability. I don't have the latest versions of Varian equipment but have been told that Varian has improved on the RF system. Something to the effect of removing the T-drive variator and better control of RF power. We're in the final throes of deciding on an equipment vendor for new linacs at the moment, and if anyone has any good pro/con comments on comparison of the latest and greatest that Siemens or Varian have to offer, feel free to throw them my way. The efficiency issue has come into play here and this discussion kinda touches on that. If you know of major improvements that have been made to either of the two units (that actually work as advertised), this would be helpful also. I know what you're saying, why don't you ask the vendors. I have and it all smells like the typical rosy sales BS. We are also looking at going with mostly digital imaging (filmless) and would like to know if anyone has this in place. TIA Tim Cullen "Williams, Rod" wrote: > Does anyone know the reason Varian keeps the pump running in standby? Also I > know that Varian in the training classes have said the the R.F. drivers run > better when they are putting out full power in no mode, I have ran my old > Micon at half output in no mode for many years with no problems, with the > new solid state R.F drivers I would like to install a ckt to drop the output > to 0 in no mode. Any comments? > > Rod.Williams@phci.org > WAUKESHA MEMORIAL HOSPITAL > > > -----Original Message----- > > From: twaldron@mail.mdanderson.org [SMTP:twaldron@mail.mdanderson.org] > > Sent: Wednesday, April 25, 2001 5:42 PM > > To: jsomers@accuray.com > > Cc: 'Frank Spitz'; MLoeks@providence.org; linac-eng@plato1.aristotle.net > > Subject: RE: Varian waterfilter > > > > > > > > ...Or at least come up with some sort of cogeneration scheme to make it a > > little > > more efficient > > > > Tim > > > > > > > > > > "John Somers" on 04/25/2001 05:12:53 PM > > > > Please respond to jsomers@accuray.com > > > > To: "'Frank Spitz'" , MLoeks@providence.org > > cc: linac-eng@plato1.aristotle.net (bcc: Timothy J. Waldron/MDACC) > > > > Subject: RE: Varian waterfilter > > > > > > > > Peter and Tim have correctly pointed out that the Varian waterpumps are > > circulating water even in Machine Off state. > > This is not the case with Siemens Mevatrons, Primus, etc. nor with > > Philips/Elekta linacs, which begin pumping water only when the machines > > are > > powered On. (Same with the x-band linacs in the Intraop Mobetron and > > Accuray's Cyberknife). > > Hmmm, with the coming blackouts and power shortages looming in > > California, > > maybe the designers at Varian should rethink their position about running > > those pumps 24/7. > > > > John Somers > > > > > > > > > > > > -----Original Message----- > > From: owner-linac-eng@plato1.aristotle.net > > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Frank Spitz > > Sent: Wednesday, April 25, 2001 1:20 PM > > To: MLoeks@providence.org > > Cc: linac-eng@plato1.aristotle.net > > Subject: RE: Varian waterfilter > > > > > > Hello Marc, > > > > With regard to using a biocide rather then UV light for water > > disinfection, > > let me first say that I'm not an expert in chemistry, or water filtering, > > but > > can think of one reason why UV treatment may not be fully effective in > > removing all bacteria from a Linac. UV light is only effective where > > there > > is > > direct UV contact with the microbes. As the water is circulated past the > > UV > > lamp the light deactivates DNA leading to bacterial reduction. In most > > treatment centers however the Linac is only on an average 10 to 12 hours a > > day > > 5 days a week. While the machine is off, water and bacteria are not > > circulating past the UV light. Consequently as long as the machine is off > > bacteria is free to multiply anywhere the UV light does not shine. A > > biocide > > on the other hand is dissolved throughout the system and does not depend > > as > > much on water circulation. > > If you arrange to keep the water circulating continuously however then I > > think > > UV Purification would be a fantastic idea. The tradeoffs being circulator > > wear, and potential water damage from leaks occurring while the machine is > > unattended. > > > > > > Frank Spitz > > > > Clinical Engineer > > Thomas Jefferson University > > > > > > > > > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: RE: Varian waterfilter Message-ID: From: David Burgess To: jsomers@accuray.com, twaldron@mail.mdanderson.org, rod.williams@phci.org Cc: Frank.Spitz@mail.tju.edu, linac-eng@plato1.aristotle.net, "Loeks, Michael" Subject: Re: RE: Varian waterfilter Date: Fri, 27 Apr 2001 04:08:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Rod, I suspect Varian want the RF Driver output power, frequency and phasing to be stable at the moment of Beam On. This might have been more of a concern with tube type RF Drivers as they aged or had marginal performance. I think you should study what affect this could have on Klystron longevity. However, in my opinion, there are many areas where improvements can be made on existing Varians. If your AFC, Gun, PFN, Klystron and RF Driver are in good shape you should be able to experiment and log enough factors to determine the PRO's and CON's. Please let the list know your results - I'm always looking to make improvements also. David Burgess Nova Scotia Cancer Centre >>> "Williams, Rod" 4/27/2001 7:26:52 AM >>> Does anyone know the reason Varian keeps the pump running in standby? Also I know that Varian in the training classes have said the the R.F. drivers run better when they are putting out full power in no mode, I have ran my old Micon at half output in no mode for many years with no problems, with the new solid state R.F drivers I would like to install a ckt to drop the output to 0 in no mode. Any comments? Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL > -----Original Message----- > From: twaldron@mail.mdanderson.org [SMTP:twaldron@mail.mdanderson.org] > Sent: Wednesday, April 25, 2001 5:42 PM > To: jsomers@accuray.com > Cc: 'Frank Spitz'; MLoeks@providence.org; linac-eng@plato1.aristotle.net > Subject: RE: Varian waterfilter > > > > ...Or at least come up with some sort of cogeneration scheme to make it a > little > more efficient > > Tim > > > > > "John Somers" on 04/25/2001 05:12:53 PM > > Please respond to jsomers@accuray.com > > To: "'Frank Spitz'" , MLoeks@providence.org > cc: linac-eng@plato1.aristotle.net (bcc: Timothy J. Waldron/MDACC) > > Subject: RE: Varian waterfilter > > > > Peter and Tim have correctly pointed out that the Varian waterpumps are > circulating water even in Machine Off state. > This is not the case with Siemens Mevatrons, Primus, etc. nor with > Philips/Elekta linacs, which begin pumping water only when the machines > are > powered On. (Same with the x-band linacs in the Intraop Mobetron and > Accuray's Cyberknife). > Hmmm, with the coming blackouts and power shortages looming in > California, > maybe the designers at Varian should rethink their position about running > those pumps 24/7. > > John Somers > > > > > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Frank Spitz > Sent: Wednesday, April 25, 2001 1:20 PM > To: MLoeks@providence.org > Cc: linac-eng@plato1.aristotle.net > Subject: RE: Varian waterfilter > > > Hello Marc, > > With regard to using a biocide rather then UV light for water > disinfection, > let me first say that I'm not an expert in chemistry, or water filtering, > but > can think of one reason why UV treatment may not be fully effective in > removing all bacteria from a Linac. UV light is only effective where > there > is > direct UV contact with the microbes. As the water is circulated past the > UV > lamp the light deactivates DNA leading to bacterial reduction. In most > treatment centers however the Linac is only on an average 10 to 12 hours a > day > 5 days a week. While the machine is off, water and bacteria are not > circulating past the UV light. Consequently as long as the machine is off > bacteria is free to multiply anywhere the UV light does not shine. A > biocide > on the other hand is dissolved throughout the system and does not depend > as > much on water circulation. > If you arrange to keep the water circulating continuously however then I > think > UV Purification would be a fantastic idea. The tradeoffs being circulator > wear, and potential water damage from leaks occurring while the machine is > unattended. > > > Frank Spitz > > Clinical Engineer > Thomas Jefferson University > > > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <7A3389A8D723D511B2260008C7B2BF390D5BC4@wmhmail.whs.org> From: "Williams, Rod" To: "'twaldron@mail.mdanderson.org'" , jsomers@accuray.com Cc: 'Frank Spitz' , "Loeks, Michael" , linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Date: Fri, 27 Apr 2001 02:26:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone know the reason Varian keeps the pump running in standby? Also I know that Varian in the training classes have said the the R.F. drivers run better when they are putting out full power in no mode, I have ran my old Micon at half output in no mode for many years with no problems, with the new solid state R.F drivers I would like to install a ckt to drop the output to 0 in no mode. Any comments? Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL > -----Original Message----- > From: twaldron@mail.mdanderson.org [SMTP:twaldron@mail.mdanderson.org] > Sent: Wednesday, April 25, 2001 5:42 PM > To: jsomers@accuray.com > Cc: 'Frank Spitz'; MLoeks@providence.org; linac-eng@plato1.aristotle.net > Subject: RE: Varian waterfilter > > > > ...Or at least come up with some sort of cogeneration scheme to make it a > little > more efficient > > Tim > > > > > "John Somers" on 04/25/2001 05:12:53 PM > > Please respond to jsomers@accuray.com > > To: "'Frank Spitz'" , MLoeks@providence.org > cc: linac-eng@plato1.aristotle.net (bcc: Timothy J. Waldron/MDACC) > > Subject: RE: Varian waterfilter > > > > Peter and Tim have correctly pointed out that the Varian waterpumps are > circulating water even in Machine Off state. > This is not the case with Siemens Mevatrons, Primus, etc. nor with > Philips/Elekta linacs, which begin pumping water only when the machines > are > powered On. (Same with the x-band linacs in the Intraop Mobetron and > Accuray's Cyberknife). > Hmmm, with the coming blackouts and power shortages looming in > California, > maybe the designers at Varian should rethink their position about running > those pumps 24/7. > > John Somers > > > > > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Frank Spitz > Sent: Wednesday, April 25, 2001 1:20 PM > To: MLoeks@providence.org > Cc: linac-eng@plato1.aristotle.net > Subject: RE: Varian waterfilter > > > Hello Marc, > > With regard to using a biocide rather then UV light for water > disinfection, > let me first say that I'm not an expert in chemistry, or water filtering, > but > can think of one reason why UV treatment may not be fully effective in > removing all bacteria from a Linac. UV light is only effective where > there > is > direct UV contact with the microbes. As the water is circulated past the > UV > lamp the light deactivates DNA leading to bacterial reduction. In most > treatment centers however the Linac is only on an average 10 to 12 hours a > day > 5 days a week. While the machine is off, water and bacteria are not > circulating past the UV light. Consequently as long as the machine is off > bacteria is free to multiply anywhere the UV light does not shine. A > biocide > on the other hand is dissolved throughout the system and does not depend > as > much on water circulation. > If you arrange to keep the water circulating continuously however then I > think > UV Purification would be a fantastic idea. The tradeoffs being circulator > wear, and potential water damage from leaks occurring while the machine is > unattended. > > > Frank Spitz > > Clinical Engineer > Thomas Jefferson University > > > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <725E0331330BD4119A0500062905E2B9164945@beatrice.trcc.org> From: "Hughes, William H." To: "'linac-eng@plato1.aristotle.net'" Subject: Date: Thu, 26 Apr 2001 13:52:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, Would anyone out there have the pleasure of doing a CT-Sim upgrade and installing a Varian Exact couch top on a G.E. CT Advantage? If so, could you be so kind as to let our facility know the approximate cost of your couch top and the location that you purchased it from. Thank you in advance to any respondents. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Water filter Message-ID: <4BD1673C955CD41182DA00508BACF2DF08482D@YGC-MAIL> From: "Carfoot, Sidney" To: "'linac-eng@plato1.aristotle.net'" Subject: Water filter Date: Thu, 26 Apr 2001 00:28:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There is a CTB on the Varian Site. CTB-WA-164A Regards Sid Carfoot ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <86256A39.007CDDB3.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: jsomers@accuray.com Cc: 'Frank Spitz' , "Loeks, Michael" , linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Date: Wed, 25 Apr 2001 14:42:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ...Or at least come up with some sort of cogeneration scheme to make it a little more efficient Tim "John Somers" on 04/25/2001 05:12:53 PM Please respond to jsomers@accuray.com To: "'Frank Spitz'" , MLoeks@providence.org cc: linac-eng@plato1.aristotle.net (bcc: Timothy J. Waldron/MDACC) Subject: RE: Varian waterfilter Peter and Tim have correctly pointed out that the Varian waterpumps are circulating water even in Machine Off state. This is not the case with Siemens Mevatrons, Primus, etc. nor with Philips/Elekta linacs, which begin pumping water only when the machines are powered On. (Same with the x-band linacs in the Intraop Mobetron and Accuray's Cyberknife). Hmmm, with the coming blackouts and power shortages looming in California, maybe the designers at Varian should rethink their position about running those pumps 24/7. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Frank Spitz Sent: Wednesday, April 25, 2001 1:20 PM To: MLoeks@providence.org Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Hello Marc, With regard to using a biocide rather then UV light for water disinfection, let me first say that I'm not an expert in chemistry, or water filtering, but can think of one reason why UV treatment may not be fully effective in removing all bacteria from a Linac. UV light is only effective where there is direct UV contact with the microbes. As the water is circulated past the UV lamp the light deactivates DNA leading to bacterial reduction. In most treatment centers however the Linac is only on an average 10 to 12 hours a day 5 days a week. While the machine is off, water and bacteria are not circulating past the UV light. Consequently as long as the machine is off bacteria is free to multiply anywhere the UV light does not shine. A biocide on the other hand is dissolved throughout the system and does not depend as much on water circulation. If you arrange to keep the water circulating continuously however then I think UV Purification would be a fantastic idea. The tradeoffs being circulator wear, and potential water damage from leaks occurring while the machine is unattended. Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <000e01c0cdd4$e0894ff0$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: 'Frank Spitz' , "Loeks, Michael" Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Date: Wed, 25 Apr 2001 14:12:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter and Tim have correctly pointed out that the Varian waterpumps are circulating water even in Machine Off state. This is not the case with Siemens Mevatrons, Primus, etc. nor with Philips/Elekta linacs, which begin pumping water only when the machines are powered On. (Same with the x-band linacs in the Intraop Mobetron and Accuray's Cyberknife). Hmmm, with the coming blackouts and power shortages looming in California, maybe the designers at Varian should rethink their position about running those pumps 24/7. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Frank Spitz Sent: Wednesday, April 25, 2001 1:20 PM To: MLoeks@providence.org Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Hello Marc, With regard to using a biocide rather then UV light for water disinfection, let me first say that I'm not an expert in chemistry, or water filtering, but can think of one reason why UV treatment may not be fully effective in removing all bacteria from a Linac. UV light is only effective where there is direct UV contact with the microbes. As the water is circulated past the UV lamp the light deactivates DNA leading to bacterial reduction. In most treatment centers however the Linac is only on an average 10 to 12 hours a day 5 days a week. While the machine is off, water and bacteria are not circulating past the UV light. Consequently as long as the machine is off bacteria is free to multiply anywhere the UV light does not shine. A biocide on the other hand is dissolved throughout the system and does not depend as much on water circulation. If you arrange to keep the water circulating continuously however then I think UV Purification would be a fantastic idea. The tradeoffs being circulator wear, and potential water damage from leaks occurring while the machine is unattended. Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: <86256A39.007267B1.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: Frank Spitz Cc: "Loeks, Michael" , linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Date: Wed, 25 Apr 2001 12:48:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On Varian machines the water circulates so long as mains are applied, not just when the machine is "on"... Tim "Frank Spitz" on 04/25/2001 03:20:10 PM To: MLoeks@providence.org cc: linac-eng@plato1.aristotle.net (bcc: Timothy J. Waldron/MDACC) Subject: RE: Varian waterfilter Hello Marc, With regard to using a biocide rather then UV light for water disinfection, let me first say that I'm not an expert in chemistry, or water filtering, but can think of one reason why UV treatment may not be fully effective in removing all bacteria from a Linac. UV light is only effective where there is direct UV contact with the microbes. As the water is circulated past the UV lamp the light deactivates DNA leading to bacterial reduction. In most treatment centers however the Linac is only on an average 10 to 12 hours a day 5 days a week. While the machine is off, water and bacteria are not circulating past the UV light. Consequently as long as the machine is off bacteria is free to multiply anywhere the UV light does not shine. A biocide on the other hand is dissolved throughout the system and does not depend as much on water circulation. If you arrange to keep the water circulating continuously however then I think UV Purification would be a fantastic idea. The tradeoffs being circulator wear, and potential water damage from leaks occurring while the machine is unattended. Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian waterfilter Message-ID: <3AE7344D.EEE455D2@yale.edu> From: "Peter E. Vitali" To: Frank Spitz Cc: "Loeks, Michael" , linac-eng@plato1.aristotle.net Subject: Re: Varian waterfilter Date: Wed, 25 Apr 2001 12:34:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Frank: On the 2100C the water is running 24 hours a day, everyday of the year. The only time it is off is when you have a power failure or you completely shut down the machine when you are working on it. Peter E. Vitali, CBET Therapeutic Radiologic Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian waterfilter Message-ID: From: Frank Spitz To: "Loeks, Michael" Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian waterfilter Date: Wed, 25 Apr 2001 12:20:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Marc, With regard to using a biocide rather then UV light for water disinfection, let me first say that I'm not an expert in chemistry, or water filtering, but can think of one reason why UV treatment may not be fully effective in removing all bacteria from a Linac. UV light is only effective where there is direct UV contact with the microbes. As the water is circulated past the UV lamp the light deactivates DNA leading to bacterial reduction. In most treatment centers however the Linac is only on an average 10 to 12 hours a day 5 days a week. While the machine is off, water and bacteria are not circulating past the UV light. Consequently as long as the machine is off bacteria is free to multiply anywhere the UV light does not shine. A biocide on the other hand is dissolved throughout the system and does not depend as much on water circulation. If you arrange to keep the water circulating continuously however then I think UV Purification would be a fantastic idea. The tradeoffs being circulator wear, and potential water damage from leaks occurring while the machine is unattended. Frank Spitz Clinical Engineer Thomas Jefferson University ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Virtual simulator Message-ID: <000201c0ccdc$2f91ce50$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: SMcna39074@aol.com, linac-eng@plato1.aristotle.net Subject: RE: Virtual simulator Date: Tue, 24 Apr 2001 08:32:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Stan and listmembers, It is my understanding that the ADAC Pinnacle treatment planning system can also provide virtual simulator capabilities when used in tandem with a suitable CT scanner. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of SMcna39074@aol.com Sent: Monday, April 23, 2001 9:32 PM To: linac-eng@plato1.aristotle.net Subject: Re: Virtual simulator Virtual simulator machines (CT with external computer) are made by Marconi (AccuSim) and GE. Note to majordomo: I am not receiving original posts of messages only members replies. Reason? Stan McNally Cancer Center of Santa Barbara, Ca Smcna39074@aol.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta SL 20 relays Message-ID: <3AE57B56.473938B4@yale.edu> From: "Peter E. Vitali" To: "Rozenblat, Alex" Cc: "Linac-Engineers, Listserver" Subject: Re: Elekta SL 20 relays Date: Tue, 24 Apr 2001 05:11:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Alex: The Company is Relay Specialties inc. 1-800-526-5376. They are located in New Jersey. Web site: www.relayspec.com. They may be able to cross them to another manufacturer. "Rozenblat, Alex" wrote: > Peter, > > It's a wonderful information but do you know supplier or place to get them > because Siemens stopped producing them several years ago. (Please, don't > mention Electa). > > Alex Rozenblat, > TSRCC, Toronto, Canada > > -----Original Message----- > From: Peter E. Vitali [mailto:peter.vitali@yale.edu] > Sent: Friday, April 20, 2001 3:20 PM > To: Denny Yu > Cc: linac-eng@plato1.aristotle.net; 'canadalist@egroups.com' > Subject: Re: Elekta SL 20 relays > > Denny: The relay is a Miniature power relay N made by Siemens. I found it > in a 1983/84 data book. > > >From the Data Book: > > Miniature power relay N V23016-D....-A.9. for direct mounting into printed > circuits with a solder pin for additional fixing. Pin arrangement for > 2.5mm grid in accordance with DIN 40801 and DIN 40803, fine. > > Block 1 = Basic Type number Ex V23016- > > Block 2 = Coil number EX D0006 > > Block 3 = Contact arrangement EX A191 > > Std Types at that time was V23016-D0006-A191 > > 0006 = 24Vdc nominal Min 16.8 and Max of 44 coil Resistance = 970+/- > 144 > > A191 = Silver, gold-flashed contacts Single pole/ double throw. Max making > /breaking power with dc voltages 55-420W (voltage dependent) > > D = Contact Version for type V23016-D..... digit 14 of ordering block 3 > insert: > 0 = for version with screw fixing > 9 = for version with solder pin. > > Hope this Helps > > Peter E. Vitali, CBET > Therapeutic Radiologic Engineer > Yale New Haven Hospital > 20 York Street, HRT 22 > New Haven, CT. 06504 > Phone: (203) 688-2948 > FAX: (203) 688-3663 > E-mail: peter.vitali@yale.edu > > As usual, everything I say may be plausibly denied at my employer's > convenience... Pete ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: IPSN interlock during IMRT treatment Message-ID: <3AE5756B.36DA6F48@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: IPSN interlock during IMRT treatment Date: Tue, 24 Apr 2001 04:45:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We often have IPSN interlock during IMRT treatment (after beam on!!), the interlock supposes to be occur during set-up. We think it may be due to noise ( I do not know...) Could anyone advise how does the Clinac assert the IPSN interlock (during IMRT treatment)? How does the MLC pass the information to Clinac? It seems the MLC controller only receives information from Clinac, it is correct? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Virtual simulator Message-ID: From: SMcna39074@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Virtual simulator Date: Mon, 23 Apr 2001 20:32:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Virtual simulator machines (CT with external computer) are made by Marconi (AccuSim) and GE. Note to majordomo: I am not receiving original posts of messages only members replies. Reason? Stan McNally Cancer Center of Santa Barbara, Ca Smcna39074@aol.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta SL 20 relays Message-ID: <6BAF4D075F07D411B30900508B94CBA01C148D@SERVER20> From: Denny Yu To: 'Craig' Cc: linac-eng@plato1.aristotle.net Subject: Elekta SL 20 relays Date: Mon, 23 Apr 2001 12:27:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Craig, Thank you for your help. last Friday, Rob Knutson provided me with this link: http://www.tyco-electronics-amp.de/relay-catalog/family.cgi?fam_ID=30 and I was able to find the exact relay with all the spec. information and I bookmarked the same page. Called Newark, then Allied electronics, they claimed it is not a valid parts # from Tyco. Today,I searched the Tyco site, and it is no longer a valid parts #. Seems Tyco just updated its web site over the weekend?! Thanks to all those reply my inquiry. Regards, Denny Yu Fraser Valley Cancer Centre. 604 930-4051 -----Original Message----- From: Craig [ mailto:cpearce@voyager.co.nz ] Sent: Friday, April 20, 2001 2:31 PM To: 'Denny Yu' Subject: RE: Elekta SL 20 relays Denny The following link will tell you more about that relay then you will ever want to know. http://www.tyco-electronics-amp.de/relay-catalog/data.cgi?rel_id=381 &language=en cheers Craig Pearce -----Original Message----- From: Denny Yu [SMTP:DYu@bccancer.bc.ca] Sent: 21 April, 2001 04:57 To: linac-eng@plato1.aristotle.net Cc: 'canadalist@egroups.com' Subject: Elekta SL 20 relays For those who work on the Elekta Linacs, please advise if anyone has any luck in second source the Relays used in all the ROC cards. Those relays are 24 volts, SPDT, on the clear plastic casing, the #s are V23016 D0006-A191, cannot identify the manufacturer. Gone through a few electronics vendors catalogues, no luck...... Thanks. Regards, Denny Yu Fraser Valley Cancer Centre SVC Tech 604-930-4051 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Linac Engineers annual meeting Message-ID: <000a01c0cc32$79c29400$2e7c003f@7jwvh01> From: Steve Schwarz To: rwick@bccancer.bc.ca, linac-eng@plato1.aristotle.net Subject: RE: Linac Engineers annual meeting Date: Mon, 23 Apr 2001 12:17:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy, Tim is correct - the RSEA is not part of SIA, but could certainly benefit from the association. The SIA has 3 groups - the medical, computer & copier groups. Within these groups are member field service, in-house service, parts, repair & logistics companies and other non-proft organizations such as ECRI.org & AFSMI.org. Some SIA members serve on the boards of other non-profit organizations and in this way share resources together. We support the efforts of the RSEA to organize and will be there when you need us to be a corporate sponsor & member. My Regards, Steve Schwarz Acceletronics, Inc. 602 Gordon Drive Exton, PA 19341 610-524-3300 fax:3304 Subj: RE: Linac Engineers annual meeting Date: 4/23/2001 2:06:21 PM Central Daylight Time From: twaldron@mail.mdanderson.org Sender: owner-linac-eng@plato1.aristotle.net To: rwick@bccancer.bc.ca (Randy Wick) CC: linac-eng@plato1.aristotle.net ('Linac-eng list') File: att1.htm (1286 bytes) DL Time (38666 bps): < 1 minute No. Tim Waldron Randy Wick on 04/23/2001 01:18:10 PM To: "'Linac-eng list'" cc: (bcc: Timothy J. Waldron/MDACC) Subject: RE: Linac Engineers annual meeting Is there any relationship between this group and the Service Industry Association being promoted by Steve Schwarz? -----Original Message----- From: twaldron@mail.mdanderson.org [mailto:twaldron@mail.mdanderson.org] Sent: Thursday, April 19, 2001 4:58 PM To: Urmanita, Ted Cc: 'linac-eng@plato.aristotle.net' Subject: Re: Linac Engineers annual meeting The meeting last year was arranged and roughly 50% funded by the AAPM. We did not get it together in time to have one this year, at least not in the official sense. With luck we will be able to do something in 2002. Tim Waldron ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Linac Engineers annual meeting Message-ID: From: "Orsolini, Joe D" To: 'Randy Wick' , 'Linac-eng list' Subject: RE: Linac Engineers annual meeting Date: Mon, 23 Apr 2001 11:42:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What about making it part of RSNA? > -----Original Message----- > From: Randy Wick [SMTP:rwick@bccancer.bc.ca] > Sent: Monday, April 23, 2001 14:18 > To: 'Linac-eng list' > Subject: RE: Linac Engineers annual meeting > > Is there any relationship between this group and the Service Industry > Association being promoted by Steve Schwarz? > > -----Original Message----- > From: twaldron@mail.mdanderson.org [ > ] > > Sent: Thursday, April 19, 2001 4:58 PM > To: Urmanita, Ted > Cc: 'linac-eng@plato.aristotle.net' > Subject: Re: Linac Engineers annual meeting > > > > > The meeting last year was arranged and roughly 50% funded by the AAPM. > We did not get it together in time to have one this year, at least not in > the > official sense. > With luck we will be able to do something in 2002. > > Tim Waldron > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Linac Engineers annual meeting Message-ID: <86256A37.0067BCF6.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: Randy Wick Cc: 'Linac-eng list' Subject: RE: Linac Engineers annual meeting Date: Mon, 23 Apr 2001 10:51:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" No. Tim Waldron Randy Wick on 04/23/2001 01:18:10 PM To: "'Linac-eng list'" cc: (bcc: Timothy J. Waldron/MDACC) Subject: RE: Linac Engineers annual meeting Is there any relationship between this group and the Service Industry Association being promoted by Steve Schwarz? -----Original Message----- From: twaldron@mail.mdanderson.org [mailto:twaldron@mail.mdanderson.org] Sent: Thursday, April 19, 2001 4:58 PM To: Urmanita, Ted Cc: 'linac-eng@plato.aristotle.net' Subject: Re: Linac Engineers annual meeting The meeting last year was arranged and roughly 50% funded by the AAPM. We did not get it together in time to have one this year, at least not in the official sense. With luck we will be able to do something in 2002. Tim Waldron ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/html; name="att1.htm" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="att1.htm" Content-Description: Internet HTML RE: Linac Engineers annual meeting

Is there any relationship between this group and the = Service Industry Association being promoted by Steve Schwarz?

-----Original Message-----
From: twaldron@mail.mdanderson.org [mailto:twaldron@mail.mdande= rson.org]

Sent: Thursday, April 19, 2001 4:58 PM
To: Urmanita, Ted
Cc: 'linac-eng@plato.aristotle.net'
Subject: Re: Linac Engineers annual meeting




The meeting last year was arranged and roughly 50% = funded by the AAPM.
We did not get it together in time to have one this = year, at least not in the
official sense.
With luck we will be able to do something in = 2002.

Tim Waldron

------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Linac Engineers annual meeting Message-ID: <6BAF4D075F07D411B30900508B94CBA03E5513@SERVER20> From: Randy Wick To: 'Linac-eng list' Subject: RE: Linac Engineers annual meeting Date: Mon, 23 Apr 2001 10:18:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is there any relationship between this group and the Service Industry Association being promoted by Steve Schwarz? -----Original Message----- From: twaldron@mail.mdanderson.org [ mailto:twaldron@mail.mdanderson.org ] Sent: Thursday, April 19, 2001 4:58 PM To: Urmanita, Ted Cc: 'linac-eng@plato.aristotle.net' Subject: Re: Linac Engineers annual meeting The meeting last year was arranged and roughly 50% funded by the AAPM. We did not get it together in time to have one this year, at least not in the official sense. With luck we will be able to do something in 2002. Tim Waldron ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Fwd: Positions Available Message-ID: From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: Fwd: Positions Available Date: Mon, 23 Apr 2001 09:23:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" ------_=_NextPart_002_01C19968.260B5550 Content-Type: message/rfc822 Message-ID: From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: Positions Available Date: Thu, 5 Apr 2001 15:37:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_004_01C19968.260B5550" ------_=_NextPart_004_01C19968.260B5550 Content-Type: text/plain RS&A, Inc. has positions for senior linac engineers. Must have five plus years experience and indepth training. RS&A, Inc. is an independent Service Organization based in North Carolina. We have openings at this time in both North Carolina and in Georgia. Excellent pay and benefits. Contact Carl Hill at 800-320-4332. Please visit our Web Site: http:/www.rsa-inc.com/ ------_=_NextPart_004_01C19968.260B5550-- ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Dedicated Key Boards. Message-ID: <9C688FB52A05D51194750002B325B5F714F706@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: "'Twyman, Paul'" , "'linac-eng@plato1.aristotle.net'" Subject: RE: Varian Dedicated Key Boards. Date: Mon, 23 Apr 2001 03:58:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yes they do have the newer membrane style keyboard. We ordered them from Varian and they are great. The part number for what they call the switch assembly keyboard is 87951105. This includes the keyboard and metal frame. All you have to do is move your emerg. off switch and key over and your ready to roll with no more headaches. Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 > -----Original Message----- > From: Twyman, Paul [mailto:paul.twyman@addenbrookes.nhs.uk] > Sent: 23 April, 2001 7:18 AM > To: 'linac-eng@plato1.aristotle.net' > Subject: Varian Dedicated Key Boards. > > > Hi to all. > > I recently heard that there was a newer style membrane / > matrix PCB for the > Varian DKB. The newer one utilises pushbutton style switches > as opposed to > the 'springy triangular thingy'. > I would like to find out if this is true and if it is Varian > or 'a another' > who supplies them along with a part number. > > Thanks to all who replied to my request for info on the door interlock > switches. It all proved most useful. > > Thanks in advance > Paul T > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: IEC Scale Message-ID: <018101c0cbe8$94ebb3a0$f485fea9@laptop> From: Saoude Remy To: linac-eng@plato1.aristotle.net Subject: IEC Scale Date: Mon, 23 Apr 2001 03:19:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi , Could you please give me Internet sites where I could find the specification of the various scales used in Linears Accelerator and Simulator and more specially for the IEC Scale. Looking the stand, in front of the gantry, were should be the couch when you want 90 Degree for couch rotation, on your left or on your right with IEC Scale. Same for Gantry rotation with 90 Degree IEC Scale. Thanks in advance for your documented answers. Regards to all. Remy. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Dedicated Key Boards. Message-ID: <07EBC420AD13D5118C6A0002A52865C23B1311@mail.addenbrookes.anglox.nhs.uk> From: "Twyman, Paul" To: "'linac-eng@plato1.aristotle.net'" Subject: Varian Dedicated Key Boards. Date: Mon, 23 Apr 2001 03:17:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi to all. I recently heard that there was a newer style membrane / matrix PCB for the Varian DKB. The newer one utilises pushbutton style switches as opposed to the 'springy triangular thingy'. I would like to find out if this is true and if it is Varian or 'a another' who supplies them along with a part number. Thanks to all who replied to my request for info on the door interlock switches. It all proved most useful. Thanks in advance Paul T ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Virtual simulator Message-ID: <000101c0cb92$66e325c0$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Virtual simulator Date: Sun, 22 Apr 2001 17:12:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would suggest that you discontinue the use of any "beefy" computers as they will certainly limit the dissemination of their output to the European communities at this time. Mad cow/Hoof and mouth and all that. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Dave Pinchin Sent: Sunday, April 22, 2001 7:34 PM To: linac-eng@plato1.aristotle.net Subject: Virtual simulator G'day, Our physics team is investigating virtual simulation using CT and a beefy computer. Any comments on any system would be appreciated. From the users, physics or techos point of view. The particular issue is whether this can totally do away with a simulator or not. Thanks :) Dave ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cell phones. Message-ID: <000001c0cb91$b2a18480$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Cell phones. Date: Sun, 22 Apr 2001 17:06:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" More often than not that cell tower is on the roof of that very hospital. Most hospitals in this region, possibly the entire US, rent their roof space for various RF systems- alarm, messaging, police, fire, military, civil defense, NOAA, and cellular as examples. Its easy money. As these systems are controlled under the strictest of federal regulations they are very unlikely to be the cause of any disturbances when operating within their licenses. Most problems appear to occur with marginally designed and poorly shielded systems and, I guess, wheelchairs. By the way, if you want to see a very noisy RF emitter, put a radio in the treatment room of a Varian low energy machine and listen on the intercom during beam. Doesn't appear to effect it's systems. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Dave Pinchin Sent: Sunday, April 22, 2001 5:52 PM To: linac-eng@plato1.aristotle.net Subject: Cell phones. G'day, I've noticed a phrase 'When a clinician uses a cellphone' occuring in the recent discussions I would like to suggest that it's nastier than that because the cellphone regularly contacts the celltower IRRESPECTIVE of whether the person is using the phone. All it needs is for the cellphone to be on. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Virtual simulator Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Virtual simulator Date: Sun, 22 Apr 2001 15:33:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Our physics team is investigating virtual simulation using CT and a beefy computer. Any comments on any system would be appreciated. From the users, physics or techos point of view. The particular issue is whether this can totally do away with a simulator or not. Thanks :) Dave ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cell phones. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Cell phones. Date: Sun, 22 Apr 2001 13:51:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, I've noticed a phrase 'When a clinician uses a cellphone' occuring in the recent discussions I would like to suggest that it's nastier than that because the cellphone regularly contacts the celltower IRRESPECTIVE of whether the person is using the phone. All it needs is for the cellphone to be on. Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Mobile phones-treatment areas Message-ID: <000e01c0c9fb$e5395d10$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: 'Tim Cullen' Cc: linac-eng@plato1.aristotle.net Subject: RE: Mobile phones-treatment areas Date: Fri, 20 Apr 2001 16:42:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, Peter and list members, I definitely agree that the possibility of interference from cell phone and other wireless devices should be closely examined and tested for all hospital equipment, including radiation equipment. At the same time, I would not recommend accepting the results from such testing by the manufacturers as definitive unless that testing is done to an industrywide, standardized protocol and procedure. Also, the results of testing done on monitoring devices cannot be directly applied to therapy radiation equipment. The interference mechanisms may be very different. Electromagnetic sensitivities are quite different between radiation-producing equipment (including the control subsystems) and equipment designed specifically to measure and monitor low-level signals. Think about this from the electronics perspective. The input stages of instruments measuring low-level physiological signals are designed with suitably sensitive circuitry. Similar comments apply to the portable electronic dose monitoring instruments referenced in Chris Gouin's posting and in Bruce Curry's posting. Those instruments must be sensitive to very low-level electronic signals generated by low levels of ionizing radiation. Different types of equipment simply should be tested with different, specifically appropriate tests. Peter's question about the susceptibility of brachytherapy equipment's console to cell phone interference cannot begin to be answered from the published article. If the sources of interference can be adequately characterized, both in frequency and field strengths, then these issues can be initially addressed in the design phase of the hospital equipment lifecycle. Adequate characterization of all the possible interference sources ain't easy. Beyond that, attempts to prevent interference in the design and construction may be difficult and/or expensive. Resources to address these concerns will have to be accurately targetted in order to get reliably safe results. All in all, this is a challenging and complex area of concern. It will not help to confuse or distort the issues nor the facts. And that was why I tried in my earlier posting, to clarify beyond Peter's imprecise linking of the Mayo clinic article with radiation therapy equipment. The article is relevant enough to raise attention, yes. Directly applicable to this kind of equipment, no. The article reported incidence of clinically significant interference was 7.4% of the equipment tested, which was restricted to certain types of patient monitoring equipment and one ventilator. The good scientists at Mayo did not claim more than this. Peter's comments did imply more. I do fully agree with you Peter that we have a ways to go to ensure the safety of patients, staff and others in this area. The equipment I am now working on is intended to become UL and CE certified. I don't yet know whether those standards fully address this issue. Does anyone else on the list know about that? Meanwhile, we all know it is good practice to do what we can to take a conservatively safe approach in the clinics. Living in a dangerous world, and glad that we are all genuinely concerned, John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Tim Cullen Sent: Friday, April 20, 2001 7:02 AM To: Caunt, Peter Cc: 'linac-eng@plato1.aristotle.net' Subject: Re: Mobile phones-treatment areas Peter and John, what I would like to see is all the manufacturers do the testing and then inform the public regarding the risk. It seems because there are documented effects on some equipment based on private and manufacturing studies, that all equipment gets thrown into the pot. This is still good policy though, based on a hospital setting, because of the fact that there is so much portable equipment being used. Which means that cell phone use may be harmless in radiation therapy until an in-patient arrives with a piece of portable life support equipment attached to their person, which may or may not be affected. Tim "Caunt, Peter" wrote: > John, > Thanks for adding your comments to the list. > > The Mayo Clinic article, in its first paragraph, sought to address the issue > of the relationship between the recent development of hospital policies on > the use of cellular phones within hospital environments and the basis of > these policies on objective experimental or clinical testing. > > Considering this article supported current understanding that electric > fields eminating from commercially available cellular phones can interfere > with the normal operation of medical equipment ("The incidence of clinically > important interference was 7.4%") the relevance of this to radiation > treatment equipment (I would have thought)would be logical. > > For instance, is the brachytherapy console immune to interference when a > clinician uses their phone in the control area during a treatment procedure? > > I think we still have a way to go on this one. > > Regards, > > Peter Caunt > Radiation Oncology > Canberra, Australia. > > >Peter, other list members, > > Here's what the article actually says: > > Title: Cellular Phone Interference with External Cardiopulmonary > Monitoring > >Devices > > > From the second page of the article: "The majority of the > interference > >occurred in devices that display ECGs. The only medical device that showed > >interference that does not display ECGs was the Veolar-Hamilton > ventilator." > > > In this article I see no statement about Radiotherapy treatment > systems, > >and nothing said about cell phone interference involving computer > controlled > >Radiotherapy treatment systems. Am I overlooking something? > > I'm not saying such interference can't happen, just that this article > >includes no evidence of it and wasn't testing for it. > > > There is an editorial in the same issue of the Mayo Clinic > Proceedings > >which mentions the possibility of being involved in auto accidents caused > by > >people trying to drive and talking on cell phones at the same time. This > may > >be a higher probability hazard than cell phone interference with radiation > >equipment. > > > Be careful folks, it's a dangerous world out there! > > > John Somers ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta SL 20 relays Message-ID: <3AE08B57.4A622D89@yale.edu> From: "Peter E. Vitali" To: Denny Yu Cc: linac-eng@plato1.aristotle.net, "'canadalist@egroups.com'" Subject: Re: Elekta SL 20 relays Date: Fri, 20 Apr 2001 11:19:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Denny: The relay is a Miniature power relay N made by Siemens. I found it in a 1983/84 data book. >From the Data Book: Miniature power relay N V23016-D....-A.9. for direct mounting into printed circuits with a solder pin for additional fixing. Pin arrangement for 2.5mm grid in accordance with DIN 40801 and DIN 40803, fine. Block 1 = Basic Type number Ex V23016- Block 2 = Coil number EX D0006 Block 3 = Contact arrangement EX A191 Std Types at that time was V23016-D0006-A191 0006 = 24Vdc nominal Min 16.8 and Max of 44 coil Resistance = 970+/- 144 A191 = Silver, gold-flashed contacts Single pole/ double throw. Max making /breaking power with dc voltages 55-420W (voltage dependent) D = Contact Version for type V23016-D..... digit 14 of ordering block 3 insert: 0 = for version with screw fixing 9 = for version with solder pin. Hope this Helps Peter E. Vitali, CBET Therapeutic Radiologic Engineer Yale New Haven Hospital 20 York Street, HRT 22 New Haven, CT. 06504 Phone: (203) 688-2948 FAX: (203) 688-3663 E-mail: peter.vitali@yale.edu As usual, everything I say may be plausibly denied at my employer's convenience... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Mobile phones-treatment areas Message-ID: From: Bruce Curran To: "'linac-eng@plato1.aristotle.net'" Subject: RE: Mobile phones-treatment areas Date: Fri, 20 Apr 2001 14:21:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A number of years ago I was doing a dose survey of a newly installed Clinac 6/100. My first survey meter gave abnormally high results on the initial in-room survey. After some testing and comparison with another survey meter, we determined that meter #1 was sensitive to the rf floating in the room due to the accelerator [to the tune of 4X - 10X higher readings]. Given that, not surprising that some of the personal dosemeters are also sensitive. Bruce Curran Vice-President, Technology curran@nomos.com NOMOS Corporation (724) 934-8263 2591 Wexford Bayne Road (724) 934-5488 [FAX] Sewickley, PA 15143 > ---------- > From: Gouin, Chris[SMTP:Chris_Gouin@hmis.org] > Sent: Friday, April 20, 2001 3:48 PM > To: 'linac-eng@plato1.aristotle.net' > Subject: RE: Mobile phones-treatment areas > > Greetings, > I did a quick search on Medline for cell phone related articles and found > this one. I haven't had a chance to get a copy of the article yet, so I > haven't evaluated its content. However, someone may have a copy of the > journal lying around (or know a physicist who has it). > > Br J Radiol 2000 Sep;73(873):994-8 > > GSM cell phones can interfere with ionizing radiation dose monitoring > equipment. > Gilligan P, Somerville S, Ennis JT. > Institute of Radiological Sciences/Mater Private Hospital/University > College Dublin, Ireland. > Cell phone use is growing worldwide. These phones transmit to adjacent > base stations using radiofrequency signals in the microwave range > (approximately 900-approximately 1800 MHz). Portable electronic dose > monitoring equipment is used in hospitals and other institutions to > monitor and control levels of exposure to ionizing radiation, and to > reassure staff. The objective of this paper is to investigate the effect > of mobile phones on a sample of dose monitoring devices. Two mobile phones > (Siemens C25 and Motorola CD930) were used in the study. Field strengths > were measured to be in the range 0 V m-1 to over 100 V m-1, depending on > the distance from the phone, and were strongest at the beginning of a > call. Personal electronic dosemeters (n = 7), portable dose monitors (n = > 4) and contamination monitors (n = 2) were assessed. All the units were in > service. Three of the personal dosemeters showed abnormal responses when > exposed to mobile phone transmission. One dosemeter (Siemens EPD-2) > registered doses equivalent to a dose rate of 99 mSv h-1. In addition, two > of the portable dosemeters and one of the contamination monitors also gave > an abnormal response. Interference was observed across a number of > detector types from a number of manufacturers. Modern cell phones can > interfere with ionizing radiation dose monitoring equipment. This should > be taken into account when distributing these devices and when assessing > results generated by them. Electromagnetic compatibility testing should > form part of the commissioning and specification protocol for new dose > monitoring equipment. > PMID: 11064654 > > Enjoy, > > Christopher A. Gouin, MS > Community Health Partners > Dept. of Radiation Oncology > 3700 Kolbe Rd. > Lorain, OH 44053 > Phone: 440-233-1044 > Fax: 440-245-1578 > > > > CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, > is for the sole use of the intended recipient(s) and may contain > confidential > and privileged information. Any unauthorized review, use, disclosure or > distribution is prohibited. If you are not the intended recipient, please > contact the sender by reply e-mail and destroy all copies of the original > message. > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PRF cal on 600c, release 3 Message-ID: <3AE0AC8E.A4777302@wfubmc.edu> From: tcullen@wfubmc.edu To: Jiri Bocanek Cc: "Linac (E-mail)" Subject: Re: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 13:39:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jiri, the varian release 3 SW did/does have a PRF determination period. What you say about ver 5 and 6 can be accomplished easier by just going to standby then doing the F2 Diags. and run MC after TDLY. Jiri Bocanek wrote: > Hi John, > > if you speak about Varian's Clinac 600C there is no PRF calibration cycle > for software version 3.2,3.4 and I do not know about 3.5 - but would guess > the same. > > On version 5 and 6: To initiate PRF calibration sequence go to service mode > ( from Main screen ), turn power key to Stand By, leave Service mode ( let > machine to complete self test ). Upon completition of self test turn key > back to ON and go to Morning checkout mode and choose fixed field technique. > After Time Delay machine will perform PRF calibration. > > Jiri Bocanek > National Cancer Institute > Bratislava, Slovakia > > ----- Original Message ----- > From: "Ukos, John" > To: "Linac (E-mail)" > Sent: Wednesday, April 18, 2001 23:31 > Subject: PRF cal on 600c, release 3 > > > This should be an easy one..how do I initiate PRF calibration. I have > seen > > the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but > it > > occured more by accident than intentionally. I have tried shutting down > the > > machine to E-OFF state and making sure there is no power to the console > > (plug on the Patch Panel). I also tried pressing the white reset button > on > > the STD terminator PCB. > > > > John Ukos > > Senior Electronics Technologist > > Hamilton Regional Cancer Centre > > Hamilton Ontario Canada > > (905) 387 9495 > > john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Mobile phones-treatment areas Message-ID: <3579F04D3B99D4119D2200805FC1CFE56F0F56@S02MEXCH2> From: "Gouin, Chris" To: "'linac-eng@plato1.aristotle.net'" Subject: RE: Mobile phones-treatment areas Date: Fri, 20 Apr 2001 11:48:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, I did a quick search on Medline for cell phone related articles and found this one. I haven't had a chance to get a copy of the article yet, so I haven't evaluated its content. However, someone may have a copy of the journal lying around (or know a physicist who has it). Br J Radiol 2000 Sep;73(873):994-8 GSM cell phones can interfere with ionizing radiation dose monitoring equipment. Gilligan P, Somerville S, Ennis JT. Institute of Radiological Sciences/Mater Private Hospital/University College Dublin, Ireland. Cell phone use is growing worldwide. These phones transmit to adjacent base stations using radiofrequency signals in the microwave range (approximately 900-approximately 1800 MHz). Portable electronic dose monitoring equipment is used in hospitals and other institutions to monitor and control levels of exposure to ionizing radiation, and to reassure staff. The objective of this paper is to investigate the effect of mobile phones on a sample of dose monitoring devices. Two mobile phones (Siemens C25 and Motorola CD930) were used in the study. Field strengths were measured to be in the range 0 V m-1 to over 100 V m-1, depending on the distance from the phone, and were strongest at the beginning of a call. Personal electronic dosemeters (n = 7), portable dose monitors (n = 4) and contamination monitors (n = 2) were assessed. All the units were in service. Three of the personal dosemeters showed abnormal responses when exposed to mobile phone transmission. One dosemeter (Siemens EPD-2) registered doses equivalent to a dose rate of 99 mSv h-1. In addition, two of the portable dosemeters and one of the contamination monitors also gave an abnormal response. Interference was observed across a number of detector types from a number of manufacturers. Modern cell phones can interfere with ionizing radiation dose monitoring equipment. This should be taken into account when distributing these devices and when assessing results generated by them. Electromagnetic compatibility testing should form part of the commissioning and specification protocol for new dose monitoring equipment. PMID: 11064654 Enjoy, Christopher A. Gouin, MS Community Health Partners Dept. of Radiation Oncology 3700 Kolbe Rd. Lorain, OH 44053 Phone: 440-233-1044 Fax: 440-245-1578 CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta SL 20 relays Message-ID: <6BAF4D075F07D411B30900508B94CBA01C1487@SERVER20> From: Denny Yu To: linac-eng@plato1.aristotle.net Cc: "'canadalist@egroups.com'" Subject: Elekta SL 20 relays Date: Fri, 20 Apr 2001 08:57:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For those who work on the Elekta Linacs, please advise if anyone has any luck in second source the Relays used in all the ROC cards. Those relays are 24 volts, SPDT, on the clear plastic casing, the #s are V23016 D0006-A191, cannot identify the manufacturer. Gone through a few electronics vendors catalogues, no luck...... Thanks. Regards, Denny Yu Fraser Valley Cancer Centre SVC Tech 604-930-4051 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PRF cal on 600c, release 3 Message-ID: <002901c0c9b9$00561c70$0901a8c0@C800JB> From: Jiri Bocanek To: "Ukos, John" , "Linac (E-mail)" Subject: Re: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 08:43:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi John, if you speak about Varian's Clinac 600C there is no PRF calibration cycle for software version 3.2,3.4 and I do not know about 3.5 - but would guess the same. On version 5 and 6: To initiate PRF calibration sequence go to service mode ( from Main screen ), turn power key to Stand By, leave Service mode ( let machine to complete self test ). Upon completition of self test turn key back to ON and go to Morning checkout mode and choose fixed field technique. After Time Delay machine will perform PRF calibration. Jiri Bocanek National Cancer Institute Bratislava, Slovakia ----- Original Message ----- From: "Ukos, John" To: "Linac (E-mail)" Sent: Wednesday, April 18, 2001 23:31 Subject: PRF cal on 600c, release 3 > This should be an easy one..how do I initiate PRF calibration. I have seen > the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but it > occured more by accident than intentionally. I have tried shutting down the > machine to E-OFF state and making sure there is no power to the console > (plug on the Patch Panel). I also tried pressing the white reset button on > the STD terminator PCB. > > John Ukos > Senior Electronics Technologist > Hamilton Regional Cancer Centre > Hamilton Ontario Canada > (905) 387 9495 > john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Stabilipan Message-ID: <86256A34.00571C22.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: tcullen@wfubmc.edu Cc: Richard Kimball , Linac Listserv Subject: Re: Siemens Stabilipan Date: Fri, 20 Apr 2001 07:49:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We've had some success putting acrylic ends on the Philips applicators. But it does change the scatter characteristics of the cone quite a bit, enough to require physics re-commission. TimW tcullen@wfubmc.edu (Tim Cullen) on 04/20/2001 09:17:03 AM To: Richard Kimball cc: Linac Listserv (bcc: Timothy J. Waldron/MDACC) Subject: Re: Siemens Stabilipan Richard, just a suggestion. If you have a machinist close by, they could possibly mill you one from another material and press the tube into it. Richard Kimball wrote: > Would there be any chance that someone somewhere has or would know where to > get a 2cm and 3cm cylindrical cone for the above orthovoltage unit? Both of > these have been dropped and have had the glass (quartz) bottom portion > broken. > > Thanks much. > > Rich Kimball > Acceletronics, Inc. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: vacancy + beam symmetry at start up question Message-ID: <007901c0c9ac$fa2c77b0$7b2d42c2@OliverHaas> From: Olivier Haas To: medphys , "Linac (E-mail)" Subject: vacancy + beam symmetry at start up question Date: Fri, 20 Apr 2001 07:17:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear all, has someone assessed the effect of the changes in the beam symmetry at = start up for small beam fraction. It is observed that on some machine (here I would not mention any manufacturer), the beam symmetry is only achieved after 'some' time, = which varies depending on the machine tuning and age. I was wondering if = anyone has assessed the effect of this on a treatment plan specified assuming = a particular in-air-profile. With respect to IMRT one would wonder if the beam characteristics = obtained during the daily A or ideally during the fraction delivered should not = be fed back to the optimisation algorithm to correct for changes in the = beam characteristics. Similar to using portal imaging to assess the dose = actually delivered... Then again one may wonder if the beam symmetry change is a negligible = factor compared to other more significant one (e.g. breathing) thanks in advance for any comments Olivier PS: look at our current vacancies page if you are a good programmer interested in doing some work on robotic 3D vision. The post is for 2 = years, based in Coventry UK, teaching company associate =A318,000 - =A325,000 Olivier Haas, PhD Coordinator Biomedical Engineering Systems Group Control Theory and Applications Centre Coventry University, Priory Street, Coventry CV15FB Tel +44 (0)247688972 Fax +44(0)2476888052 http://www.ctac.mis.coventry.ac.uk/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PRF cal on 600c, release 3 Message-ID: <85256A34.004E9EB4.00@mail.lrcc.on.ca> From: Bob.Tonks@lrcc.on.ca To: "Ukos, John" , linac-eng@plato1.aristotle.net Subject: Re: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 06:18:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" On our unit which is older software a prf calibration is performed after a diagnostics is done. Hope this helps, Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Stabilipan Message-ID: <3AE044DF.64E63116@wfubmc.edu> From: tcullen@wfubmc.edu To: Richard Kimball Cc: Linac Listserv Subject: Re: Siemens Stabilipan Date: Fri, 20 Apr 2001 06:17:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, just a suggestion. If you have a machinist close by, they could possibly mill you one from another material and press the tube into it. Richard Kimball wrote: > Would there be any chance that someone somewhere has or would know where to > get a 2cm and 3cm cylindrical cone for the above orthovoltage unit? Both of > these have been dropped and have had the glass (quartz) bottom portion > broken. > > Thanks much. > > Rich Kimball > Acceletronics, Inc. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Mobile phones-treatment areas Message-ID: <3AE04141.4D37D81E@wfubmc.edu> From: tcullen@wfubmc.edu To: "Caunt, Peter" Cc: "'linac-eng@plato1.aristotle.net'" Subject: Re: Mobile phones-treatment areas Date: Fri, 20 Apr 2001 06:01:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter and John, what I would like to see is all the manufacturers do the testing and then inform the public regarding the risk. It seems because there are documented effects on some equipment based on private and manufacturing studies, that all equipment gets thrown into the pot. This is still good policy though, based on a hospital setting, because of the fact that there is so much portable equipment being used. Which means that cell phone use may be harmless in radiation therapy until an in-patient arrives with a piece of portable life support equipment attached to their person, which may or may not be affected. Tim "Caunt, Peter" wrote: > John, > Thanks for adding your comments to the list. > > The Mayo Clinic article, in its first paragraph, sought to address the issue > of the relationship between the recent development of hospital policies on > the use of cellular phones within hospital environments and the basis of > these policies on objective experimental or clinical testing. > > Considering this article supported current understanding that electric > fields eminating from commercially available cellular phones can interfere > with the normal operation of medical equipment ("The incidence of clinically > important interference was 7.4%") the relevance of this to radiation > treatment equipment (I would have thought)would be logical. > > For instance, is the brachytherapy console immune to interference when a > clinician uses their phone in the control area during a treatment procedure? > > I think we still have a way to go on this one. > > Regards, > > Peter Caunt > Radiation Oncology > Canberra, Australia. > > >Peter, other list members, > > Here's what the article actually says: > > Title: Cellular Phone Interference with External Cardiopulmonary > Monitoring > >Devices > > > From the second page of the article: "The majority of the > interference > >occurred in devices that display ECGs. The only medical device that showed > >interference that does not display ECGs was the Veolar-Hamilton > ventilator." > > > In this article I see no statement about Radiotherapy treatment > systems, > >and nothing said about cell phone interference involving computer > controlled > >Radiotherapy treatment systems. Am I overlooking something? > > I'm not saying such interference can't happen, just that this article > >includes no evidence of it and wasn't testing for it. > > > There is an editorial in the same issue of the Mayo Clinic > Proceedings > >which mentions the possibility of being involved in auto accidents caused > by > >people trying to drive and talking on cell phones at the same time. This > may > >be a higher probability hazard than cell phone interference with radiation > >equipment. > > > Be careful folks, it's a dangerous world out there! > > > John Somers ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PRF cal on 600c, release 3 Message-ID: <000801c0c9a1$382c7850$468cd781@lomond2.onc.ed.ac.uk> From: Hamish Porter To: "Kloster, Stephen" , "Linac (E-mail)" Subject: Re: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 05:52:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It is the first beam in the morning checkout mode that does this. It is not date dependant so you can run checkout more than once in the day. >From : Hamish Porter Oncology Physics Department Directorate of Clinical Oncology Western General Hospital Edinburgh EH4 2XU 0131-537-2254 0131-537-1092 hporter@holyrood.ed.ac.uk -----Original Message----- From: Kloster, Stephen To: Linac (E-mail) Date: 20 April 2001 14:09 Subject: RE: PRF cal on 600c, release 3 >Hi John, >I am not 100% sure, but I believe that the calibration is only performed on >the first beam run on a given date. >Regards, >Steve Kloster >Kingston RCC > >-----Original Message----- >From: Ukos, John [mailto:John.Ukos@hrcc.on.ca] >Sent: Wednesday, April 18, 2001 5:31 PM >To: Linac (E-mail) >Subject: PRF cal on 600c, release 3 > > >This should be an easy one..how do I initiate PRF calibration. I have seen >the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but it >occured more by accident than intentionally. I have tried shutting down the >machine to E-OFF state and making sure there is no power to the console >(plug on the Patch Panel). I also tried pressing the white reset button on >the STD terminator PCB. > >John Ukos >Senior Electronics Technologist >Hamilton Regional Cancer Centre >Hamilton Ontario Canada >(905) 387 9495 >john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron time-out interlocks Message-ID: <3AE03CEA.AF02CD5@wfubmc.edu> From: tcullen@wfubmc.edu To: "kimyeung@ultraline" Cc: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Ximatron time-out interlocks Date: Fri, 20 Apr 2001 05:43:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kim, it could be a problem on the dynamic braking pcb, the joysticks or pendant TWs or maybe even SW related. I would check both the joysticks and the TWs on the pendants to make sure they are centered and the MEBs are good before worrying about anything else. The 4 channel comms pcb in the PC could also be the problem or anything in between it and the console and pendants. "kimyeung@ultraline" wrote: > Hi Colleagues, > > Could someone please advise the causes of the following interlocks > occurred in Ximatron? > 1. Console joystick time-out > 2. Console device time-out > 3. Pendant device time-out > 4. Pendant thumbwheel time-out > > Thanks in advance. > > Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: PRF cal on 600c, release 3 Message-ID: <3AE03BDD.8097CA84@wfubmc.edu> From: tcullen@wfubmc.edu To: "Kloster, Stephen" Cc: "Linac (E-mail)" Subject: Re: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 05:38:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" John, when the unit is powered up or restarted, the system timers and the frequency should re-initialize. Then the PRF is supposed to be determined during the first 900 beam pulses of a non dynamic treatment. I would think coming out of an EO state would do it and coming out of standby to on, maybe. I always thought that if you ran F2 Diags in standby, the auto PRF determination would occur afterwards. "Kloster, Stephen" wrote: > Hi John, > I am not 100% sure, but I believe that the calibration is only performed on > the first beam run on a given date. > Regards, > Steve Kloster > Kingston RCC > > -----Original Message----- > From: Ukos, John [mailto:John.Ukos@hrcc.on.ca] > Sent: Wednesday, April 18, 2001 5:31 PM > To: Linac (E-mail) > Subject: PRF cal on 600c, release 3 > > This should be an easy one..how do I initiate PRF calibration. I have seen > the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but it > occured more by accident than intentionally. I have tried shutting down the > machine to E-OFF state and making sure there is no power to the console > (plug on the Patch Panel). I also tried pressing the white reset button on > the STD terminator PCB. > > John Ukos > Senior Electronics Technologist > Hamilton Regional Cancer Centre > Hamilton Ontario Canada > (905) 387 9495 > john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: PRF cal on 600c, release 3 Message-ID: <03C51291F117D5119BA70002A528B3F004B881@KRCCMAIL.krcc_nt> From: "Kloster, Stephen" To: "Linac (E-mail)" Subject: RE: PRF cal on 600c, release 3 Date: Fri, 20 Apr 2001 04:14:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi John, I am not 100% sure, but I believe that the calibration is only performed on the first beam run on a given date. Regards, Steve Kloster Kingston RCC -----Original Message----- From: Ukos, John [mailto:John.Ukos@hrcc.on.ca] Sent: Wednesday, April 18, 2001 5:31 PM To: Linac (E-mail) Subject: PRF cal on 600c, release 3 This should be an easy one..how do I initiate PRF calibration. I have seen the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but it occured more by accident than intentionally. I have tried shutting down the machine to E-OFF state and making sure there is no power to the console (plug on the Patch Panel). I also tried pressing the white reset button on the STD terminator PCB. John Ukos Senior Electronics Technologist Hamilton Regional Cancer Centre Hamilton Ontario Canada (905) 387 9495 john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Room door interlocks Message-ID: <2cf5cf11e097a42b1af2fb92071f8faa3ae00816@mkoc.demon.co.uk> From: David Fenn To: "'Twyman, Paul'" , 'LINAC-ENG' Subject: RE: Room door interlocks Date: Fri, 20 Apr 2001 01:32:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Paul! Try RS type 178-181 with actuator 193-0479. Total price under =A310! David Fenn Kent Oncology Centre -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Twyman, Paul Sent: 05 April 2001 17:08 To: 'LINAC-ENG' Subject: Room door interlocks Hello fellow hard working linac engineers. I wonder if anyone can offer some advice on an issue of door interlock switches for treatment room doors. We are currently building 2 new accelerator bunkers here at = Addenbrookes hospital and I need to source some appropriate door interlock switches. On our existing treatment room doors we have the Burgess BSM 360 lever arm positive action type switches. These are the grey box type with the lever arm that can be adjusted for length and rotational position. The manufacturer, Burgess, no longer supplies these and cannot offer an alternative. What are other people using and where can I get them from? Thank you in advance, Paul Twyman ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Ximatron time-out interlocks Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: kimyeung@netvigator.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Ximatron time-out interlocks Date: Thu, 19 Apr 2001 21:49:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Magic, Kim Just black magic. Keesjan. > -----Original Message----- > From: kimyeung@ultraline [SMTP:kimyeung@netvigator.com] > Sent: Thursday, April 19, 2001 3:14 PM > To: ''Linac-Eng@plato1.aristotle.net' ' > Subject: Re: Ximatron time-out interlocks > > Hi Colleagues, > > Could someone please advise the causes of the following interlocks > occurred in Ximatron? > 1. Console joystick time-out > 2. Console device time-out > 3. Pendant device time-out > 4. Pendant thumbwheel time-out > > Thanks in advance. > > Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mobile phones-treatment areas Message-ID: <000951210631D311B91A00A0C9DED0B867ACF4@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Mobile phones-treatment areas Date: Thu, 19 Apr 2001 20:19:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" John, Thanks for adding your comments to the list. The Mayo Clinic article, in its first paragraph, sought to address the issue of the relationship between the recent development of hospital policies on the use of cellular phones within hospital environments and the basis of these policies on objective experimental or clinical testing. Considering this article supported current understanding that electric fields eminating from commercially available cellular phones can interfere with the normal operation of medical equipment ("The incidence of clinically important interference was 7.4%") the relevance of this to radiation treatment equipment (I would have thought)would be logical. For instance, is the brachytherapy console immune to interference when a clinician uses their phone in the control area during a treatment procedure? I think we still have a way to go on this one. Regards, Peter Caunt Radiation Oncology Canberra, Australia. >Peter, other list members, > Here's what the article actually says: > Title: Cellular Phone Interference with External Cardiopulmonary Monitoring >Devices > From the second page of the article: "The majority of the interference >occurred in devices that display ECGs. The only medical device that showed >interference that does not display ECGs was the Veolar-Hamilton ventilator." > In this article I see no statement about Radiotherapy treatment systems, >and nothing said about cell phone interference involving computer controlled >Radiotherapy treatment systems. Am I overlooking something? > I'm not saying such interference can't happen, just that this article >includes no evidence of it and wasn't testing for it. > There is an editorial in the same issue of the Mayo Clinic Proceedings >which mentions the possibility of being involved in auto accidents caused by >people trying to drive and talking on cell phones at the same time. This may >be a higher probability hazard than cell phone interference with radiation >equipment. > Be careful folks, it's a dangerous world out there! > John Somers ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Mobile Phones in treatment areas-Thanks. Message-ID: <000401c0c940$07b70a20$120009c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: "'Caunt, Peter'" , linac-eng@plato1.aristotle.net Subject: RE: Mobile Phones in treatment areas-Thanks. Date: Thu, 19 Apr 2001 18:17:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, other list members, Here's what the article actually says: Title: Cellular Phone Interference with External Cardiopulmonary Monitoring Devices From the second page of the article: "The majority of the interference occurred in devices that display ECGs. The only medical device that showed interference that does not display ECGs was the Veolar-Hamilton ventilator." In this article I see no statement about Radiotherapy treatment systems, and nothing said about cell phone interference involving computer controlled Radiotherapy treatment systems. Am I overlooking something? I'm not saying such interference can't happen, just that this article includes no evidence of it and wasn't testing for it. There is an editorial in the same issue of the Mayo Clinic Proceedings which mentions the possibility of being involved in auto accidents caused by people trying to drive and talking on cell phones at the same time. This may be a higher probability hazard than cell phone interference with radiation equipment. Be careful folks, it's a dangerous world out there! John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Caunt, Peter Sent: Monday, April 16, 2001 6:08 PM To: 'linac-eng@plato1.aristotle.net' Subject: Mobile Phones in treatment areas-Thanks. Thanks to all the respondants on this issue. The article referred to : "Mayo Clinic Proc.2001;76:11-15" Can be found -> www.mayo.edu/proceedings/2001/jan/jan2001.html Clinically important cell phone interference involving computer controlled Radiotherapy treatment systems - hmmm... interesting. Thanks again, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Linac Engineers annual meeting Message-ID: <86256A33.0083C1FE.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: "Urmanita, Ted" Cc: "'linac-eng@plato.aristotle.net'" Subject: Re: Linac Engineers annual meeting Date: Thu, 19 Apr 2001 15:57:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The meeting last year was arranged and roughly 50% funded by the AAPM. We did not get it together in time to have one this year, at least not in the official sense. With luck we will be able to do something in 2002. Tim Waldron ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Linear Accelerator Message-ID: <86256A33.00824484.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: "Peter E. Vitali" Cc: "Medical Physics, Listserver" , "Linac-Engineers, Listserver" Subject: Re: Linear Accelerator Date: Thu, 19 Apr 2001 15:41:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, I cannot address Mitsubishi or Philipas linacs, but both Varian and Siemens use a mirror approach. Of course the "GE" Saturne machines I've worked with are basically CGR designs, so they have the field light mounted on the target slide, just like the Sagittaire and Therac machines. TimW ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: PRF cal on 600c, release 3 Message-ID: <9C688FB52A05D51194750002B325B5F7340EC9@hrccex.hrcc.on.ca> From: "Ukos, John" To: "Linac (E-mail)" Subject: PRF cal on 600c, release 3 Date: Wed, 18 Apr 2001 13:31:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This should be an easy one..how do I initiate PRF calibration. I have seen the calibration run (machine runs at 50 mu/min for a 100 mu's or so) but it occured more by accident than intentionally. I have tried shutting down the machine to E-OFF state and making sure there is no power to the console (plug on the Patch Panel). I also tried pressing the white reset button on the STD terminator PCB. John Ukos Senior Electronics Technologist Hamilton Regional Cancer Centre Hamilton Ontario Canada (905) 387 9495 john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mobile Phones in treatment areas-Thanks. Message-ID: <000951210631D311B91A00A0C9DED0B867ACEE@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Mobile Phones in treatment areas-Thanks. Date: Mon, 16 Apr 2001 17:08:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all the respondants on this issue. The article referred to : "Mayo Clinic Proc.2001;76:11-15" Can be found -> www.mayo.edu/proceedings/2001/jan/jan2001.html Clinically important cell phone interference involving computer controlled Radiotherapy treatment systems - hmmm... interesting. Thanks again, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: (no subject) Message-ID: <90.1353634b.2810c699@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: (no subject) Date: Thu, 19 Apr 2001 14:54:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Fellow Linacsters, For anyone interested, we have a 16 year old Varian 6/100 Ser #203 ready to go out the door. The catch is this, it needs to be removed by the 28th of April 2001. If you need more info, reply to me by e-mail or call 908-238-1231. The price is you take and it's yours. Barry Michael St. Barnabas Medical Center I have tried sending this message several times but it kept coming back undeliverable. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Stabilipan Message-ID: <001301c0c766$dc318b80$0100a8c0@mshome.net> From: Richard Kimball To: Linac Listserv Subject: Siemens Stabilipan Date: Tue, 17 Apr 2001 09:50:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Would there be any chance that someone somewhere has or would know where to get a 2cm and 3cm cylindrical cone for the above orthovoltage unit? Both of these have been dropped and have had the glass (quartz) bottom portion broken. Thanks much. Rich Kimball Acceletronics, Inc. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Linear Accelerator Message-ID: <3ADDB3B1.632DFC16@yale.edu> From: "Peter E. Vitali" To: "Medical Physics, Listserver" , "Linac-Engineers, Listserver" Subject: Linear Accelerator Date: Wed, 18 Apr 2001 07:33:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning all: I am looking for information on the construction of the head and collimators on various linear accelerators. Years ago we had a CGR Sagittaire that had a unique configuration of the head and collimator. Unlike the Varian machines of today, which uses a mirror system, the light field was produce by moving the field light bulb into the target's position, and moving the filters and chamber out of the way. This left no obstructions in the beam path. Are there any machines out in the field in use, old or new, that still use this configuration? Thank You Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Linac Engineers annual meeting Message-ID: From: "Urmanita, Ted" To: "'linac-eng@plato.aristotle.net'" Subject: Linac Engineers annual meeting Date: Wed, 18 Apr 2001 06:32:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello folks, AAPM is just around the corner, July 22 through 26 in Salt Lake City, Utah. What is the agenda for this year's linac meeting? Is there going to be one? If someone could share infos regarding fees, continuing education , linac enginineering group organization, general information, etc. Thanks and best regards. Ted Urmanita Radonc UCLA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron time-out interlocks Message-ID: <3ADEE4A9.1A9173AA@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Ximatron time-out interlocks Date: Thu, 19 Apr 2001 05:14:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could someone please advise the causes of the following interlocks occurred in Ximatron? 1. Console joystick time-out 2. Console device time-out 3. Pendant device time-out 4. Pendant thumbwheel time-out Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: From: "Bush, Thomas M." To: "'Linac-eng@plato1.aristotle.net'" Subject: Date: Thu, 12 Apr 2001 08:26:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are making a few changes to our treatment planning equipment around here and therefore have the following for sale. If anyone is interested please let me know and I'll have my people talk to your people. One "Render" treatment planning system including 3 each Uniax based Silicon Graphics workstations (one Indy, one file server and 2 Indigo) with digitizer and plotter. One Picker "Voxel-Q" terminal complete with recent memory and hard drive upgrades. Includes really cool monitor! Everything works perfectly.... Just no longer needed as we are switching to Adac Planning. Get 'em while their HOT.!! Tom Bush Sacred Heart Medical Center Spokane, Washington ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron timeout interlocks Message-ID: <3AD5B29E.A7F6CA0C@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Ximatron timeout interlocks Date: Thu, 12 Apr 2001 05:50:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could someone please advise the causes of the following interlocks occurred in Ximatron? 1. Console joystick time-out 2. Console device time-out 3. Pendant device time-out 4. Pendant thumbwheel time-out Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Mobile phones in Treatment Areas Message-ID: <39.133c4a7a.28061d38@aol.com> From: Radsrus@aol.com To: Peter.Caunt@act.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Mobile phones in Treatment Areas Date: Wed, 11 Apr 2001 12:48:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" excerpt from: http://www.fda.gov/cdrh/ost/emi.html ELECTROMAGNETIC INTERFERENCE (EMI) TESTING OF MEDICAL DEVICES FDA/AAMI Forum on Medical Device Electromagnetic Compatibility (EMC) To promote awareness of the potential for problems stemming from electromagnetic interference (EMI) and cooperation toward solutions, CDRH and AAMI co-sponsored a 2-day forum entitled, "Electromagnetic Compatibility for Medical Devices." The forum was planned and initiated by the CDRH EMC Working Group, which was formed by the Deputy Director for Science for CDRH and charged with assessing medical devices EMI and coordinating CDRH solutions. The forum was conducted this past May in Anaheim, California, in conjunction with the annual AAMI conference. The goal of the forum was to present the concerns of CDRH about medical device EMC and strategies being developed to address these concerns. The concerns for device EMI have been heightened in recent years because of the increased use of sensitive electronics in many devices, and several reports of device malfunctions relating to EMI. This comes at a time when there is a dramatic increase in the number of portable radio transmitters, from cell phones to the "wireless" computer communications. OST representatives moderated the presentations by representatives from the medical device industries, the electromagnetic source (e.g., radio, cellular telephone, AC power) industries, clinical device users (clinicians and biomedical engineers), the legal profession, and the Federal Communications Commission..... EMC Testing of Implantable Cardiac Pacemakers for EMI from Digital Cellular Telephones Testing has been performed on 24 different implantable cardiac pacemakers for EMI from digital cellular telephones. This work was done in response to public health concerns based upon information that digital cellular phones could interfere with the normal operation of pacemakers. Laboratory results indicate that about eight of the devices tested reacted to a digital cell phone (i.e., U.S. TDMA digital, GSM digital, or MIRS digital). Most reactions were only with the MIRS cellular phone technology. All but one device ceased reacting to the cell phone when the phone was vertically beyond about 9 cm from the pacemaker submerged in saline. This distance is much less than the 15.24 cm (6 inches) recommended in the draft HIMA labeling for implanted cardiac pacemakers. However, one device continued to react even when the cell phone was at a distance of more than 36 cm. The test results also indicate that there are several devices in which EMI could not be induced. Further testing is needed to assess the validity of our findings on a wider range and number of pacemaker devices...... ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cell phones Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Cell phones Date: Wed, 11 Apr 2001 12:26:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, I remember an in-service-edu session I attended at our institution where the head of our technical services dept went over the issue carefully. He is part of the national standards body governing these type of issues. 1/ Cell phones vs mobile radio. Mobile radios only transmit when the press-to-talk button is depressed and the power is well defined. Cell phones however regularly try to locate a tower and join a cell. They do this all the time they are turned on. If they cannot locate a tower they increase their transmit power and try again. 2/ Infusion pumps seemed to be the most susceptable to these problems. There had been several that had mysteriously lost their programming entransit from dept to dept. Lab tests had reproduced the situation. 3/ There was a story (unverified) where a police car was on patrol on a pier in a US city. There were lots of persons fishing. One was in a wheelchair. Suddenly the wheelchair rocketed forward and deposited it's passenger over among the fishes. It appears the police radio had 'broken-in' on the electronics of the wheelchair drive motors.................. I personally do not feel comfortable with the idea of a powerful device transmitting right next door to my linacs just in case they influence the very sensitive dosimetry ccts or the uP ccts or the PC based stuff. Our hospital policy on cellphones is Public : They are to be turned off on entry to the hospital property. Staff : They are to be turned off in all clinical areas including corridors. Sorry if this is overly verbose and heavily endowed with perspicatious cogitations. :D ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Mobile phones in Treatment Areas Message-ID: <002c01c0c2aa$fcbdcd20$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "Linac-Eng (E-mail)" Subject: RE: Mobile phones in Treatment Areas Date: Wed, 11 Apr 2001 09:15:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One of my customers, a state teaching hospital with all levels of care, has an unrestricted cell phone policy except where individually posted and I've never noted a posted area anywhere in the hospital. In fact many on the staff are specifically issued cordless phones for use only at the institution. Marty Shapiro ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Mobile phones in Treatment Areas Message-ID: From: Radsrus@aol.com To: Ian.Beange@raigmore.scot.nhs.uk, Peter.Caunt@act.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Mobile phones in Treatment Areas Date: Wed, 11 Apr 2001 09:00:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, you can check out the site www.electric-words.com for more info on cell phone hazards. Interesting site. I've read that interference with wireless patient monitoring devices was the main reasoning for not allowing their use in hospitals. Quite a few standalone Radiotherapy centers do not restrict cell phone use because they do not have wireless devices, yet. Doesn't do much good though - don't get too many calls or pages in a "bunker". My Regards, Steve Schwarz In a message dated 04/11/2001 3:21:54 AM Central Daylight Time, Ian.Beange@raigmore.scot.nhs.uk writes: Subj:Re: Mobile phones in Treatment Areas Date:04/11/2001 3:21:54 AM Central Daylight Time From: Ian.Beange@raigmore.scot.nhs.uk (IAN BEANGE) Sender: owner-linac-eng@plato1.aristotle.net To: Peter.Caunt@act.gov.au, linac-eng@plato1.aristotle.net What journal are you referencing please ? Ian Beange Raigmore Hospital Inverness, Scotland >>> "Caunt, Peter" 11 April 2001 >>> Good morning all, Sorry to raise this one again, but since the Mayo Clinic article (2001:76:11-15), "Cellular Phone Interference" I am wondering how Radiotherapy centres are dealing with the issue. ... Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: test message only Message-ID: <3AD44198.1518.A04A979@localhost> From: Thomas McCausland Reply-To: acceltek@flash.net To: linac-eng@plato1.aristotle.net Subject: test message only Date: Wed, 11 Apr 2001 08:35:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" test Thomas W. McCausland AccelTek Inc. http://www.acceltekservice.com 281-652-0059 888-619-8811 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cat v Butter Message-ID: From: Robert Lindeyer To: linac-eng@plato1.aristotle.net Subject: Cat v Butter Date: Wed, 11 Apr 2001 08:04:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" When I mentioned the quandary about the Heisenberg Cat Principle to one of our Physicists he responded with the following message. I thought I would share it all of you Without any other vectors operating the cat-buttered bread system cannot land. However if for any reason the system becomes destabilized the buttered bread vector will seek the ground while equal gravity vectors operate on the cats feet and the cat is either torn in half or flies apart while revolving at an accelerating rate. Do not try this at home. Remember F=ma, where F is Fly-apart, m= meow and a= aggravation. Robert Lindeyer Clinical Engineer Radiation Oncology Hartford Hospital ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/x-vcard; name="Robert Lindeyer.vcf" Content-Disposition: attachment; filename="Robert Lindeyer.vcf" BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Lindeyer, Robert TEL;WORK:545-4346 ORG:;Medical Physics TEL;PREF;FAX:545-1500 EMAIL;WORK;PREF;NGW:Rlindey N:Lindeyer;Robert TITLE:Engineer X-GWUSERID:Rlindey END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Mobile phones in Treatment Areas Message-ID: <86256A2B.00541819.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: "Caunt, Peter" Cc: "'linac-eng@plato.aristotle.net'" Subject: Re: Mobile phones in Treatment Areas Date: Wed, 11 Apr 2001 07:17:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Here at MDACC, cellular phone use is banned in most areas of the hospital. Large signs are posted at all entrances. Tim Waldron ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: pcb alignment Message-ID: From: Joseph Czarnecki To: Garryangel@aol.com Cc: linac-eng@plato1.aristotle.net Subject: pcb alignment Date: Wed, 11 Apr 2001 07:35:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Garry, The information I have states R1 CCW to shorten decel time, R2 CCW to shorten accel time, R3 adjust (in run or high mode) for approx 10 msec period when viewing the M5 signal referenced to chassis gnd, dc coupling mode on scope, and R4 adjust approx 3 to 4 pulses/sec. Hope this helps. I got this information from drawing 885548, titled schmatic, carrousel power supply. Joseph M. Czarnecki Radiology & Imaging System Specialist III BJC Health Systems Clinical Engineering St. Louis, Missouri 63110 USA Work Telephone: 314.454.7101 email: joecz99@netzero.net jxc5307@bjc.org ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; name="Joseph Czarnecki.vcf" Content-Disposition: attachment; filename="Joseph Czarnecki.vcf" BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Joseph Czarnecki TEL;WORK:454-7101 ORG:;Clinical Engineering TEL;PREF;FAX:747-4617 EMAIL;WORK;PREF;NGW:jxc5307@bjc.org N:Czarnecki;Joseph TITLE:RissII X-GWUSERID:jxc5307 END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Slang Message-ID: <001c01c0c266$999f98c0$1ba199d1@thunderbird> From: Jeff Cressman To: Linac-Eng@plato1.aristotle.net Subject: Slang Date: Wed, 11 Apr 2001 01:05:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Here is a term that seems to be used only in the medical service fields ..... for obvious reasons. When your left to finish a repair some one else started, it is said you've been handed an "abortion" . Jeff Cressman ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Mobile phones in Treatment Areas Message-ID: From: IAN BEANGE To: Peter.Caunt@act.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Mobile phones in Treatment Areas Date: Wed, 11 Apr 2001 00:08:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What journal are you referencing please ? Ian Beange Raigmore Hospital Inverness, Scotland >>> "Caunt, Peter" 11 April 2001 >>> Good morning all, Sorry to raise this one again, but since the Mayo Clinic article (2001:76:11-15), "Cellular Phone Interference" I am wondering how Radiotherapy centres are dealing with the issue. ... Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mobile phones in Treatment Areas Message-ID: <000951210631D311B91A00A0C9DED0B867ACED@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato.aristotle.net'" Subject: Mobile phones in Treatment Areas Date: Tue, 10 Apr 2001 15:43:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning all, Sorry to raise this one again, but since the Mayo Clinic article (2001:76:11-15), "Cellular Phone Interference" I am wondering how Radiotherapy centres are dealing with the issue. Is cell phone operation in treatment areas being covered by Hospital policy, simple recommendations or just ignored ? Has anyone researched this issue in regards to Radiation treatment equipment ? Any information would be greatly appreciated. Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SIA - Service Industry Association (adv.) Message-ID: <000001c0c209$73f4ef60$b631a8ac@dad> From: Steve Schwarz To: linac-eng@plato1.aristotle.net Subject: SIA - Service Industry Association (adv.) Date: Tue, 10 Apr 2001 13:57:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Independent Service Providers and Organizations, Unite! There IS strength in numbers!! -Are you tired of the predatory practices of some manufacturer's using illegal tactics to keep you from servicing the equipment they manufacture? -Are you sick of some manufacturers who won't give you access to parts, information & training - unless you have a service contract? -Are you fed up with some manufacturer's using illegal & unethical sales tactics to interfere with your service business and spread fear, uncertainty & doubt to your customers? -Are you frustrated by the illegal tying of software and hardware support to equipment purchases, effectively locking out independents from providing ANY service, drastically limiting the end users choices? -Are you concerned at the millions of dollars that many of the big manufacturers spend to lobby congress and the regulatory agencies to keep things the way the manufacturers like them, so they can continue to step on independent and in-house servicers with impunity? -Do you need a forum where you can meet other independents in the medical service industry where you can talk with, learn from and potentially partner with? If any of the above applies, join or implore your company or institution leaders to join the SIA - the Service Industry Association. The SIA was formed for independents, large & small, by independents, to address the needs of its members with legal information and special interest group support, legislative lobbying, business to business partnering and to ensure that freedom of choice remains an option for the end users so that you have the support you need to survive & thrive as an independent service provider. The SIA's legal counsel is Ron Katz, a nationally recognized & published anti-trust litigation expert & open market advocate who has for over 15 years worked tirelessly to keep the service markets open. The SIA board of directors consists of medical industry leaders such as Dr. Malcolm Ridgway of Masterplan who provides a plethora of useful information for all members; the SIA membership has almost 200 companies with over 20,000 employees strong - from fortune 500 companies such as Northrop Grumman, to small one person ISO's. And all benefit from the association and the collaboration. As an SIA member, you have access to beneficial information you probably never knew existed. As an SIA member, you are not alone. The value is there and the cost to join is minimal, considering the huge benefit this organization can bring to your business and the freedom of choice this association ensures for us all. Manufacturer's of course are welcome to join - but only if they agree to do business according to the tenets of the SIA. For those manufacturer's out there who are predatory in practice and are trying to use their monopoly power & financial strength in the industry to squeeze everyone else out of the service market, For those manufacturer's who want to limit the end users choices for their own profit motives, for those manufacturer's that are trying to destroy the independent service movement, market & freedom of choice; Beware - the SIA will be there to call you to the carpet. Check out www.servicenetwork.org & if you agree with the tenets of the association, you need to join and support this organization - you can't afford not too. Don't wait until it's too late! Visit www.servicenetwork.org for more info & online registration. Please feel free to email me if you are interested in discussing our experiences with the SIA or contact the SIA's executive director, Ms. Claudia Betzner at CBetzner@servicenetwork.org or 1-858 720 8200. My Regards to the list, Steve Schwarz Acceletronics, Inc. member and sponsor of the SIA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: "subscribe to list" Message-ID: <003801c0c1f3$8793d4c0$4516d20a@fhcs.org> From: David Devito To: linac-eng@plato1.aristotle.net Subject: "subscribe to list" Date: Tue, 10 Apr 2001 11:22:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Superior Electric PCB Alignment Proceedure Message-ID: <87DA8A9ECCCFD211B51E0008C7B1558506E507CC@ftwex03.ftw.medcity.net> From: Tirabassi Michael To: "'GARRYANGEL@aol.com'" Cc: "Linac-eng (E-mail)" Subject: RE: Superior Electric PCB Alignment Proceedure Date: Tue, 10 Apr 2001 06:38:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Yo Gary, In the 1800 databook on page 6-30 Drawing # 885548, notes 3,10 & 11 give info for pot adjustments R1-R4 on this pcb. If you don't have this drawing I can tell you what the notes say. Also I'ld like to know who you got the pcb from. Tanks! MR. T. > -----Original Message----- > From: GARRYANGEL@aol.com [SMTP:GARRYANGEL@aol.com] > Sent: Monday, April 09, 2001 6:33 PM > To: linac-eng@plato1.aristotle.net > Subject: Superior Electric PCB Alignment Proceedure > > Hi Everyone ... > > I'm trying to locate an alignment procedure for the Superior Electric PCB > in > the Carousel Chassis of the Varian Cl-1800. I have a new PCB that I'd like > to > install. > > Thanks in advance for your assistance !!! > > Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Rebuilt maggie M5193 Message-ID: From: "Rozenblat, Alex" To: 'linac' Subject: Rebuilt maggie M5193 Date: Tue, 10 Apr 2001 04:13:17 -0800 Importance: low X-Priority: 5 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you everyone for your opinion about rebuilt M5193. I guess, it's up to person (and financial goals of his/her boss) to risk the time and the efforts in an attempt to save some buck. Alex Rozenblat Electronics Technologist, TSRCC, Toronto, Canada Phone: 416-480-4396 Opinions, suggestions and ideas expressed above don't necessarily reflect those of the management of the Organization or any other person but signed. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varis or Impac or Others? Message-ID: <002b01c0c152$1115e320$f14e56d1@martha> From: Daryl Knox To: "Turner, Guy" , 'rtexec' , Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: Re: Varis or Impac or Others? Date: Mon, 9 Apr 2001 16:06:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just a note, Lantis is a very close kin to Impact. Daryl ----- Original Message ----- From: Turner, Guy To: 'rtexec' ; Cc: Sent: Monday, April 09, 2001 12:20 PM Subject: RE: Varis or Impac or Others? > > "Just one more thing. As to the choice of Varian's Varis or Impac's > Impac, just remember that there is also Lantis from Siemens, RT Desktop > from Elekta and Visir from MDS Nordion. So look around a little." > > One note - Lantis is really just IMPAC. > > Guy Turner, Ext. 6247 > Radiation Service Engineer > Information Security Manager > "Any Enterprise > When Fairly Once Begun > Should Not Be Left > Until All That Ought Is Won" > > PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or > legally effective electronic signature. (2) this message may contain > legally privileged or confidential information. If you are not the intended > recipient of this message, please notify us, disregard the foregoing > message, and delete the message immediately. We apologize for any > inconvenience this may have caused. > > > > > -----Original Message----- > From: rtexec [mailto:rtexec@pd.jaring.my] > Sent: Monday, April 09, 2001 3:19 AM > To: Dave.Pinchin@cdhb.govt.nz > Cc: linac-eng@plato1.aristotle.net > Subject: Varis or Impac or Others? > > > > Dave: > > The point you make concerning vendors saying "Its the other guy's > machine , not ours" is probably as old as technology but completely > valid. Meanwhile the finger pointing goes on, your still waiting and > slowly boiling. A single vendor is a good solution from the engineering > point of view. But what you gain in technical security you lose in > freedom of choice. > > Being able to choose the best equipment available is what every > radiotherapy department should be able to do. When you stay with a > single vendor then your choice is the best that they have to offer. > These two choices are not always the same thing. The differences can be > function, price and support. > > Now in the perfect world that none of us has ever seen the vendors would > realize that whoever provides good support wins the customers heart. > This does happen. A good example is the recent posting concerning > excellent support provided by Siemens for a hospital's MLC problems. The > work done had been above and beyond what the hospital expected and they > let us all know. I am sure that the hospital will remember the vendor > the next time they consider an equipment purchase. But maybe we should > make sure the vendors know that we expect this type of support. If you > are not getting cooperation go to the top. If you want their names and > numbers just ask me. I am sure they would love to hear from you if they > haven't already read these postings. Actually they do care its just that > ------- fill in your own standard vendor excuse ------!!! > > Now I apologize to any vendor who takes objection to my tone. I know > what every one of them is capable of doing, both good and bad. > But the vendors have to develop an awareness that the radiotherapy > department is getting very complicated now. No single vendor can truly > meet all the customers needs. They have to learn that a little > cooperation between competitors is not a bad thing. Hey, and we all know > they really do want us to be satisfied with their products. > > Just one more thing. As to the choice of Varian's Varis or Impac's > Impac, just remember that there is also Lantis from Siemens, RT Desktop > from Elekta and Visir from MDS Nordion. So look around a little. > > Sid Mauck > RT Exec > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Superior Electric PCB Alignment Proceedure Message-ID: <32.133fbc36.2803a0bf@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Superior Electric PCB Alignment Proceedure Date: Mon, 9 Apr 2001 15:33:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone ... I'm trying to locate an alignment procedure for the Superior Electric PCB in the Carousel Chassis of the Varian Cl-1800. I have a new PCB that I'd like to install. Thanks in advance for your assistance !!! Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "'jsomers@accuray.com'" , "Turner, Guy" , 'rtexec' , Dave.Pinchin@cdhb.govt.nz, "Turner, Guy" Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Mon, 9 Apr 2001 12:58:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does IMPAC support Varian's generation 6???????? -- On Mon, 9 Apr 2001 14:01:02 Turner, Guy wrote: >I guess I could have elaborated a bit more. I tend to look at things >through the lense of being responsible for Varian linacs and simulators >only. If you subtract the Siemens functionality from Lantis, what you are >left with is IMPAC. > >Guy Turner, Ext. 6247 >Radiation Service Engineer >Information Security Manager >"Any Enterprise >When Fairly Once Begun >Should Not Be Left >Until All That Ought Is Won" > >PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or >legally effective electronic signature. (2) this message may contain >legally privileged or confidential information. If you are not the intended >recipient of this message, please notify us, disregard the foregoing >message, and delete the message immediately. We apologize for any >inconvenience this may have caused. > > > > >-----Original Message----- >From: John Somers [mailto:jsomers@accuray.com] >Sent: Monday, April 09, 2001 1:39 PM >To: 'Turner, Guy'; 'rtexec'; Dave.Pinchin@cdhb.govt.nz >Cc: linac-eng@plato1.aristotle.net >Subject: RE: Varis or Impac or Others? > > >Guy, and list members, I think there's a little more to consider. Kind of >like "A one-ton van is not the same as a one-ton flatbed truck", even though >both may be built on the same frame. > LANTIS is built on the same backbone, but is both more and less than >IMPAC, >not exactly "just IMPAC". More in that it incorporates some features >developed by Siemens specifically for treatment delivery with Siemens >machines. Less in that LANTIS sometimes lags with the latest features from >IMPAC, and may be less optimal in configuring treatment delivery on >non-Siemens equipment. Pricing, post-purchase support, interfacing with >other software, such as the institutional patient management databases, can >all be different between the two as well. There may also be differences >external to the Radiation Oncology aspects, since both have other modules >for Medical Oncology, Lab reports, etc. > There are enough differences that potential users/buyers would probably >want to examine those closely and choose appropriately for their own needs. > For these systems and other significant purchase selections I >recommend to >listen to the suppliers, but be darn sure you talk to current users >(customers, both satisfied and unsatisfied) to find out how things are >actually working out for them. This list and contacts from it, as well as >other similar lists, provide one good starting point for that. > > Cheers, > John Somers > > > >-----Original Message----- >From: owner-linac-eng@plato1.aristotle.net >[mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Turner, Guy >Sent: Monday, April 09, 2001 9:21 AM >Cc: linac-eng@plato1.aristotle.net >Subject: RE: Varis or Impac or Others? > > > >"Just one more thing. As to the choice of Varian's Varis or Impac's >Impac, just remember that there is also Lantis from Siemens, RT Desktop >from Elekta and Visir from MDS Nordion. So look around a little." > >One note - Lantis is really just IMPAC. > >Guy Turner, Ext. 6247 > Get 250 color business cards for FREE! at Lycos Mail http://mail.lycos.com/freemail/vistaprint_index.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: From: "Turner, Guy" To: "'jsomers@accuray.com'" , "Turner, Guy" , 'rtexec' , Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Mon, 9 Apr 2001 11:01:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I guess I could have elaborated a bit more. I tend to look at things through the lense of being responsible for Varian linacs and simulators only. If you subtract the Siemens functionality from Lantis, what you are left with is IMPAC. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. -----Original Message----- From: John Somers [mailto:jsomers@accuray.com] Sent: Monday, April 09, 2001 1:39 PM To: 'Turner, Guy'; 'rtexec'; Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Guy, and list members, I think there's a little more to consider. Kind of like "A one-ton van is not the same as a one-ton flatbed truck", even though both may be built on the same frame. LANTIS is built on the same backbone, but is both more and less than IMPAC, not exactly "just IMPAC". More in that it incorporates some features developed by Siemens specifically for treatment delivery with Siemens machines. Less in that LANTIS sometimes lags with the latest features from IMPAC, and may be less optimal in configuring treatment delivery on non-Siemens equipment. Pricing, post-purchase support, interfacing with other software, such as the institutional patient management databases, can all be different between the two as well. There may also be differences external to the Radiation Oncology aspects, since both have other modules for Medical Oncology, Lab reports, etc. There are enough differences that potential users/buyers would probably want to examine those closely and choose appropriately for their own needs. For these systems and other significant purchase selections I recommend to listen to the suppliers, but be darn sure you talk to current users (customers, both satisfied and unsatisfied) to find out how things are actually working out for them. This list and contacts from it, as well as other similar lists, provide one good starting point for that. Cheers, John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Turner, Guy Sent: Monday, April 09, 2001 9:21 AM Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? "Just one more thing. As to the choice of Varian's Varis or Impac's Impac, just remember that there is also Lantis from Siemens, RT Desktop from Elekta and Visir from MDS Nordion. So look around a little." One note - Lantis is really just IMPAC. Guy Turner, Ext. 6247 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: <000201c0c124$4bbc7800$630109c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: "'Turner, Guy'" , 'rtexec' , Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Mon, 9 Apr 2001 10:38:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Guy, and list members, I think there's a little more to consider. Kind of like "A one-ton van is not the same as a one-ton flatbed truck", even though both may be built on the same frame. LANTIS is built on the same backbone, but is both more and less than IMPAC, not exactly "just IMPAC". More in that it incorporates some features developed by Siemens specifically for treatment delivery with Siemens machines. Less in that LANTIS sometimes lags with the latest features from IMPAC, and may be less optimal in configuring treatment delivery on non-Siemens equipment. Pricing, post-purchase support, interfacing with other software, such as the institutional patient management databases, can all be different between the two as well. There may also be differences external to the Radiation Oncology aspects, since both have other modules for Medical Oncology, Lab reports, etc. There are enough differences that potential users/buyers would probably want to examine those closely and choose appropriately for their own needs. For these systems and other significant purchase selections I recommend to listen to the suppliers, but be darn sure you talk to current users (customers, both satisfied and unsatisfied) to find out how things are actually working out for them. This list and contacts from it, as well as other similar lists, provide one good starting point for that. Cheers, John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Turner, Guy Sent: Monday, April 09, 2001 9:21 AM Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? "Just one more thing. As to the choice of Varian's Varis or Impac's Impac, just remember that there is also Lantis from Siemens, RT Desktop from Elekta and Visir from MDS Nordion. So look around a little." One note - Lantis is really just IMPAC. Guy Turner, Ext. 6247 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis or Impac or Others? Message-ID: From: "Turner, Guy" To: 'rtexec' , Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: RE: Varis or Impac or Others? Date: Mon, 9 Apr 2001 08:20:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "Just one more thing. As to the choice of Varian's Varis or Impac's Impac, just remember that there is also Lantis from Siemens, RT Desktop from Elekta and Visir from MDS Nordion. So look around a little." One note - Lantis is really just IMPAC. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. -----Original Message----- From: rtexec [mailto:rtexec@pd.jaring.my] Sent: Monday, April 09, 2001 3:19 AM To: Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: Varis or Impac or Others? Dave: The point you make concerning vendors saying "Its the other guy's machine , not ours" is probably as old as technology but completely valid. Meanwhile the finger pointing goes on, your still waiting and slowly boiling. A single vendor is a good solution from the engineering point of view. But what you gain in technical security you lose in freedom of choice. Being able to choose the best equipment available is what every radiotherapy department should be able to do. When you stay with a single vendor then your choice is the best that they have to offer. These two choices are not always the same thing. The differences can be function, price and support. Now in the perfect world that none of us has ever seen the vendors would realize that whoever provides good support wins the customers heart. This does happen. A good example is the recent posting concerning excellent support provided by Siemens for a hospital's MLC problems. The work done had been above and beyond what the hospital expected and they let us all know. I am sure that the hospital will remember the vendor the next time they consider an equipment purchase. But maybe we should make sure the vendors know that we expect this type of support. If you are not getting cooperation go to the top. If you want their names and numbers just ask me. I am sure they would love to hear from you if they haven't already read these postings. Actually they do care its just that ------- fill in your own standard vendor excuse ------!!! Now I apologize to any vendor who takes objection to my tone. I know what every one of them is capable of doing, both good and bad. But the vendors have to develop an awareness that the radiotherapy department is getting very complicated now. No single vendor can truly meet all the customers needs. They have to learn that a little cooperation between competitors is not a bad thing. Hey, and we all know they really do want us to be satisfied with their products. Just one more thing. As to the choice of Varian's Varis or Impac's Impac, just remember that there is also Lantis from Siemens, RT Desktop from Elekta and Visir from MDS Nordion. So look around a little. Sid Mauck RT Exec ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: pet scanner Message-ID: <11027385.986830521989.JavaMail.imail@prance.excite.com> From: mike nordin To: Linac-eng@plato1.aristotle.net Subject: pet scanner Date: Mon, 9 Apr 2001 07:35:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm looking for information on facility reauirements for a pet scanner Can anyone recommend a web site? _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Slang Message-ID: From: "Rozenblat, Alex" To: 'linac' Subject: Slang Date: Mon, 9 Apr 2001 05:49:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" About toilet seat. We have new Primus machines (Siemens) which Beamview attachment is equipped now with big frame as a touch guard. We call it "Toilet seat" for two reasons - resemblance and troubles. But I guess nothing new on this planet as far as "names" are concerned. Alex Rozenblat Electronics Technologist, TSRCC, Toronto, Canada Phone: 416-480-4396 Opinions, suggestions and ideas expressed above don't necessarily reflect those of the management of the Organization or any other person but signed. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varis or Impac or Others? Message-ID: <3AD17075.86E42857@pd.jaring.my> From: rtexec To: Dave.Pinchin@cdhb.govt.nz Cc: linac-eng@plato1.aristotle.net Subject: Varis or Impac or Others? Date: Mon, 9 Apr 2001 00:19:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dave: The point you make concerning vendors saying "Its the other guy's machine , not ours" is probably as old as technology but completely valid. Meanwhile the finger pointing goes on, your still waiting and slowly boiling. A single vendor is a good solution from the engineering point of view. But what you gain in technical security you lose in freedom of choice. Being able to choose the best equipment available is what every radiotherapy department should be able to do. When you stay with a single vendor then your choice is the best that they have to offer. These two choices are not always the same thing. The differences can be function, price and support. Now in the perfect world that none of us has ever seen the vendors would realize that whoever provides good support wins the customers heart. This does happen. A good example is the recent posting concerning excellent support provided by Siemens for a hospital's MLC problems. The work done had been above and beyond what the hospital expected and they let us all know. I am sure that the hospital will remember the vendor the next time they consider an equipment purchase. But maybe we should make sure the vendors know that we expect this type of support. If you are not getting cooperation go to the top. If you want their names and numbers just ask me. I am sure they would love to hear from you if they haven't already read these postings. Actually they do care its just that ------- fill in your own standard vendor excuse ------!!! Now I apologize to any vendor who takes objection to my tone. I know what every one of them is capable of doing, both good and bad. But the vendors have to develop an awareness that the radiotherapy department is getting very complicated now. No single vendor can truly meet all the customers needs. They have to learn that a little cooperation between competitors is not a bad thing. Hey, and we all know they really do want us to be satisfied with their products. Just one more thing. As to the choice of Varian's Varis or Impac's Impac, just remember that there is also Lantis from Siemens, RT Desktop from Elekta and Visir from MDS Nordion. So look around a little. Sid Mauck RT Exec ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re Impac vs Varis. Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Re Impac vs Varis. Date: Sun, 8 Apr 2001 20:18:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Not to be misunderstood. I am an engineer of wide experience. I spent 12 years in the reel computer industry.... (refering to tape drives). I am one of the few in the world who actually has a personal copy of the RS232 standard. (Incidently, I have NEVER found a device which is 100% compliant). My comments were of a general nature based on my experience of the multivendor situaltion. They were NOT based on my linac experience. My particular linac experience is based on a single vendor. In Marty's reply the problem is clearly layed at one door. There is none of this 'engineer-in-the-middle' syndrome where the client is guaranteed to lose. I rest my case. I must also state that I do not like monopolies. :D ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varis/Vision or Impact? Message-ID: <000a01c0c0a4$bbab2920$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: 'Dave Pinchin' , linac-eng@plato1.aristotle.net Subject: RE: Varis/Vision or Impact? Date: Sun, 8 Apr 2001 19:25:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Given your argument it would appear that you may have experienced some difficulty with a leading equipment manufacturer's problem solving technique. I was somewhat bewildered by the recent discussion on the proper technique of turning "on" a Varian linac with MLC and Varis. I would have thought that given the single vendor source that Varian might have supplied that level of information on request. It was interesting that given the detailed discussion presented on this BBS that nobody representing Varian chose to respond. My experience leads me to believe that the various Impac products are superior in most applications. Even Varian tried to buy it! (the company that is.) Still, in most cases both manufacturers have products that will fit the bill. I really don't mean to bash Varian as they truly are a world class manufacturer with a wide variety of first rate products and services. Its just that the radiation oncology field is very diverse and growing even more so. One must thoroughly review his own situation and needs before choosing the vendor. It probably matters little to your institution what another hospital uses as they may have different requirements. What matters most is what's best for your hospital. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Dave Pinchin Sent: Sunday, April 08, 2001 7:38 PM To: linac-eng@plato1.aristotle.net Subject: Re: Varis/Vision or Impact? Gday, There is an issue which needs to be considered very seriously when 'mix and match'ing. You will recognise the scenario......... 1/ Some machine doesn't work.... 2/ Call agent for machine not working.... "It's not our gear that's failed. It's the other bit........ 3/ Call the agent for the other bit.... "No it's not our bit. It's definitely the machine over there...... 4/ GOTO 2/ The final outcome is the machine never gets fixed and because each company claims their machine is not at fault the calls become chargable and the bill grows at each itteration....... It may even be TRUE that neither piece is at fault........... Further, as time goes on, one component may be updated which WILL cause a whole new set of problems... There is a lot to be said for the one vendor approach. Think about it anyway......... Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varis/Vision or Impact? Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Re: Varis/Vision or Impact? Date: Sun, 8 Apr 2001 15:38:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gday, There is an issue which needs to be considered very seriously when 'mix and match'ing. You will recognise the scenario......... 1/ Some machine doesn't work.... 2/ Call agent for machine not working.... "It's not our gear that's failed. It's the other bit........ 3/ Call the agent for the other bit.... "No it's not our bit. It's definitely the machine over there...... 4/ GOTO 2/ The final outcome is the machine never gets fixed and because each company claims their machine is not at fault the calls become chargable and the bill grows at each itteration....... It may even be TRUE that neither piece is at fault........... Further, as time goes on, one component may be updated which WILL cause a whole new set of problems... There is a lot to be said for the one vendor approach. Think about it anyway......... Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: slang Message-ID: <002b01c0bfb8$9475a700$0c9956d1@martha> From: Daryl Knox To: Nelson Lacsina , Kerry.Price@advocatehealth.com, linac-eng@plato1.aristotle.net, owner-linac-eng@plato1.aristotle.net Subject: Re: slang Date: Sat, 7 Apr 2001 15:15:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If I'm not mistaken, correct me you old Varian reps if I'm wrong but, the original toilet seat was the head on the 2500 that had to be hand cranked out of the way to work on the head. Daryl Knox ----- Original Message ----- From: Nelson Lacsina To: ; ; Sent: Friday, April 06, 2001 1:30 PM Subject: Re: slang > I work with some ancients guys and they have stumped me with a couple of terms.... I've been working in the business going on my second year, and biomed for seven and half, but I've never heard these terms: WD40 is called wild dog.....A forklift is called a tow motor......an AC pigtail is called a zip cord.....and the accessory mount is called a toilet seat.....WOW where did they come up with this stuff. My boss told me that I needed to put some wild dog on the toilet seat because it wasn't clicking in right....I didn't know what the heck he was talking about....I guess it was before my time. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Slang Message-ID: <005101c0beed$cd05a640$d3206f40@oem773> From: Ken Wright To: Robert Wood , Stuart.Vessey@gstt.sthames.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: Slang Date: Fri, 6 Apr 2001 15:03:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" or... Tight is tight. Too tight is loose again. ----- Original Message ----- From: Robert Wood To: ; Sent: Friday, April 06, 2001 11:13 AM Subject: Slang > Don't forget when tighting a bolt. "Tighten it to just about 1/4 turn before it breaks" > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: slang Message-ID: From: Nelson Lacsina To: Kerry.Price@advocatehealth.com, linac-eng@plato1.aristotle.net, owner-linac-eng@plato1.aristotle.net Subject: Re: slang Date: Fri, 6 Apr 2001 09:30:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I work with some ancients guys and they have stumped me with a couple of terms.... I've been working in the business going on my second year, and biomed for seven and half, but I've never heard these terms: WD40 is called wild dog.....A forklift is called a tow motor......an AC pigtail is called a zip cord.....and the accessory mount is called a toilet seat.....WOW where did they come up with this stuff. My boss told me that I needed to put some wild dog on the toilet seat because it wasn't clicking in right....I didn't know what the heck he was talking about....I guess it was before my time. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Slang/Quotes Message-ID: From: "Turner, Guy" To: "'tcullen@wfubmc.edu'" , "Linac Engineers (E-mail)" Subject: RE: Slang/Quotes Date: Fri, 6 Apr 2001 10:34:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I live and die by that one!! Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. -----Original Message----- From: tcullen@wfubmc.edu [mailto:tcullen@wfubmc.edu] Sent: Friday, April 06, 2001 11:42 AM To: Linac Engineers (E-mail) Subject: Re: Slang/Quotes For the show-offs, who during casual conversation, can tell you every signal both going and coming out of the console electronics cabinet...."You know, Albert Einstein said don't ever commit anything to memory if you know where to look it up." Tim ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Slang/Quotes Message-ID: <3ACDF1C5.173E3C1B@wfubmc.edu> From: tcullen@wfubmc.edu To: "Linac Engineers (E-mail)" Subject: Re: Slang/Quotes Date: Fri, 6 Apr 2001 08:41:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For the show-offs, who during casual conversation, can tell you every signal both going and coming out of the console electronics cabinet...."You know, Albert Einstein said don't ever commit anything to memory if you know where to look it up." Tim ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Room door interlocks Message-ID: From: David Burgess To: paul.twyman@addenbrookes.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: Room door interlocks Date: Fri, 6 Apr 2001 08:32:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Paul, We use switches by EATON (Cutler-Hammer). They are Normally Open and close when the door is closed into its frame. EATON part # is 8411K12, but see also Cuttler-Hammer as it depends on how your supplier lists the brand name. We use these because they are cheap, reliable and readily available ( they are a vault door switch - re banks and such ). They are recessed into the door frame and are tamper proof from the outside. In North America they are available at Newark and their Newark Part # is 23F439 at $CA 6.10, They have 880 on hand. Also they are available from Electrosonic under part # 080 8411K12 at $CA 4.73. They have over 3000 on hand. Mounting plates are also shown in their cataloges. Best regards David Burgess Nova Scotia Cancer Centre >>> "Twyman, Paul" 4/5/2001 1:07:41 PM >>> Hello fellow hard working linac engineers. I wonder if anyone can offer some advice on an issue of door interlock switches for treatment room doors. We are currently building 2 new accelerator bunkers here at Addenbrookes hospital and I need to source some appropriate door interlock switches. On our existing treatment room doors we have the Burgess BSM 360 lever arm positive action type switches. These are the grey box type with the lever arm that can be adjusted for length and rotational position. The manufacturer, Burgess, no longer supplies these and cannot offer an alternative. What are other people using and where can I get them from? Thank you in advance, Paul Twyman ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Slang Message-ID: From: Robert Wood To: Stuart.Vessey@gstt.sthames.nhs.uk, linac-eng@plato1.aristotle.net Subject: Slang Date: Fri, 6 Apr 2001 07:13:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Don't forget when tighting a bolt. "Tighten it to just about 1/4 turn before it breaks" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Slang Message-ID: From: Robert Wood To: Ben.Heil@hrcc.on.ca, linac-eng@plato1.aristotle.net Subject: Slang Date: Fri, 6 Apr 2001 07:10:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I found it interesting that about three of our group sent me the old slang discussion that we had from way back in Jan 2000. I already had it but I find it interesting that several others have the same sence of humor and would retain this discussion. I know that there are some great lines out there and I expect that Jerry Maddox, Tim Cullin, Tom Bush and several others are withholding some of their good ones. Come on guys. Cough up. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: LAWS OF PHYSICS Message-ID: From: "Fort, Don" To: "'Linac-Eng (E-mail)'" Subject: LAWS OF PHYSICS Date: Fri, 6 Apr 2001 05:39:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" There's an old Firesign Theater axiom, If you push something hard enough, it will fall down, commonly known as Fudd's first law. Practical implications include the "push over". The comments expressed herein are my own and do not necessarily reflect the official positions of this institution. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: LAWS OF PHYSICS Message-ID: From: Kerry Price To: linac-eng@plato1.aristotle.net, owner-linac-eng@plato1.aristotle.net Subject: Re: LAWS OF PHYSICS Date: Fri, 6 Apr 2001 05:17:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Fact of life or law of physics? A dropped slice of buttered bread always lands butter-side down. A cat always lands on it's feet. What happens if a slice of buttered bread is secured onto the back of a cat? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Laws of Physics Message-ID: <002c01c0be9d$e6437f60$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "Linac-Eng (E-mail)" Subject: Laws of Physics Date: Fri, 6 Apr 2001 05:31:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The one law of physics that has stayed with me was one I heard from an installer out west. While working in a very tight space he said, " you know, just because you can see a nut doesn't mean you can turn it". I believe this observation relates to the Heisenberg Uncertainty Principle. Marty Shapiro ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: LAWS OF PHYSICS Message-ID: From: "Fort, Don" To: 'Kerry Price' Cc: "'linac-eng@plato1.aristotle.net'" , "'owner-linac-eng@plato1.aristotle.net'" Subject: RE: LAWS OF PHYSICS Date: Fri, 6 Apr 2001 05:27:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Uh Kerry, the ASPCA wants to talk about your plans to do Schrodinger cat experiment... -----Original Message----- From: Kerry Price [mailto:Kerry.Price@advocatehealth.com] Sent: Friday, April 06, 2001 9:17 AM To: linac-eng@plato1.aristotle.net; owner-linac-eng@plato1.aristotle.net Subject: Re: LAWS OF PHYSICS Fact of life or law of physics? A dropped slice of buttered bread always lands butter-side down. A cat always lands on it's feet. What happens if a slice of buttered bread is secured onto the back of a cat? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: re:Slang Message-ID: <97546CB5812DD411BD8300508B6D77756C90E9@ex2.gstt.sthames.nhs.uk> From: Stuart.Vessey@gstt.sthames.nhs.uk To: linac-eng@plato1.aristotle.net Subject: re:Slang Date: Fri, 6 Apr 2001 04:51:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One of my favourite euphemisms is "undocumented feature" because no software supplier can ever admit to a bug. Stuart E Vessey Medical Technical Officer Guy's and St Thomas'Hospital NHS Trust ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SV: Slang Message-ID: From: terry.kearey@orebroll.se To: linac-eng@plato1.aristotle.net Subject: SV: Slang Date: Fri, 6 Apr 2001 04:31:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, My favourites are from a John Cleese "commercial" "It's broken." "What do you expect, you've been using it." "Who sold you this then?" Tel ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: re: Slang Message-ID: <85256A26.00414B82.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: Sean Murphy Cc: linac-eng@plato1.aristotle.net Subject: re: Slang Date: Fri, 6 Apr 2001 03:53:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My favorite is from a Bell Canada ad that ran in the 80's "The filbert flange isn't meshing with the grapple grommet." Or my other favorite....."They are fixing that in the next release. The next release works so good it is unbelievable" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: re: Slang Message-ID: <002601c0be86$3ac5a3a0$18a3883e@amdk6450> From: Sean Murphy Reply-To: Sean Murphy To: linac-eng@plato1.aristotle.net Subject: re: Slang Date: Thu, 5 Apr 2001 23:51:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all, Following the discussion on linac slang and terminology... I had a colleague that 'developed' the generalised theory that all electronic linac components run on smoke! To this day I have not managed to disprove this theory because if you let the smoke out of a chip, resistor etc it will stop working........ Regards Sean ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: LAWS OF PHYSICS Message-ID: <697DE9C94DFED211A6DB00A0C9067D87408CD4@bilbo.wph.trent.nhs.uk> From: glynn.wilson@sth.nhs.uk To: linac-eng@plato1.aristotle.net Subject: LAWS OF PHYSICS Date: Fri, 6 Apr 2001 01:07:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Interesting all this slang, but what about those certainties of life. Those laws of physics written in tablets of stone that will always affect we humble engineers. For example The law that states... Whenever there is more than one possibility causing a defect or symptom, any investigation will always result in the last one investigated being that cause. Also the law....Whenever any item with an adhesive side is dropped, that side shall always fall adhesive side down. Then of course....Any length of cable or rope when pulled shall always form a loop and snag on any available protudence no matter how inaccessable. Glynn Wilson REM Weston Park Hospital Sheffield UK ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Positions Available Message-ID: From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: Positions Available Date: Thu, 5 Apr 2001 15:37:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" RS&A, Inc. has positions for senior linac engineers. Must have five plus years experience and indepth training. RS&A, Inc. is an independent Service Organization based in North Carolina. We have openings at this time in both North Carolina and in Georgia. Excellent pay and benefits. Contact Carl Hill at 800-320-4332. Please visit our Web Site: http:/www.rsa-inc.com/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Slang Message-ID: <86256A25.007ECD65.00@utm-notesob1.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: Robert Wood Cc: ppradon2@mail.surfsouth.com, linac-eng@plato1.aristotle.net Subject: Re: Slang Date: Thu, 5 Apr 2001 15:03:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" "What was wrong with the machine?" "Bent henway." "What's a henway?" "Oh, three or four pounds, depends on whether its a roaster or a fryer." TimW "Robert Wood" on 04/05/2001 05:17:29 PM To: ppradon2@mail.surfsouth.com, linac-eng@plato1.aristotle.net cc: (bcc: Timothy J. Waldron/MDACC) Subject: Slang I just noticed that if has been over a year since we had a favorite slang discussion. The last one was great. This time lets not just include slang , but also clever sayings. IE after making a repair and returning a unit to service "Works good, lasts a long time, makes minium smoke." Or "What was wrong with it? " and as you walk away you reply "Blown trockney." ( I used this one so often that the Director requested that we lay in extra "Trockneys" because of their high failure rate.) Dick Thompson had a bunch of them and I am only aware of a couple. Some of the "real old" timers can contribute those words of wisdom. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Slang Message-ID: <9C688FB52A05D51194750002B325B5F74B166F@hrccex.hrcc.on.ca> From: "Heil, Ben" To: linac-eng@plato1.aristotle.net Subject: RE: Slang Date: Thu, 5 Apr 2001 14:44:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sometimes when we have a quick fix we tell the therapists that the machine just needed a good "pep talk". Ben Heil Hamilton Regional Cancer Centre -----Original Message----- From: Robert Wood [mailto:WOODR@slrmc.org] Sent: Thursday, April 05, 2001 6:17 PM To: ppradon2@mail.surfsouth.com; linac-eng@plato1.aristotle.net Subject: Slang I just noticed that if has been over a year since we had a favorite slang discussion. The last one was great. This time lets not just include slang , but also clever sayings. IE after making a repair and returning a unit to service "Works good, lasts a long time, makes minium smoke." Or "What was wrong with it? " and as you walk away you reply "Blown trockney." ( I used this one so often that the Director requested that we lay in extra "Trockneys" because of their high failure rate.) Dick Thompson had a bunch of them and I am only aware of a couple. Some of the "real old" timers can contribute those words of wisdom. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Slang Message-ID: From: Robert Wood To: ppradon2@mail.surfsouth.com, linac-eng@plato1.aristotle.net Subject: Slang Date: Thu, 5 Apr 2001 14:17:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I just noticed that if has been over a year since we had a favorite slang discussion. The last one was great. This time lets not just include slang , but also clever sayings. IE after making a repair and returning a unit to service "Works good, lasts a long time, makes minium smoke." Or "What was wrong with it? " and as you walk away you reply "Blown trockney." ( I used this one so often that the Director requested that we lay in extra "Trockneys" because of their high failure rate.) Dick Thompson had a bunch of them and I am only aware of a couple. Some of the "real old" timers can contribute those words of wisdom. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 120 leaf MLC Message-ID: From: "Orsolini, Joe D" To: "'Peter E. Vitali'" , "Linac-Engineers, Listserver" Subject: RE: 120 leaf MLC Date: Thu, 5 Apr 2001 11:28:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I really would suspect one of the IR diodes on the reader since its causing a problem on one wedge only. We had a reader that lost one of the IR diodes/receivers and wouldnt read the 45 degree wedge > -----Original Message----- > From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] > Sent: Wednesday, April 04, 2001 15:33 > To: Linac-Engineers, Listserver > Subject: 120 leaf MLC > > Afternoon to All: > > Has anyone had problems with using wedges in the interface mount on the > MLC? We are experiencing an intermittent problem with the 15 degree > wedge. > The therapist insert it, it locks in, but the interlock does not clear. > Unlike the newer machines I do not have the ability to see the interface > or > accessory mount information in service mode. I have taken the covers off > the interface mount and checked the optical reader board and connection. > With the older mounts I would have said it was a loose cable to the > optical reader board but this board has a different orientation. The only > other > option may be the two slot switches. Since this is a new Millennium > Multileaf Collimator I would not believe that the switches are going that > quickly. 6 months! > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Department of Radiation Physics > Yale-New Haven Hospital > 15 York Street > New Haven, CT. 06504 U.S.A. > Tel: 203 688-2948 > Fax: 203 688-3663 > E-Mail: peter.vitali@yale.edu > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Room door interlocks Message-ID: <8c.4c24745.27fe11b0@aol.com> From: Radsrus@aol.com To: paul.twyman@addenbrookes.nhs.uk, linac-eng@plato1.aristotle.net Subject: Re: Room door interlocks Date: Thu, 5 Apr 2001 10:21:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 04/05/2001 12:39:18 PM Central Daylight Time, paul.twyman@addenbrookes.nhs.uk writes: Subj:Room door interlocks Date:04/05/2001 12:39:18 PM Central Daylight Time From: paul.twyman@addenbrookes.nhs.uk (Twyman, Paul) Sender: owner-linac-eng@plato1.aristotle.net To: linac-eng@plato1.aristotle.net ('LINAC-ENG') Hello fellow hard working linac engineers. I wonder if anyone can offer some advice on an issue of door interlock switches for treatment room doors. We are currently building 2 new accelerator bunkers here at Addenbrookes hospital and I need to source some appropriate door interlock switches. On our existing treatment room doors we have the Burgess BSM 360 lever arm positive action type switches. These are the grey box type with the lever arm that can be adjusted for length and rotational position. The manufacturer, Burgess, no longer supplies these and cannot offer an alternative. What are other people using and where can I get them from? Thank you in advance, Paul Twyman Paul, you can check online at www.mcmaster.com and search on door interlock switch. You will then be presented with an array of options from which you can match to your exact situation/application. GL & hope this helps, Steve Schwarz The information contained in this e-mail message is intended only for the personal and confidential use of the recipient(s) named above. This message is an internal company management communication and/or work product and as such is privileged and confidential. If the reader of this message is not the intended recipient,you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify me immediately by e-mail, and delete the original message. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Room door interlocks Message-ID: From: "Twyman, Paul" To: 'LINAC-ENG' Subject: Room door interlocks Date: Thu, 5 Apr 2001 08:07:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello fellow hard working linac engineers. I wonder if anyone can offer some advice on an issue of door interlock switches for treatment room doors. We are currently building 2 new accelerator bunkers here at Addenbrookes hospital and I need to source some appropriate door interlock switches. On our existing treatment room doors we have the Burgess BSM 360 lever arm positive action type switches. These are the grey box type with the lever arm that can be adjusted for length and rotational position. The manufacturer, Burgess, no longer supplies these and cannot offer an alternative. What are other people using and where can I get them from? Thank you in advance, Paul Twyman ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 120 leaf MLC Message-ID: From: aengstle@gundluth.org To: "Peter E. Vitali" , linac-eng@plato1.aristotle.net Subject: Re: 120 leaf MLC Date: Thu, 5 Apr 2001 05:21:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I usually suspect the optical reader. You can look at the digital inputs screen to see if it is reading the code correctly (I seem to remember it says invalid if a code is missed). One of the ir diodes either went bad or I have seen where the solder connections on the back go bad from the constant pounding it gets from accessories, wedges being plugged in daily. Alan Engstler "Peter E. Vitali" To: "Linac-Engineers, Listserver" Sent by: cc: owner-linac-eng@plato1.ari Subject: 120 leaf MLC stotle.net 04/04/01 02:33 PM Afternoon to All: Has anyone had problems with using wedges in the interface mount on the MLC? We are experiencing an intermittent problem with the 15 degree wedge. The therapist insert it, it locks in, but the interlock does not clear. Unlike the newer machines I do not have the ability to see the interface or accessory mount information in service mode. I have taken the covers off the interface mount and checked the optical reader board and connection. With the older mounts I would have said it was a loose cable to the optical reader board but this board has a different orientation. The only other option may be the two slot switches. Since this is a new Millennium Multileaf Collimator I would not believe that the switches are going that quickly. 6 months! Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Stabilipan II Message-ID: <831FA63F4DAFD411950D00B0D0685032079710@rchtextr5.rcht_svr4.rcht.swest.nhs.uk> From: "Brown, Scott - RCHT" To: linac-eng@plato1.aristotle.net Subject: Siemens Stabilipan II Date: Thu, 5 Apr 2001 05:11:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, I am having problems sourcing the main adjustable voltage regulator for the UK console of the Siemens Stabilipan II. This device is a four pin T03 package voltage regulator part No. 78HGASC according to the diagram or 78HGK on the component. I could use a LM338 with slight redesign of the circuit but would prefer to keep it original if possible. Siemens have said that this console is now obsolete!!! Scott Brown - Electronics Engineer Medical Physics Dept Royal Cornwall Hospital ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varis/Vision or Impact? Message-ID: <3ACC6D8E.DE1D624D@mail.surfsouth.com> From: Rad Onc Reply-To: ppradon2@mail.surfsouth.com To: "Linac-Engineers, Listserver" Subject: Varis/Vision or Impact? Date: Thu, 5 Apr 2001 05:05:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" At the present moment our department is trying to decide whether to go with Varian's Varis/Vision system or with Impact? Any pro's or con's for either system? Would appreciate any comments. Guy Eason Phoebe Putney Memorial Hospital (229) 312-2280 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: TAXI chips for Varian MLC Message-ID: From: "Carl \"Randy\" La Foone" To: Rick Smith , linac-eng@plato1.aristotle.net Subject: RE: TAXI chips for Varian MLC Date: Wed, 4 Apr 2001 19:02:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Rick, after much searching, we've been able to obtain a quantity of the taxi chips you referred to in your email in february of this year. If you're still interested, please give us a call and we'll be glad to help you out. Good Luck, Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Rick Smith Sent: Friday, February 16, 2001 7:35 AM To: linac-eng@plato1.aristotle.net Subject: TAXI chips for Varian MLC Good Morning; I think this has been on here before, but either I lost it or didn't print it out. Does anyone know where I can get the TAXI chips for the Varian MLC other than from Varian? I tried Newark, and they said the manufacturer (AMD) has stopped making them and does not list a replacement. Any help would be appreciated. Rick Smith Harrington Cancer Center Amarillo TX ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: ACC FAULTS Message-ID: From: Electronics Mater To: GARRYANGEL@aol.com, linac-eng@plato1.aristotle.net Subject: Re: ACC FAULTS Date: Wed, 4 Apr 2001 15:21:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Garry, I've seen this type of problem before on our 600c3 #434 with s/w ver 5.4, 80 leaf mlc. It turned out to be the interface mount optical code reader assy. In service mode, digital i/p's screen look at the accessory code which will be 33hex with no accessory installed. With the faulty optical reader, no accessory code is displyed. ie: invalid. I believe the output of the diodes deteriate over time, which results in intermittant operation. Karl Stansfield. Newcastle Mater Hospital Down Under. >>> 04/05/01 03:51am >>> Hi Everyone ... We have a Cl-600C (C2) with ver 5.4 and 80 leaf MLC and we are experiencing intermittent ACC faults (sometimes accompanied by a COLL fault) at Beam ON and also during treatments. Any ideas ??? Thanks in advance!! Garry ********************************************************************* This message is intended for the addressee named and may contain confidential information. If you are not the intended recipient, please delete it and notify the sender. Views expressed in this message are those of the individual sender, and are not necessarily the views of NSW Health. ********************************************************************* ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: ACC FAULTS Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF981@phsexch6.partners.org> From: "Maddox, Buford J" To: "'GARRYANGEL@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: ACC FAULTS Date: Wed, 4 Apr 2001 13:17:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In my experience, coll fault is usually a switch. But if it has to do with beam on, suspect noise. What do the lights on the collimator show? The event log? Interested in the difference between 600c and 2100 for these faults, if any. Do magnetrons arcs cause any? > -----Original Message----- > From: GARRYANGEL@aol.com [SMTP:GARRYANGEL@aol.com] > Sent: Wednesday, April 04, 2001 1:52 PM > To: linac-eng@plato1.aristotle.net > Subject: ACC FAULTS > > Hi Everyone ... > > We have a Cl-600C (C2) with ver 5.4 and 80 leaf MLC and we are experiencing > intermittent ACC faults (sometimes accompanied by a COLL fault) at Beam ON > and also during treatments. > > Any ideas ??? Thanks in advance!! > > Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 2100C tuning assistance Message-ID: From: RSepulved@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100C tuning assistance Date: Wed, 4 Apr 2001 12:02:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Gentlemen/Ladies; I would appreciate your contacting me at 800-920-1476 if you have experience tuning a 2100C when you have an RF driver without a frequency meter. Thank you. Robert Sepulveda Robert.S@procomm222.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 120 leaf MLC Message-ID: <3ACB76A2.3A728A8A@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: 120 leaf MLC Date: Wed, 4 Apr 2001 11:33:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Afternoon to All: Has anyone had problems with using wedges in the interface mount on the MLC? We are experiencing an intermittent problem with the 15 degree wedge. The therapist insert it, it locks in, but the interlock does not clear. Unlike the newer machines I do not have the ability to see the interface or accessory mount information in service mode. I have taken the covers off the interface mount and checked the optical reader board and connection. With the older mounts I would have said it was a loose cable to the optical reader board but this board has a different orientation. The only other option may be the two slot switches. Since this is a new Millennium Multileaf Collimator I would not believe that the switches are going that quickly. 6 months! Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cl6/100 with ETR AVAILABLE !! Message-ID: <4e.13cf0a70.27fcbae8@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Cl6/100 with ETR AVAILABLE !! Date: Wed, 4 Apr 2001 09:59:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone ... I have a Cl-6/100 (vintage 1982) with a THREE year old ETR Couch. It has been DE-Installed and was operating prior to removal. It is available AS-IS, Installed. and/or Refurbished. If there is any interest please reply to this email. Kindest regards, Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: ACC FAULTS Message-ID: <25.13429fe5.27fcb927@aol.com> From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: ACC FAULTS Date: Wed, 4 Apr 2001 09:51:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone ... We have a Cl-600C (C2) with ver 5.4 and 80 leaf MLC and we are experiencing intermittent ACC faults (sometimes accompanied by a COLL fault) at Beam ON and also during treatments. Any ideas ??? Thanks in advance!! Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cl-2100 C w/ MLC NEEDED Message-ID: From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Cl-2100 C w/ MLC NEEDED Date: Wed, 4 Apr 2001 10:03:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Again ... I'm in need of a used Cl-2100C that will be available sometime this year. MLC is a plus. Willing to pay top dollar for the right system. Please let me know if there is anything available. Kindest regards, Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Xim Couch Top available Message-ID: <85256A24.00512256.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Xim Couch Top available Date: Wed, 4 Apr 2001 06:46:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a Ximatron Couch top that we removed to install a new EXACT couch top. Is anyone interested? Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Lasertec Lasers Message-ID: From: Neil Johnston To: jsomers@accuray.com, Eive.Rodestedt@liv.se, linac-eng@plato1.aristotle.net Subject: RE: Lasertec Lasers Date: Wed, 4 Apr 2001 05:48:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thought this might be helpful, with some insight into green lasers and = the technology behind them. They human eye is seven times as sensitive to green light as it is to = red light. The light from a green laser is about 4 to 5 times a bright as 635 nm = red diode or 632.8 nm red Helium Neon laser. Moreover green laser light are = not absorbed as much by the human skin as is red light. It is therefore = that green lasers are preferred in radiation oncology patient alignment applications. Particularly when they are used for alignment of patients = with a darker skin. First let us say. There are no green diode lasers. The technology to = get a green, high quality solid state laser is quite complex, and to get a = quality product, expensive. In order to get a green light the LAP laser uses a Diode Pumped Solid = State (DPSS) laser that excites an Yittrium Aluminum Garnet crystal doped = with Neodymiun(Nd): Nd:YAG. The crystal lases at 1064 nm. To obtain a visible beam from a Neodymium doped laser requires a = process to convert the 1064 nm output beam to a shorter wavelength. The beam is = passed with a high power IR 808 nm laser diode through a KTP (Potassium = Titanyl Phosphate) intracavity crystal which doubles the frequency to produce a green laser beam at 532 nm. All of these components are needed together with quality optics to form = a cavity, collimate the beam, and prevent stray IR from escaping, all = mounted in precise alignment. Temperature stabilization is also a big problem. Laser diodes have a = broad line width, and the center wavelength is strongly dependent on = temperature Some manufactures of green lasers use pulsed units to keep the = temperature down while pushing it harder to compensate for lower quality parts and = poor alignment. The LAP Astor green solid state lasers are continuous wave, = manufactured from high quality components with a unique active cooling system that incorporate a thermostatically controlled fan to extend the live = expectancy of the laser. We are not aware of any other manufacturer that uses the = LAP technology. If you would like any other information try our web site at: www.lap-america.com Neil Johnston LAP of America -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of John Somers Sent: Wednesday, March 28, 2001 12:44 PM To: Eive.Rodestedt@liv.se; linac-eng@plato1.aristotle.net Subject: RE: Lasertec Lasers David, Eive, Christian and list, Not all green lasers use the same technology. I think it's true that the Gammex green lasers giving the disappointing results were still based = on the old plasma tube type of emitters. The Emerald models of = Scanditronix green lasers are diode lasers. LAP green lasers are yet another = approach, probably best explained by the list members from that company (Neil, = are you there?) I'm not familiar with the Lasertec lasers. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Eive.Rodestedt@liv.se Sent: Wednesday, March 28, 2001 6:38 AM To: linac-eng@plato1.aristotle.net Subject: SV: Lasertec Lasers We use 5 Emerald from Scanditronix on the simulator and they had been working for 3 years now, without any problems. Eive Rodestedt Central Hospital Karlstad Sweden -----Ursprungligt meddelande----- Fr=E5n: roast_em@hotmail.com [mailto:roast_em@hotmail.com] Skickat: = den 28 mars 2001 16:06 Till: linac-eng@plato1.aristotle.net =C4mne: Re: Lasertec Lasers we dont use that brand, but Gammex fair no better. We spent a small = fortune on green lasers and now have gone back to red. They seem to only last = about a year or so and need replaceing,, at twice the purchase price and 1/10 = the life, that gets pretty expensive David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet = gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: "Christian Knopper" >Reply-To: >To: "Newsgroup Linac" <> >Subject: Lasertec Lasers >Date: Wed, 28 Mar 2001 10:38:06 +0200 > >Hello All! > >We are using Lasertec LYL 305 green Crosslasers for positioning the >patients. We have very often troubles with them. They get weak and 1 = hour >later bright again. And the lifetime is about 1 year although we only >switch >them on while positioning the patient. > >Does anybody have any expirience with this lasers. > >Best wishes > >Christian Knopper >LKH - Klagenfurt >Austria >Christian.Knopper@LKH-klu.at > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: PV on 2100cd (Varian) Message-ID: <9C688FB52A05D51194750002B325B5F7340E8B@hrccex.hrcc.on.ca> From: "Ukos, John" To: "Linac (E-mail)" Subject: PV on 2100cd (Varian) Date: Tue, 3 Apr 2001 16:16:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have lost two HV pcb's due to Q1 & Q3 failiures..any ideas? John Ukos Senior Electronics Technologist Hamilton Regional Cancer Centre Hamilton Ontario Canada (905) 387 9495 john.ukos@hrcc.on.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Mevatron magnetron Message-ID: <000801c0b921$0cd4b5e0$2cb21ec4@willpazdahome> From: Will Pazda To: "Rozenblat, Alex" , 'linac' Subject: Re: Siemens Mevatron magnetron Date: Fri, 30 Mar 2001 05:54:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Alex, I've tried 3 re-builds from CTL with mixed results. The first was an 5193 and we tried it in a MD2 (unshielded 'dog-box'). It was very noisy (electrically speaking) and it was crashing the various slave boards. We were in fact not able to out gas it and eventually put in a new one. We later tried it in a shielded modulator and it's working brilliantly, producing plenty RF at only 90amps Pulse I so there is still room to crank up the juice, also very stable, it's been in service over two years on a busy machine. At roughly 25% cost of a new one, well worth it !. The Second was installed in a conventional (6/15MV) mevatron. We had to push pulse I close to 110amps to get output on 15MV and this resulted in quite a few treatment terminating arcs. I think the tube may have been a bit gassy and could have come right, but we ended up replacing it with a new one, I intend trying this tube again though on a major PM. The third tube was a 5125 used on a Philips SL75/5. This tube was ordered in anticipation of a failure which never happened so consequently it sat on the shelf for two years. When we did come to use it, it was useless. Again the problem seems RF/electrical noise, so bad that it was causing some of the analogue steering coil circuits to max out (when in manual !) also coupled this time with very low RF output. So to summarise, in my opinion the tubes are not as good as new (although I've had a few dud new ones !). I would advise not leaving them on the shelf to long and if the cost of the re-builds remains as it is, then I'd say go for it, but have a new one spare just in case !. Will Pazda ----- Original Message ----- From: "Rozenblat, Alex" To: "'linac'" Sent: 29 March 2001 8:45 PM Subject: Siemens Mevatron magnetron > > Hello, mates > > Have a couple of questions related to magnetron 5193 installed on all > Siemens Mevatrons. > > 1. How many HV hours (average) - Rad On - one can expect from this maggy. We > usually get around 450 and are very happy. For some reason I believe it's > not the best we can do here. Main suspect - settings of ELM to maintain > proper maggy impedance. > > 2. Did anyone hear about "California tube laboratory, Inc." that promises to > rebuilt maggy and make it almost like new. One can safe significant amount > of money - or may be waste it? Any opinion or experience? > > > Alex Rozenblat, > TSRCC, Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varain MLC torque-ampere Message-ID: <3AC48B3D.E81829E5@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varain MLC torque-ampere Date: Fri, 30 Mar 2001 05:33:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We can measure MLC motor ampere and toqure-ampere with Varian's MLC service box Could any one advise what does the torque-ampere means? How do we relate the torque-ampere with the MLC motor? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Mevatron magnetron Message-ID: From: "Rozenblat, Alex" To: 'linac' Subject: Siemens Mevatron magnetron Date: Thu, 29 Mar 2001 10:45:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, mates Have a couple of questions related to magnetron 5193 installed on all Siemens Mevatrons. 1. How many HV hours (average) - Rad On - one can expect from this maggy. We usually get around 450 and are very happy. For some reason I believe it's not the best we can do here. Main suspect - settings of ELM to maintain proper maggy impedance. 2. Did anyone hear about "California tube laboratory, Inc." that promises to rebuilt maggy and make it almost like new. One can safe significant amount of money - or may be waste it? Any opinion or experience? Alex Rozenblat, TSRCC, Toronto, Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Thumb wheel switches. Message-ID: From: "Warren, John" To: "'linac-eng@plato1.aristotle.net'" Subject: Thumb wheel switches. Date: Thu, 29 Mar 2001 02:06:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank you to the people that responded to my message concerning thumb wheel switches. I should have added that they are on the console desk for setting 'Set Time' and 'Set Dose.' John ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Lasertec Lasers Message-ID: <000201c0b7ae$a8758340$630109c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: Eive.Rodestedt@liv.se, linac-eng@plato1.aristotle.net Subject: RE: Lasertec Lasers Date: Wed, 28 Mar 2001 09:43:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable David, Eive, Christian and list, Not all green lasers use the same technology. I think it's true that the Gammex green lasers giving the disappointing results were still based = on the old plasma tube type of emitters. The Emerald models of = Scanditronix green lasers are diode lasers. LAP green lasers are yet another = approach, probably best explained by the list members from that company (Neil, = are you there?) I'm not familiar with the Lasertec lasers. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Eive.Rodestedt@liv.se Sent: Wednesday, March 28, 2001 6:38 AM To: linac-eng@plato1.aristotle.net Subject: SV: Lasertec Lasers We use 5 Emerald from Scanditronix on the simulator and they had been working for 3 years now, without any problems. Eive Rodestedt Central Hospital Karlstad Sweden -----Ursprungligt meddelande----- Fr=E5n: roast_em@hotmail.com [mailto:roast_em@hotmail.com] Skickat: = den 28 mars 2001 16:06 Till: linac-eng@plato1.aristotle.net =C4mne: Re: Lasertec Lasers we dont use that brand, but Gammex fair no better. We spent a small = fortune on green lasers and now have gone back to red. They seem to only last = about a year or so and need replaceing,, at twice the purchase price and 1/10 = the life, that gets pretty expensive David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet = gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: "Christian Knopper" >Reply-To: >To: "Newsgroup Linac" <> >Subject: Lasertec Lasers >Date: Wed, 28 Mar 2001 10:38:06 +0200 > >Hello All! > >We are using Lasertec LYL 305 green Crosslasers for positioning the >patients. We have very often troubles with them. They get weak and 1 = hour >later bright again. And the lifetime is about 1 year although we only >switch >them on while positioning the patient. > >Does anybody have any expirience with this lasers. > >Best wishes > >Christian Knopper >LKH - Klagenfurt >Austria >Christian.Knopper@LKH-klu.at > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SV: Lasertec Lasers Message-ID: From: Eive.Rodestedt@liv.se To: linac-eng@plato1.aristotle.net Subject: SV: Lasertec Lasers Date: Wed, 28 Mar 2001 06:38:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable We use 5 Emerald from Scanditronix on the simulator and they had been working for 3 years now, without any problems. Eive Rodestedt Central Hospital Karlstad Sweden=20 -----Ursprungligt meddelande----- Fr=E5n: roast_em@hotmail.com [mailto:roast_em@hotmail.com] Skickat: = den 28 mars 2001 16:06 Till: linac-eng@plato1.aristotle.net =C4mne: Re: Lasertec Lasers we dont use that brand, but Gammex fair no better. We spent a small = fortune on green lasers and now have gone back to red. They seem to only last = about a year or so and need replaceing,, at twice the purchase price and 1/10 = the life, that gets pretty expensive David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet = gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: "Christian Knopper" >Reply-To: >To: "Newsgroup Linac" <> >Subject: Lasertec Lasers >Date: Wed, 28 Mar 2001 10:38:06 +0200 > >Hello All! > >We are using Lasertec LYL 305 green Crosslasers for positioning the >patients. We have very often troubles with them. They get weak and 1 = hour >later bright again. And the lifetime is about 1 year although we only >switch >them on while positioning the patient. > >Does anybody have any expirience with this lasers. > >Best wishes > >Christian Knopper >LKH - Klagenfurt >Austria >Christian.Knopper@LKH-klu.at > David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet = gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Linac Maintenance position Message-ID: From: Bhudatt Paliwal To: linac-eng@plato1.aristotle.net Subject: Re: Linac Maintenance position Date: Wed, 28 Mar 2001 06:34:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Radiation Therapy Department of the University Hospital I, Madison has an opening for a Linac Engineer. We have 3 Varian, 1 Ximatron, 1 Siemne's CT scanner. We are interested in hiring a full time person to perform routine maintenance. Depending upon the background and experience of the individual competitive salary will be offered, including significant benefit package from the State of WI. Interested individuals are requested to contact Bhudatt Paliwal by phone 608.263.8514 or by email. Some other specifics are given belowL: JOB DESCRIPTION Accelerator Position SUMMARY: Function: Performs advanced technico1 assignments related to the maintenance and operation of accelerators ant other large complex radiation-producing equipment found in a radiation therapy facility. SCOPE: Operates and repairs equipment relating to radiation therapy activities. ESSENTIAL .JOB FUNCTIONS: Troubleshoots to the component level for the repair of radiation therapy accelerators, simulators, CT scanners, cobalt machines, and other equipment related to radiation therapy activities. Assists in isolation of equipment malfunctions to functional circuit or subassembly using knowledge of system functional operation, electronic and mechanical schematic diagrams, and parameter measurements. Reads electronic schematics, solders electronic components, constructs lifting devices, and assembles mechanical, compressed liquid and gas components. MARGINAL OR PERIODIC FUNCTIONS: Designs and fabricates electronic circuitry and mechanical systems. Other duties as required. SUPERVISION: Receives: Works under minimal supervision of a radiation therapy Gives: Supervises activities of graduate students, trainees, physicists and therapists. EDUCATION: Required: Advance accelerator maintenance training and experience EXPERIENCE: Required: Four years of experience troubleshooting and repairing electronics equipment plus three additional years of experience in maintenance ant repair of radiation therapy equipment. With preferred degree, three years of experience troubleshooting and. repairing electronics equipment plus two additional years of experience in maintenance add repair of Radiation Therapy equipment Preferred: Six years experience maintaining radiotherapy equipment., such as linear accelerators. Background in systems management. WORK CONDITIONS: Radiation and high voltage electrical environment. Some night and weekend work. -- ************************************************************** Bhudatt Paliwal, Ph.D. email: paliwal@humonc.wisc.edu Professor Tel: 608.263.8514 Depts. of Medical Physics and Human Oncology Fax: 608.263.9167 Director, Radiation Oncology Physics Web: www.mail.humonc.wisc.edu 600 Highland Ave, Department of Human Oncology K4/B100, CSC Madison, WI 53792 ************************************************************** ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Lasertec Lasers Message-ID: From: David Price To: linac-eng@plato1.aristotle.net Subject: Re: Lasertec Lasers Date: Wed, 28 Mar 2001 05:17:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" we dont use that brand, but Gammex fair no better. We spent a small fortune on green lasers and now have gone back to red. They seem to only last about a year or so and need replaceing,, at twice the purchase price and 1/10 the life, that gets pretty expensive David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: "Christian Knopper" >Reply-To: >To: "Newsgroup Linac" <> >Subject: Lasertec Lasers >Date: Wed, 28 Mar 2001 10:38:06 +0200 > >Hello All! > >We are using Lasertec LYL 305 green Crosslasers for positioning the >patients. We have very often troubles with them. They get weak and 1 hour >later bright again. And the lifetime is about 1 year although we only >switch >them on while positioning the patient. > >Does anybody have any expirience with this lasers. > >Best wishes > >Christian Knopper >LKH - Klagenfurt >Austria >Christian.Knopper@LKH-klu.at > David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Lasertec Lasers Message-ID: From: Christian Knopper Reply-To: Christian.Knopper@LKH-klu.at To: Newsgroup Linac Subject: Lasertec Lasers Date: Wed, 28 Mar 2001 00:38:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All! We are using Lasertec LYL 305 green Crosslasers for positioning the patients. We have very often troubles with them. They get weak and 1 hour later bright again. And the lifetime is about 1 year although we only switch them on while positioning the patient. Does anybody have any expirience with this lasers. Best wishes Christian Knopper LKH - Klagenfurt Austria Christian.Knopper@LKH-klu.at ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Thumb wheel switches. Message-ID: From: "Warren, John" To: "'linac-eng@plato1.aristotle.net'" Subject: Thumb wheel switches. Date: Wed, 28 Mar 2001 00:19:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anybody know of a source for the old style thumbwheel switches used on Philips 75 - 5 machines, made by Contraves AG Zurich, type PB010S0. The Elekta part number is 2432 125 00093. They are now obsolete & Elekta do not have any in stock - I only need two !! Thanks in advance. John ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: KD 2 Jaw A2 Problem Message-ID: <51.966d4a2.27f2846b@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: KD 2 Jaw A2 Problem Date: Tue, 27 Mar 2001 16:03:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks, Just a follow up on the A2 jaw problem listed in the text below. Did a lot of trouble shooting on this problem. Finally changed the 4 Chan V/F converter for the jaws and it took care of the problem. Apparently this problem had been in the machine long before we started taking care of it. The new board that I installed is newer by 2 revisions than the PCB that was in the machine. All of the offset and gain pots are gone now. It is much easier to calibrate the jaw system with the new PCB. Barry Michael Saint Barnabas Health Care System Livingston Technologies 908-238-1231 "Have an interesting problem with Jaw readouts. When the machine is powered up in the morning, we have an A2 jaw fault with the jaw light field showing 12 cm from collimator center and the readout claims it is at 5 cm. At this point you can calibrate the A jaws and it is OK for the rest of the treatment day. Also, you can just power down the machine and bring it back up and move the jaws to a 10x10 field and everything is OK without calibrating the jaw readout. At the end of the treatment day, the night crew leaves the jaw settings for a 10x10 field but jaw A2 moves to the 12 cm setting during the initial power up sequence. We have changed the jaw A pots. Calibration has been done several times. It will be interesting to see the responses for this problem. Thank you in advance for all the help on this one." ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Pulse Cables for 6/100 Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF97E@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Peter E. Vitali'" , Richard Gerler Cc: linac-eng@plato1.aristotle.net Subject: RE: Pulse Cables for 6/100 Date: Tue, 27 Mar 2001 10:30:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good post by Peter as usual. I too have had a despiking network wire fall off, and have run pulses into the despiking resistors for a very short time. I have also seen the gun leads arc and cause mod faults. I believe it is ok to disconnect the gun leads temporarily at the pulse transformer, if the maggie is left on. 6-100 does have the same despiking network as the 4-100. Don't have a magnetron dummy load, but hear that people make them with toaster wire and non-inductive winding pattterns. interesting discussion. > -----Original Message----- > From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] > Sent: Monday, March 26, 2001 10:18 AM > To: Richard Gerler > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Pulse Cables for 6/100 > > Richard: > Many years ago I had a similar problem with a Varian 4X. I thought it was > in the pulse cables since we had had problems with them, but it was the > De-Spiking network. The network had loosened on its mount and one of the > screws was arcing to the frame. This was visible once I started looking > for > something other than the Magnetron or the Pulse Cables. I used two 50 ohm > resistors of about 250 watts (Paralleled to make 25 ohms @ 500 watts) and > made a load to directly terminate the Pulse Cables in. You also need > single strand wire of around 10 gauge rated at around 25kV or higher. > This way > I isolated the PFN and Pulse Cables from the Pulse Transformer and > Magnetron. Don't forget, the Gun is also fed from the Pulse Transformer. > Another > way to do it is to disconnect the De-Spiking Network from the Pulse > Transformer at the De-Spiking Network and pulse the system for very brief > periods > of time (1 to 5 seconds). If you still get mod faults you know for sure > the problem is in the Pulse Cables, the PFN or the Mod Fault Detection > System. You can determine the resistance you need to terminate the Pulse > Cables by using the resistance in the De-Spiking network. In the old 4X > the > De-spiking network was external to the Pulse Transformer which made it > easy to get to. I do not know what they did in the 6X or 6/100 series but > suspect it would be similar to that in the 4X but Varian has changed > components over time in their machines. > > Another resistor to have on hand is one that approximates the value of the > magnetron input resistance. For the 5125 I used a resistor around 470 > ohms. Some where around 250 Watts is a good value. Substituting it for > the magnetron and pulsing it for very short periods of time will let you > know > if your problem is the magnetron and the RF system or the Pulse > Transformer to the PFN > > Hope this helps > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Department of Radiation Physics > Yale-New Haven Hospital > 15 York Street > New Haven, CT. 06504 U.S.A. > Tel: 203 688-2948 > Fax: 203 688-3663 > E-Mail: peter.vitali@yale.edu > > . ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Pulse Cables for 6/100 Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF97B@phsexch6.partners.org> From: "Maddox, Buford J" To: 'Richard Gerler' , linac-eng@plato1.aristotle.net Subject: RE: Pulse Cables for 6/100 Date: Tue, 27 Mar 2001 10:17:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A loose magnet or afc problem can cause this also. Haven't seen a single pulse cable. Are they reliable? Certainly the old RG 8 dual cable system would work if the impedance is still 25 ohms into the pulse xformer. Most of my cable problems were at the ends or at clamps. Years ago there was a company Dielectric Sciences in Burlington, Ma that made a great cable that never failed. Still using these after 15 years. It had an enlarged center wire cor with graphite, and silicon rubber insulation. V stress goes exponentially with the inner core size, and the graphite eliminated air gaps. I made my own ends without the cones, worked better. Carefully and smoothly fold back the shield (no sharp edges) over an O ring, put in plenty of silicon rubber between it and the inner insulation. Use a hose clamp for the shield as before. Silicon rubber elminates air gaps, and lowers the electric field by a factor equal to the dielectric constant, ie, 1 / 2.3. Good luck > -----Original Message----- > From: Richard Gerler [SMTP:rgerler@wpo.it.luc.edu] > Sent: Friday, March 23, 2001 6:20 PM > To: linac-eng@plato1.aristotle.net > Subject: Pulse Cables for 6/100 > > I have a Varian 6/100 s/n 399 that is having intermittent MOD faults. The > magnetron is only one year old. The pulse cable is about four years old. I > inspected the pulse cable and found no apparent problems but "re-positioned" > it throughout the system. The > MOD faults went away for three days then returned. I suspect a faulty pulse > cable. My question is: The system currently has a single pulse cable (Varian > Part # 887792-01) installed in it. Has anyone changed a single pulse cable for > a dual pulse cable, or > vice verse? Any thoughts would be appreciated. > > Richard Gerler > Loyola Univ. Med. Center > Maywood, IL > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Pulse Cables for 6/100 Message-ID: From: Richard Gerler To: linac-eng@plato1.aristotle.net, rgerler@wpo.it.luc.edu Subject: Re: Pulse Cables for 6/100 Date: Mon, 26 Mar 2001 19:43:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just to follow up on our intermittent MOD problems. It turned out that whenever the MOD faults occured that the AFC would oscillate back and forth as displayed on the analog meter. Found this problem to be sample and hold (U15) on the AFC/Time pcb in the console. It would intermittently fail to hold the output constant with the sync pulse and therefore drove the AFC back and forth. This probably caused the magnetron to eventually arc or something. Thanks to all, It is good to know that until second source vendors start carrying the single pulse cables, that I can use a double one in a pinch. >>> "Richard Gerler" 03/23 5:20 PM >>> I have a Varian 6/100 s/n 399 that is having intermittent MOD faults. The magnetron is only one year old. The pulse cable is about four years old. I inspected the pulse cable and found no apparent problems but "re-positioned" it throughout the system. The MOD faults went away for three days then returned. I suspect a faulty pulse cable. My question is: The system currently has a single pulse cable (Varian Part # 887792-01) installed in it. Has anyone changed a single pulse cable for a dual pulse cable, or vice verse? Any thoughts would be appreciated. Richard Gerler Loyola Univ. Med. Center Maywood, IL ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Pulse Cables for 6/100 Message-ID: <3ABF5D84.E22B6D6D@yale.edu> From: "Peter E. Vitali" To: Richard Gerler Cc: linac-eng@plato1.aristotle.net Subject: Re: Pulse Cables for 6/100 Date: Mon, 26 Mar 2001 07:17:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard: Many years ago I had a similar problem with a Varian 4X. I thought it was in the pulse cables since we had had problems with them, but it was the De-Spiking network. The network had loosened on its mount and one of the screws was arcing to the frame. This was visible once I started looking for something other than the Magnetron or the Pulse Cables. I used two 50 ohm resistors of about 250 watts (Paralleled to make 25 ohms @ 500 watts) and made a load to directly terminate the Pulse Cables in. You also need single strand wire of around 10 gauge rated at around 25kV or higher. This way I isolated the PFN and Pulse Cables from the Pulse Transformer and Magnetron. Don't forget, the Gun is also fed from the Pulse Transformer. Another way to do it is to disconnect the De-Spiking Network from the Pulse Transformer at the De-Spiking Network and pulse the system for very brief periods of time (1 to 5 seconds). If you still get mod faults you know for sure the problem is in the Pulse Cables, the PFN or the Mod Fault Detection System. You can determine the resistance you need to terminate the Pulse Cables by using the resistance in the De-Spiking network. In the old 4X the De-spiking network was external to the Pulse Transformer which made it easy to get to. I do not know what they did in the 6X or 6/100 series but suspect it would be similar to that in the 4X but Varian has changed components over time in their machines. Another resistor to have on hand is one that approximates the value of the magnetron input resistance. For the 5125 I used a resistor around 470 ohms. Some where around 250 Watts is a good value. Substituting it for the magnetron and pulsing it for very short periods of time will let you know if your problem is the magnetron and the RF system or the Pulse Transformer to the PFN Hope this helps Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu . ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Old Magnetrons Message-ID: <9D4670F9FFF5D4119BED00508BE22C1D11AF3E@ARTEMIS> From: "Whitlock, Brian" To: "linac eng (E-mail)" Subject: Old Magnetrons Date: Mon, 26 Mar 2001 05:14:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" How are people in the UK currently disposing of their old Magnetrons? We have a small collection here and I am wondering what can be done with them except return to EEV. Brian Whitlock Radiotherapy Physics Poole Hospital Longfleet Road Poole, Dorset. BH15 2JB Tel 01202 448175 email bwhitlock@poole-tr.swest.nhs.uk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re : Elekta SL25 2nd Hand Control Message-ID: From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Cc: Chris Barnardo Subject: Re : Elekta SL25 2nd Hand Control Date: Mon, 26 Mar 2001 03:31:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Chris, Im not familiar with the upgraded Hand Control neither am I familiar with the 2 Hand Control Option but one thing comes in mind is whether you have calibrated the dead-band of the pots on both Hand Controls ? Just an idea... Regards ole Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Pulse Cables for 6/100 Message-ID: <01Mar26.091323bst.118095@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Re: Pulse Cables for 6/100 Date: Mon, 26 Mar 2001 00:16:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, Look carefully at the Mag I waveform as the Mod faults are occuring. If, just before a mod fault, you see a mag I pulse much higher than the normal size it can indicate an arcing maggie. (You have to look carefully and turn the brightness up) If on the other hand you see the mag I pulse going missing, collapsing before it has reached full height or if it looks "eaten away" part way through the pulse, then something is shunting the current away from it and breakdown in pulse cables is certainly a possibility. I would not put my money on the maggie being faulty if it is only 1 year old. If you do see evidence of it arcing, check AFC/tuning/matching conditions 1st. Then again, I have lost money on bets before now......... Hope this helps, Chris Chris Forrest Technical Specialist Medical Physics Service Cookridge Hospital Leeds, UK LS16 6QB Tel +44 113 392 4354 Fax +44 113 392 4122 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Pulse Cables for 6/100 Message-ID: From: "Calvin R. Conn" To: Linac Eng List Subject: Pulse Cables for 6/100 Date: Sun, 25 Mar 2001 20:41:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Richard, I know this is late but here goes. I replaced our single pulse cable for the dual type some time ago and it was very easy to do. Just make sure that you route the cables very carefully through the gantry and that they do not bind through the gantry's full turn radius. Calvin R. Conn cconn@kih.net ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 6/100 Pulse Cables Message-ID: <000951210631D311B91A00A0C9DED0B867ACE8@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: 6/100 Pulse Cables Date: Sun, 25 Mar 2001 15:41:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Richard, I remember the old 6/100's, a good workhorse. I even remember the transition from the old semi-rigid twin triax pulse cables to the later flexable single type. Mod faults ? can be several causes and it is not unknown to lose a magnetron at one year. You can test for failure in either item without too much bother, however as you seem intent on changing the pulse cable I will address this aspect. In the absence of reports on premature failures, the newer style pulse cables are a BIG improvement over the old type. Study and understand how the wind-up cables transit through the gantry to the stand. For additional protection, I have always attached the pulse cable inward on the cable bunch thereby reducing wear and tear to this cable on gantry rotation. Hope this is of assistance. Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. >I have a Varian 6/100 s/n 399 that is having intermittent MOD faults. The magnetron is only >one year old. The pulse cable is about four years old. I inspected the pulse cable and >found no apparent problems but "re-positioned" it throughout the system. The MOD faults >went away for three days then returned. I suspect a faulty pulse cable. My question is: The >system currently has a single pulse cable (Varian Part # 887792-01) installed in it. Has >anyone changed a single pulse cable for a dual pulse cable, or vice verse? Any thoughts >would be appreciated. > >Richard Gerler >Loyola Univ. Med. Center >Maywood, IL ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Pulse Cables for 6/100 Message-ID: From: Richard Gerler To: linac-eng@plato1.aristotle.net Subject: Pulse Cables for 6/100 Date: Fri, 23 Mar 2001 15:20:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a Varian 6/100 s/n 399 that is having intermittent MOD faults. The magnetron is only one year old. The pulse cable is about four years old. I inspected the pulse cable and found no apparent problems but "re-positioned" it throughout the system. The MOD faults went away for three days then returned. I suspect a faulty pulse cable. My question is: The system currently has a single pulse cable (Varian Part # 887792-01) installed in it. Has anyone changed a single pulse cable for a dual pulse cable, or vice verse? Any thoughts would be appreciated. Richard Gerler Loyola Univ. Med. Center Maywood, IL ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ion-chamber of Varian & Siemens Message-ID: <3ABB71DA.C048DBA4@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Ion-chamber of Varian & Siemens Date: Fri, 23 Mar 2001 07:55:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, The backscatter radiation back to ion-chamber from jaws is significant for Varian clinacs at small field sizes. I was told there is no such backscatter in Siemens's . I would like to know is there any "antiscatter plate" between ion-chamber and jaws in Siemens clinac? Could colleagues working on Siemens clinac advise/suggest on this issue? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta SL25 2nd Hand Control Message-ID: <3ABA199A.7ACFB625@scf.sk.ca> From: Chris Barnardo To: "Linac-Engineers, Listserver" Subject: Elekta SL25 2nd Hand Control Date: Thu, 22 Mar 2001 07:26:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an Elekta SL25 serial #5022. We have upgraded to the new RJ45 Connector for the Hand Control, along with the new AI12 A board. Initially we had only one Hand control connected. We are looking at the possibility of connecting a second hand control to the system. On our last software upgrade Elekta gave us the software for 2 Hand Controls, we initially set the 2nd so that it would not give Gant Demand2 Errors. We have now connected the 2nd control. We get all the expected Changes for the Gant Dem2 Item. Also the enable is toggled, but the gantry doesn't move. The push buttons all work for Field, room etc. Has anyone else tried this, or have any suggestions on what has to be set to make this work. Thanks in Advance. -- ------------------------------------------------------ Chris Barnardo Electronics Technologist Saskatoon Cancer Centre Saskatoon, Saskatchewan Canada S7N 4H4 Phone: (306)655-2699 Fax: (306)655-2701 e-mail: cbarnardo@scf.sk.ca ------------------------------------------------------- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: varian 600 c/d yield servo Message-ID: <20010322110559.34656.qmail@web12102.mail.yahoo.com> From: salih bulut To: Nelson Lacsina , Linac-eng@plato1.aristotle.net Subject: Re: varian 600 c/d yield servo Date: Thu, 22 Mar 2001 03:05:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" --- Nelson Lacsina wrote: > Hello all, > I have a situation that hopefully someone on > the list can give me insight on. I have a 600 c/d > that gives me intermittent yield faults...I have > balanced the board and it balances good, but when > the therapists do an EDW treatment it throws a yield > when there is about 9-3 mu's left. It only throws a > yield in EDW and angle is not a commonality. All > other factors are ok. Has anyone experienced this > problem and if so what is your remedy.Any advice or > explanations would be appreciated...Thanks in > advance, Nelson > hello Mr.Nelson I think we encounter a problem like yours. what I did. I adjusted all the parameters.After that,I opened a little bit the copper pipe connection which comes from Gantry AFC Unit Delay line and goes to the Tromboline.I go back and forward and I find an optimum point. I think there is a mismatch in the the system. Also as you know the MAGI must be 9.5V measuring with oscilloscope. Best Rwegards Salih Bulut __________________________________________________ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/ ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: varian 2100C #62 Pressure regulator Message-ID: From: Robert Lindeyer To: linac-eng@plato1.aristotle.net Subject: varian 2100C #62 Pressure regulator Date: Wed, 21 Mar 2001 08:19:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Hello All I have a 2100C #62 version C-1. The pressure regulator for the cooling loop is beginning to malfunction and intermittently restrict water flow to the heat exchanger. The current regulator is a WATTS U5B-3/4. I want to replace it with a regulator that our plumbing department has in stock, a WATTS N35B-3/4. Other than the inline strainer I am not aware of any other differences. ( We have a installed customized water filtration assembly in line ). Both units have the same pressure range. 1. Have any of you actually replaced the regulator with a different model? 2. If so have you experienced any problems? Thanks Robert Lindeyer Clinical Engineer Radiation Oncology Hartford Hospital ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/x-vcard; name="Robert Lindeyer.vcf" Content-Disposition: attachment; filename="Robert Lindeyer.vcf" BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Lindeyer, Robert TEL;WORK:545-4346 ORG:;Medical Physics TEL;PREF;FAX:545-1500 EMAIL;WORK;PREF;NGW:Rlindey N:Lindeyer;Robert TITLE:Engineer X-GWUSERID:Rlindey END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MLC 80 Leaf Carriage Box Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: MLC 80 Leaf Carriage Box Date: Wed, 21 Mar 2001 09:02:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello MLC'ers, I'm looking for a Leaf Carriage Box ( for either Carr A or Carr B ), for an 80 leaf MLC. Is anyone about to throw out an 80 leaf MLC head ? Some of ours are worn such that on the 2nd initialization pass, as the leaves slowly approach the IR Beam, they jitter and cause 100% PWM. We've nursed them along for several monthes using a dry lubricant on the leaf edges and in the groves. I think I can come up with a permanent fix by taking an old leaf Carriage Box and cutting it into 2 pieces horizontally, then milling out the leaf groves and installing groved Delron or Nylon; but need an old Carr.Box to prototype with. Has anyone built a leaf carriage box to replace the Varian cast type ? It would appear cheaper and more serviceable to make them from 2 pieces and then pin and bolt them together (sandwich like), then to make it from one cast and have to cut or broach the leaf grooves through the cast openings. I suspect the one piece approach was taken because of hardening, but if using Delron or similiar inserts the hardening wouldn't be necessary. I'm also interested if others are having trouble with the 2nd pass going to 100% PWM. If I have to come up with a new design, I'd like to be able to share it. David Burgess Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: R-Arm problem Message-ID: <001301c0b193$f35337c0$34c533cf@garyryan> From: Gary Ryan To: Massimo Giovannetti , "linac-eng@plato.aristotle.net" Subject: Re: R-Arm problem Date: Tue, 20 Mar 2001 15:17:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Massimo, Last time I came across the fault of holding down a Motion Button, it was the R-Arm Hand Pendant uP/IR PCB(B4 00667). When you issue a command to the R-Arm (ie. Retract All) the Pendant should continue sending the command until it has been completed. When this Cct. Board starts to fail, you must hold down the button until the motion has finished. I would try replacing this cct. board. Good Luck Gary Ryan Acceletronics ----- Original Message ----- From: "Massimo Giovannetti" To: "linac-eng@plato.aristotle.net" Sent: Tuesday, March 20, 2001 12:07 PM Subject: R-Arm problem > We are having a problem with the R-Arm on our 2100CD 544. What happens, > for instance, is if you want to retract the R-Arm you press the button > as per normal but you will need to keep the button pressed for movement > to continue otherwise it will stop immediately. While you keep the > button pressed the R-Arm moves in steps on all axis' rather than one > smooth motion. You will then get interlocks 4A and 4D indicating that > the Arm is moving in Idle mode. This is what we found: > > The Hand and Lateral PCB had two cooked resistors on the Hand side of > the circuit (R12 and R13) and a welded relay (RE1) indicating a current > problem but the power supply passes all tests. Also IC10 (Hand Driver) > was not working. I traced it back to the Enable II PCB but it checks > out. I even swapped the boards with another R-Arm and problem still > exists. Thinking it might have been a motor problem on this board we > replaced the Hand motor. > > I'm thinking I'm chasing two different problems here. My next option is > to go to the Motion Controller and the CPU PCB. If I find nothing at > these two points I will have ruled out any problem with the Control > Rack. One important detail I almost left out is that it only happens > when using the hand control. It operates as per normal when using the > emergency buttons on the Remote PCB. I suspect it could be the Remote > PCB as well. > > Has anyone had any problems similar to this one? Thanks in advance. > > Massimo Giovannetti > Tom Baker Cancer Centre > Calgary, AB., Canada > massimog@cancerboard.ab.ca > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: R-Arm problem Message-ID: <3AB7A11E.CF708685@CancerBoard.ab.ca> From: Massimo Giovannetti To: yorkej@cbhc.ns.ca, "linac-eng@plato.aristotle.net" Subject: Re: R-Arm problem Date: Tue, 20 Mar 2001 10:27:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hey Jeremy, As far as I know, the lateral motion works while in single motor mode but as far as the others, good question. I ran out of time to really test it any further. That's something I'll have to look at. To set up for calibration I use the emergency buttons instead of the pendant because I get finer movements that way. Jeremy Yorke wrote: > Massimo, > > You had mentioned that it works properly when using the emergency panel, > what about if you put the hand pendant in service mode and move the arm with > the individual thumbwheels?? > > Jeremy > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Massimo > Giovannetti > Sent: Tuesday, March 20, 2001 1:07 PM > To: linac-eng@plato.aristotle.net > Subject: R-Arm problem > > We are having a problem with the R-Arm on our 2100CD 544. What happens, > for instance, is if you want to retract the R-Arm you press the button > as per normal but you will need to keep the button pressed for movement > to continue otherwise it will stop immediately. While you keep the > button pressed the R-Arm moves in steps on all axis' rather than one > smooth motion. You will then get interlocks 4A and 4D indicating that > the Arm is moving in Idle mode. This is what we found: > > The Hand and Lateral PCB had two cooked resistors on the Hand side of > the circuit (R12 and R13) and a welded relay (RE1) indicating a current > problem but the power supply passes all tests. Also IC10 (Hand Driver) > was not working. I traced it back to the Enable II PCB but it checks > out. I even swapped the boards with another R-Arm and problem still > exists. Thinking it might have been a motor problem on this board we > replaced the Hand motor. > > I'm thinking I'm chasing two different problems here. My next option is > to go to the Motion Controller and the CPU PCB. If I find nothing at > these two points I will have ruled out any problem with the Control > Rack. One important detail I almost left out is that it only happens > when using the hand control. It operates as per normal when using the > emergency buttons on the Remote PCB. I suspect it could be the Remote > PCB as well. > > Has anyone had any problems similar to this one? Thanks in advance. > > Massimo Giovannetti > Tom Baker Cancer Centre > Calgary, AB., Canada > massimog@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Ximatron "UnLoad" Problem Message-ID: <8d.3f133fe.27e8fa51@cs.com> From: PilotDaveR@cs.com To: Linac-eng@plato1.aristotle.net Subject: Varian Ximatron "UnLoad" Problem Date: Tue, 20 Mar 2001 10:24:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Fellow Engineers, I have an intermittent problem with a Varian 1987 model Ximatron. Intermittently, the "load, unload" will not work via the hand pendant. I changed the cable and the rubber keypad. I am curious on how this feature works and which PCBs it talks to. Is this a U6 Micro embedded code? Any suggestions would greatly be appreciated. email to: PilotDaveR@cs.com Thanks in Advance David ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: R-Arm problem Message-ID: <3AB79687.E96BBB1E@scf.sk.ca> From: Scot Thiesson To: Massimo Giovannetti Cc: "linac-eng@plato.aristotle.net" Subject: Re: R-Arm problem Date: Tue, 20 Mar 2001 09:42:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The first thing that comes to mind is a recall. If there's garbage in the ROM going to a preset position will cause erratic behaviour. Also check the wires running through the gantry. We have had great fun with the cables causing strange problems. The cable carrying the supervisory signals has a braid that tends to shred and take the internal cable with it. Very interesting because there are no external signs of wear. Massimo Giovannetti wrote: > We are having a problem with the R-Arm on our 2100CD 544. What happens, > for instance, is if you want to retract the R-Arm you press the button > as per normal but you will need to keep the button pressed for movement > to continue otherwise it will stop immediately. While you keep the > button pressed the R-Arm moves in steps on all axis' rather than one > smooth motion. You will then get interlocks 4A and 4D indicating that > the Arm is moving in Idle mode. This is what we found: > > The Hand and Lateral PCB had two cooked resistors on the Hand side of > the circuit (R12 and R13) and a welded relay (RE1) indicating a current > problem but the power supply passes all tests. Also IC10 (Hand Driver) > was not working. I traced it back to the Enable II PCB but it checks > out. I even swapped the boards with another R-Arm and problem still > exists. Thinking it might have been a motor problem on this board we > replaced the Hand motor. > > I'm thinking I'm chasing two different problems here. My next option is > to go to the Motion Controller and the CPU PCB. If I find nothing at > these two points I will have ruled out any problem with the Control > Rack. One important detail I almost left out is that it only happens > when using the hand control. It operates as per normal when using the > emergency buttons on the Remote PCB. I suspect it could be the Remote > PCB as well. > > Has anyone had any problems similar to this one? Thanks in advance. > > Massimo Giovannetti > Tom Baker Cancer Centre > Calgary, AB., Canada > massimog@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: varian 600 c/d yield servo Message-ID: From: Nelson Lacsina To: Linac-eng@plato1.aristotle.net Subject: varian 600 c/d yield servo Date: Tue, 20 Mar 2001 09:30:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I have a situation that hopefully someone on the list can give me insight on. I have a 600 c/d that gives me intermittent yield faults...I have balanced the board and it balances good, but when the therapists do an EDW treatment it throws a yield when there is about 9-3 mu's left. It only throws a yield in EDW and angle is not a commonality. All other factors are ok. Has anyone experienced this problem and if so what is your remedy.Any advice or explanations would be appreciated...Thanks in advance, Nelson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: R-Arm problem Message-ID: <3AB78E3B.9D114784@CancerBoard.ab.ca> From: Massimo Giovannetti To: "linac-eng@plato.aristotle.net" Subject: R-Arm problem Date: Tue, 20 Mar 2001 09:07:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are having a problem with the R-Arm on our 2100CD 544. What happens, for instance, is if you want to retract the R-Arm you press the button as per normal but you will need to keep the button pressed for movement to continue otherwise it will stop immediately. While you keep the button pressed the R-Arm moves in steps on all axis' rather than one smooth motion. You will then get interlocks 4A and 4D indicating that the Arm is moving in Idle mode. This is what we found: The Hand and Lateral PCB had two cooked resistors on the Hand side of the circuit (R12 and R13) and a welded relay (RE1) indicating a current problem but the power supply passes all tests. Also IC10 (Hand Driver) was not working. I traced it back to the Enable II PCB but it checks out. I even swapped the boards with another R-Arm and problem still exists. Thinking it might have been a motor problem on this board we replaced the Hand motor. I'm thinking I'm chasing two different problems here. My next option is to go to the Motion Controller and the CPU PCB. If I find nothing at these two points I will have ruled out any problem with the Control Rack. One important detail I almost left out is that it only happens when using the hand control. It operates as per normal when using the emergency buttons on the Remote PCB. I suspect it could be the Remote PCB as well. Has anyone had any problems similar to this one? Thanks in advance. Massimo Giovannetti Tom Baker Cancer Centre Calgary, AB., Canada massimog@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Open Positions Message-ID: <001401c0b0cd$01dfc3c0$020488ac@bill> From: Resumes Reply-To: Resumes To: linac-eng@plato1.aristotle.net Subject: Open Positions Date: Mon, 19 Mar 2001 15:33:29 -0800 Importance: high X-Priority: 1 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thank You to Everyone who supported New Careers previously! I am working very hard to earn and keep the respect of everyone on this list. Your support is priceless to me. If you have questions, please do not hesitate to call me. I welcome your ideas and input. Again, those of you whom I offended, I offer my Apologies!! """New Careers Inc.""" currently has an IMMEDIATE need for "14" OEM trained Linac Engineers (Varian & Siemens) with 5+ years of experience for positions throughout the entire East Coast and "4" positions in the Ohio, Kentucky & Arkansas areas. Secrecy Guaranteed! note: This need is urgent, otherwise I will not clutter the list with repeated postings. I will try to keep my postings to <1/ month Respectfully Yours, We are currently updating our website with Job information, we hope to have this available nlt 032501. Billy Barnes New Careers Inc. 610-495-1729 voice & fax 610-213-0937 cell & pager bbarnes@NewCareersInc.com www.NewCareersInc.Com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: GE Paint Message-ID: From: Neil Johnston To: linac-eng@plato1.aristotle.net Subject: GE Paint Date: Mon, 19 Mar 2001 13:20:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Can anybody help me get a paint code for a GE CT. I called GE and they gave me HOC-GE-GREY#1 but I can't cross it to a standard paint. Thanks Neil ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/x-vcard; name="Neil Johnston.vcf" Content-Disposition: attachment; filename="Neil Johnston.vcf" BEGIN:VCARD VERSION:2.1 N:Johnston;Neil FN:Neil Johnston ORG:LAP of America, LC TEL;WORK;VOICE:5614169250 TEL;WORK;FAX:5614169263 ADR;WORK:;;1755 Avenida Del Sol;Boca Raton;FL;33432;USA LABEL;WORK;ENCODING=QUOTED-PRINTABLE:1755 Avenida Del Sol=0D=0ABoca Raton, FL 33432=0D=0AUSA URL: URL:http://www.lap-laser.com EMAIL;PREF;INTERNET:naj@lap-laser.com REV:20001206T153203Z END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian vacuum readings. Message-ID: <3AB2E705.F1A32327@rconnect.com> From: Paul Miller To: "Caunt, Peter" Cc: "'linac-eng@plato1.aristotle.net'" Subject: Re: Varian vacuum readings. Date: Fri, 16 Mar 2001 20:24:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" When checking the pump KV at the pump connector, check to see what the current reading is and do the math. it's a good idea to check during PMI's and make sure the meter/fault circuit is working "Caunt, Peter" wrote: > Hello members, > Seeking help for information now forgotten. > > What is the conversion factor between Varian service mode vacuum readings > and real vac-ion current values i.e. -> ACL VAC. > -> GUN VAC. > > Many thanks, > > Peter Caunt > Radiation Oncology > The Canberra Hospital > Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC parts Message-ID: From: David Burgess To: kimyeung@netvigator.com, Linac-Eng@plato1.aristotle.net Subject: Re: Varian MLC parts Date: Fri, 16 Mar 2001 10:37:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Kim, The leaf motors are available from Faulhaber Motoren, Germany.The minium order is 25 and that will cost you about $1000 CAN. But the motors you receive have a single ended spindle and you have to replace it with the double ended spindle from a used motor, as you need one end for the encoder and the other end for the gearbox. So take the old motor apart ( heat gun helps melt the glue), press out the spindle and re-use it in the new motor. Then re-attach the gearbox and the encoder. The part which fails most often is the motors brushes ( actually wire like fingers that run on the comutator). There is a grease like paste on it and carbon builds up until the concentration is high enough to conduct. At that time the motor circuit goes into current limit at about 28MA. We have been suscessful at drilling two holes in the motor shell and flushing away the grease & carbon, for a little more life out of the motor. Eventually the commutator wears deep grooves causing the wire like brushes to bounce. We re-built some MLC leaf motors and have put the project on hold for now. I've recently found another manufacturer whom can supply the double ended spindle motor. I'm hoping to get a student this summer and finialize the method. We comsume 1 motor a week average, and that cost is too high, so we will come up with an alternate, but just don't have the time to spend on it now. Best regards David Burgess Nova Scotia Cancer Centre >>> "kimyeung@ultraline" 3/16/2001 8:44:13 AM >>> Hi Colleagues, Could anyone advise the sources of Varian MLC motor and secondary feedback brush? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian vacuum readings. Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "'linac-eng@plato1.aristotle.net'" , Tim Cullen Subject: Re: Varian vacuum readings. Date: Fri, 16 Mar 2001 08:39:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Assuming a high energy CD machine and accelerator is being measured: 1 mA=100% -- On Thu, 15 Mar 2001 17:46:39 Tim Cullen wrote: >Peter, I think the best reference for this is your system test summary from >Varian. You can look at what they set it up at during final testing. I seem >to remember these being more like a percent meter. In other words whatever >the VAC 1 I/L is set at would be 100% or more like 99.99%. These meters all >have a gain and offset setting, which more than likely has been tampered with >since the final testing. I personally don't put a whole lot of stock in them >except for comparison to what it is versus what it was. Or when you come in >and there's no output at all, first thing I look at is the Gun I analog >meter, if there's nothing there in 6MV, then you start hoping it's only a >fuse. > > >"Caunt, Peter" wrote: > >> Hello members, >> Seeking help for information now forgotten. >> >> What is the conversion factor between Varian service mode vacuum readings >> and real vac-ion current values i.e. -> ACL VAC. >> -> GUN VAC. >> >> Many thanks, >> >> Peter Caunt >> Radiation Oncology >> The Canberra Hospital >> Canberra, Australia. > > Get 250 color business cards for FREE! at Lycos Mail http://mail.lycos.com/freemail/vistaprint_index.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC parts Message-ID: <3AB24AB6.4F7F2E04@wfubmc.edu> From: tcullen@wfubmc.edu To: Linac-Eng@plato1.aristotle.net Subject: Re: Varian MLC parts Date: Fri, 16 Mar 2001 09:17:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I believe if you tear one of these apart you'd find a three piece assembly: gear reduction, motor, and encoder. If you wanted to get real frugal maybe you could press these out of the sleeve and just replace the bad part, which in a lot of cases I'd bet is the encoder. Good luck finding that. The motor is probably made somewhere other than the US and like Marty said, is readily available, if you want several thousand. I've even run into this with less exotic parts from vendors like Newark Electronics. TGIF MARTIN SHAPIRO wrote: > Actually there is really nothing proprietary about the mlc motors except > maybe some Varian drawings. The motors can be ordered to the exact same > specs. The only problem is that the motor manufacturers prefer to deal in > 10,000 piece orders in order to get good pricing. At that level the price > per motor may be as low as $100. Thats one heck of an investment! Especially > when you consider that there are a number of different motors, > configurations (52,80,120 leaf) and manufacturers. > Still it would be nice to have some less expensive alternatives as the > Varian dynamic multileaf sure chews up the motors. > > Marty Shapiro > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Richard > Kimball > Sent: Friday, March 16, 2001 8:59 AM > To: kimyeung@ultraline; Linac-Eng@plato1.aristotle.net > Subject: Re: Varian MLC parts > > Kim, > Last I knew, a proprietary agreement between manufacturer and Varian > prohibited the sale to end users. > Rich Kimball > > ----- Original Message ----- > From: "kimyeung@ultraline" > To: > Sent: Friday, March 16, 2001 6:44 AM > Subject: Re: Varian MLC parts > > > Hi Colleagues, > > > > Could anyone advise the sources of Varian MLC motor and secondary > > feedback brush? > > > > Thanks in advance. > > > > Kim Yeung > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC parts Message-ID: <004b01c0ae31$96ee3d00$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: Linac-Eng@plato1.aristotle.net Subject: RE: Varian MLC parts Date: Fri, 16 Mar 2001 07:55:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Actually there is really nothing proprietary about the mlc motors except maybe some Varian drawings. The motors can be ordered to the exact same specs. The only problem is that the motor manufacturers prefer to deal in 10,000 piece orders in order to get good pricing. At that level the price per motor may be as low as $100. Thats one heck of an investment! Especially when you consider that there are a number of different motors, configurations (52,80,120 leaf) and manufacturers. Still it would be nice to have some less expensive alternatives as the Varian dynamic multileaf sure chews up the motors. Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Richard Kimball Sent: Friday, March 16, 2001 8:59 AM To: kimyeung@ultraline; Linac-Eng@plato1.aristotle.net Subject: Re: Varian MLC parts Kim, Last I knew, a proprietary agreement between manufacturer and Varian prohibited the sale to end users. Rich Kimball ----- Original Message ----- From: "kimyeung@ultraline" To: Sent: Friday, March 16, 2001 6:44 AM Subject: Re: Varian MLC parts > Hi Colleagues, > > Could anyone advise the sources of Varian MLC motor and secondary > feedback brush? > > Thanks in advance. > > Kim Yeung > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC parts Message-ID: <000701c0ae21$3ac02a80$0100a8c0@mshome.net> From: Richard Kimball To: "kimyeung@ultraline" , Linac-Eng@plato1.aristotle.net Subject: Re: Varian MLC parts Date: Fri, 16 Mar 2001 05:58:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kim, Last I knew, a proprietary agreement between manufacturer and Varian prohibited the sale to end users. Rich Kimball ----- Original Message ----- From: "kimyeung@ultraline" To: Sent: Friday, March 16, 2001 6:44 AM Subject: Re: Varian MLC parts > Hi Colleagues, > > Could anyone advise the sources of Varian MLC motor and secondary > feedback brush? > > Thanks in advance. > > Kim Yeung > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC parts Message-ID: <3AB20A9C.F7316157@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Varian MLC parts Date: Fri, 16 Mar 2001 04:44:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, Could anyone advise the sources of Varian MLC motor and secondary feedback brush? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: CL-18R UNDR Message-ID: <3AB1474A.2EC88F5B@wfubmc.edu> From: tcullen@wfubmc.edu To: linac-eng@plato1.aristotle.net Subject: Re: CL-18R UNDR Date: Thu, 15 Mar 2001 14:50:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chris, based on what you said it's not clear that you have tried adjusting the gun I, PFN, or AFC to improve the dose rate. Chris Coyle wrote: > I have a Varian Clinac 18R (1800) that is slow to reach output (325 MU/) in 12 electrons only. All other energies work fine. No change in Kylstron, Gun or AFC can be seen. > Any ideas ?? > > Chris Coyle > Swedish Tumor Inst > Seattle, WA. > 206.215.3963 > chris.coyle@swedish.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian vacuum readings. Message-ID: <3AB1464F.54ECB30C@wfubmc.edu> From: tcullen@wfubmc.edu To: "'linac-eng@plato1.aristotle.net'" Subject: Re: Varian vacuum readings. Date: Thu, 15 Mar 2001 14:46:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter, I think the best reference for this is your system test summary from Varian. You can look at what they set it up at during final testing. I seem to remember these being more like a percent meter. In other words whatever the VAC 1 I/L is set at would be 100% or more like 99.99%. These meters all have a gain and offset setting, which more than likely has been tampered with since the final testing. I personally don't put a whole lot of stock in them except for comparison to what it is versus what it was. Or when you come in and there's no output at all, first thing I look at is the Gun I analog meter, if there's nothing there in 6MV, then you start hoping it's only a fuse. "Caunt, Peter" wrote: > Hello members, > Seeking help for information now forgotten. > > What is the conversion factor between Varian service mode vacuum readings > and real vac-ion current values i.e. -> ACL VAC. > -> GUN VAC. > > Many thanks, > > Peter Caunt > Radiation Oncology > The Canberra Hospital > Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: CL-18R UNDR Message-ID: From: Chris Coyle To: linac-eng@plato1.aristotle.net Subject: CL-18R UNDR Date: Thu, 15 Mar 2001 07:49:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a Varian Clinac 18R (1800) that is slow to reach output (325 MU/) in 12 electrons only. All other energies work fine. No change in Kylstron, Gun or AFC can be seen. Any ideas ?? Chris Coyle Swedish Tumor Inst Seattle, WA. 206.215.3963 chris.coyle@swedish.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Diod-array Message-ID: <001001c0ad4e$77aaa3e0$95c6d6d8@mshome.net> From: Richard Kimball To: Borje.Blad@skane.se, linac-eng@plato1.aristotle.net Subject: Re: Diod-array Date: Thu, 15 Mar 2001 04:50:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Borje, The unit "Profiler" manufactured by Sun Nuclear is an excellent device. It is limited to a 22.5cm field however. http://www.sunnuclear.com/Profiler.html Richard ----- Original Message ----- From: To: Sent: Thursday, March 15, 2001 1:45 AM Subject: Diod-array > Hello Members > > We are in the process of buying a profile test device for linear accelerators. At the moment we use an old version of diode array (BMS-96) from Schuster. What are you using and what similar systems are available on the market? > > > Borje Blad > Department of Radiation Physics > University Hospital > Lund, Sweden > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Filmholder Message-ID: <4d6c186696837a37f1a0b37b4dad61563ab0a975@mkoc.demon.co.uk> From: David Fenn To: linac-eng@plato1.aristotle.net Subject: Filmholder Date: Thu, 15 Mar 2001 03:43:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi everyone! Has anyone got, for sale, a Heustis Flexiholder type FH303 that they no longer require? A UK source would be preferable obviously, but we would be willing to pay carriage charges! Thanks in advance David Fenn Kent Oncology Centre Maidstone Kent UK ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Diod-array Message-ID: <"/GUID:Q68Yy7WVFCUCZ/nYovo4ehg*/G=borje/S=blad/OU=radf/O=lund/PRMD=skane/ADMD=400net/C=se/"@MHS> From: Borje.Blad@skane.se To: linac-eng@plato1.aristotle.net Subject: Diod-array Date: Wed, 14 Mar 2001 23:45:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Members We are in the process of buying a profile test device for linear accelerators. At the moment we use an old version of diode array (BMS-96) from Schuster. What are you using and what similar systems are available on the market? Borje Blad Department of Radiation Physics University Hospital Lund, Sweden ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian vacuum readings. Message-ID: <000951210631D311B91A00A0C9DED0B867ACE3@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'linac-eng@plato1.aristotle.net'" Subject: Varian vacuum readings. Date: Wed, 14 Mar 2001 21:14:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello members, Seeking help for information now forgotten. What is the conversion factor between Varian service mode vacuum readings and real vac-ion current values i.e. -> ACL VAC. -> GUN VAC. Many thanks, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Salary Message-ID: <000201c0acad$44b29d90$630109c0@accuray.com> From: John Somers Reply-To: jsomers@accuray.com To: 'Billy Barnes' , linac-eng@plato1.aristotle.net Subject: RE: Salary Date: Wed, 14 Mar 2001 09:36:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" That's great, but I think the results should be presented with some location segmentation. I can tell you for sure that $69.4K per year in the San Francisco Bay area will not support the same lifestyle or family needs as $69.4K in Houston. Same is true for Boston vs. Iowa, NYC vs. Tucson, etc. The way I've seen this done is to generate averages for certain identifiable geographic/urban area. John Somers -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Billy Barnes Sent: Wednesday, March 14, 2001 7:36 AM To: linac-eng@plato1.aristotle.net Subject: Salary Hello Everyone, Thank You! I have had an excellent response to my previous postings, with lots of support for the service New Careers provides. Since some people questioned my salary levels. I have decided to post the following information to clarify my statements. My stats came from questions that I had asked most of the senior people (14+ years experience), in this business that I know( 14 engineers), and that was an average of the salary information that I gathered from them. I have also talked with 32 engineers that I currently have information on, their average experience level was 8.3 years, and the average salary level was $69.4k per year. 72 % are hourly, and 84% of the hourly people received overtime. I would like to do a Very thorough Salary Survey. I know that other people have done one on here before, but I have never seen the results posted (not in the past 2 years). If the list server is interested, please respond with your experience level, salary or hourly, amount paid and any other information deemed appropriate. You do not have to provide ANY other information, unless you want to. For those who think I am just trying to generate leads from this, then they can collect the data, compile and publish the results. Or I will do it if the list wants me to. I don't care, but I think the rising need for Linac Engineers will show a corresponding increase in salary levels. I know that I currently have more jobs available than people to fill them, and that seems to be the same with other recruiters and employers, with whom I have spoken. If anyone wishes to discuss this privately, email me and I will be happy to talk it over with you. Billy Barnes New Careers Inc. 610-495-1729 voice & fax bbarnes@NewCareersInc.com www.NewCareersInc.Com """The information disclosed here is strictly the opinion of New Careers Inc. and not that of any other group, company, or entity.""" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Salary Message-ID: <001501c0ac9c$8b1a34c0$fdee81ac@bill> From: Billy Barnes Reply-To: Billy Barnes To: linac-eng@plato1.aristotle.net Subject: Salary Date: Wed, 14 Mar 2001 07:36:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone, Thank You! I have had an excellent response to my previous postings, with lots of support for the service New Careers provides. Since some people questioned my salary levels. I have decided to post the following information to clarify my statements. My stats came from questions that I had asked most of the senior people (14+ years experience), in this business that I know( 14 engineers), and that was an average of the salary information that I gathered from them. I have also talked with 32 engineers that I currently have information on, their average experience level was 8.3 years, and the average salary level was $69.4k per year. 72 % are hourly, and 84% of the hourly people received overtime. I would like to do a Very thorough Salary Survey. I know that other people have done one on here before, but I have never seen the results posted (not in the past 2 years). If the list server is interested, please respond with your experience level, salary or hourly, amount paid and any other information deemed appropriate. You do not have to provide ANY other information, unless you want to. For those who think I am just trying to generate leads from this, then they can collect the data, compile and publish the results. Or I will do it if the list wants me to. I don't care, but I think the rising need for Linac Engineers will show a corresponding increase in salary levels. I know that I currently have more jobs available than people to fill them, and that seems to be the same with other recruiters and employers, with whom I have spoken. If anyone wishes to discuss this privately, email me and I will be happy to talk it over with you. Billy Barnes New Careers Inc. 610-495-1729 voice & fax bbarnes@NewCareersInc.com www.NewCareersInc.Com """The information disclosed here is strictly the opinion of New Careers Inc. and not that of any other group, company, or entity.""" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Salary Message-ID: <001501c0ac9c$8b1a34c0$fdee81ac@bill> From: Billy Barnes Reply-To: Billy Barnes To: linac-eng@plato1.aristotle.net Subject: Salary Date: Wed, 14 Mar 2001 07:36:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Everyone, Thank You! I have had an excellent response to my previous postings, with lots of support for the service New Careers provides. Since some people questioned my salary levels. I have decided to post the following information to clarify my statements. My stats came from questions that I had asked most of the senior people (14+ years experience), in this business that I know( 14 engineers), and that was an average of the salary information that I gathered from them. I have also talked with 32 engineers that I currently have information on, their average experience level was 8.3 years, and the average salary level was $69.4k per year. 72 % are hourly, and 84% of the hourly people received overtime. I would like to do a Very thorough Salary Survey. I know that other people have done one on here before, but I have never seen the results posted (not in the past 2 years). If the list server is interested, please respond with your experience level, salary or hourly, amount paid and any other information deemed appropriate. You do not have to provide ANY other information, unless you want to. For those who think I am just trying to generate leads from this, then they can collect the data, compile and publish the results. Or I will do it if the list wants me to. I don't care, but I think the rising need for Linac Engineers will show a corresponding increase in salary levels. I know that I currently have more jobs available than people to fill them, and that seems to be the same with other recruiters and employers, with whom I have spoken. If anyone wishes to discuss this privately, email me and I will be happy to talk it over with you. Billy Barnes New Careers Inc. 610-495-1729 voice & fax bbarnes@NewCareersInc.com www.NewCareersInc.Com """The information disclosed here is strictly the opinion of New Careers Inc. and not that of any other group, company, or entity.""" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Position open at Univ of Iowa Hospital Message-ID: From: "Schebler, Joe" To: "'linac-eng@plato1.aristotle.net'" Cc: "Owen, Dave" Subject: Position open at Univ of Iowa Hospital Date: Wed, 14 Mar 2001 05:16:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, We now have an opening, the job will be servicing our Radiation Oncology, Nuclear Medicine and Ultrasound departments. Both 1st and 2nd shift shall be rotated through, there is two others in this position, and weekend call about once a quarter. Two major job benefits, are two to one matching in the retirement fund and starting 5 weeks vacation. Anyone know of anybody interested, please reply. Joe Schebler joe-schebler@uiowa.edu 319 356-3376 Phone 319 353-6769 Fax ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Position open at Univ of Iowa Hospital Message-ID: From: "Schebler, Joe" To: "'linac-eng@plato1.aristotle.net'" Cc: "Owen, Dave" Subject: Position open at Univ of Iowa Hospital Date: Wed, 14 Mar 2001 05:16:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, We now have an opening, the job will be servicing our Radiation Oncology, Nuclear Medicine and Ultrasound departments. Both 1st and 2nd shift shall be rotated through, there is two others in this position, and weekend call about once a quarter. Two major job benefits, are two to one matching in the retirement fund and starting 5 weeks vacation. Anyone know of anybody interested, please reply. Joe Schebler joe-schebler@uiowa.edu 319 356-3376 Phone 319 353-6769 Fax ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotation - Thanks Message-ID: <9C688FB52A05D51194750002B325B5F714F606@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotation - Thanks Date: Tue, 13 Mar 2001 07:25:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to extend my thanks for all of the excellent responses I received on this topic. We are (when time permits) going to take a more extensive look at this problem using the information provided. Thanks Again Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotation - Thanks Message-ID: <9C688FB52A05D51194750002B325B5F714F606@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotation - Thanks Date: Tue, 13 Mar 2001 07:25:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to extend my thanks for all of the excellent responses I received on this topic. We are (when time permits) going to take a more extensive look at this problem using the information provided. Thanks Again Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotation - Thanks Message-ID: <9C688FB52A05D51194750002B325B5F714F606@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotation - Thanks Date: Tue, 13 Mar 2001 07:25:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to extend my thanks for all of the excellent responses I received on this topic. We are (when time permits) going to take a more extensive look at this problem using the information provided. Thanks Again Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: From: Randy Reply-To: randy@radparts.com To: "Lapenna, Russ" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Tue, 13 Mar 2001 06:26:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Not sure what vintage C-Series machine you have, but I do recall a mandatory modification from Varian concerning the ETR Turntable Rotation Bearing. This occured quite some time ago (early 90's) due to a problem with the existing turntable bearing. Pretty straight forward as far as replacement. Good luck, Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 11:15 AM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: From: Randy Reply-To: randy@radparts.com To: "Lapenna, Russ" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Tue, 13 Mar 2001 06:26:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Not sure what vintage C-Series machine you have, but I do recall a mandatory modification from Varian concerning the ETR Turntable Rotation Bearing. This occured quite some time ago (early 90's) due to a problem with the existing turntable bearing. Pretty straight forward as far as replacement. Good luck, Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 11:15 AM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: From: Randy Reply-To: randy@radparts.com To: "Lapenna, Russ" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Tue, 13 Mar 2001 06:26:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Not sure what vintage C-Series machine you have, but I do recall a mandatory modification from Varian concerning the ETR Turntable Rotation Bearing. This occured quite some time ago (early 90's) due to a problem with the existing turntable bearing. Pretty straight forward as far as replacement. Good luck, Randy, Dee, Jeff The Radparts Guys We accept credit cards, echecks, wire tranfers and purchase orders. You can search our online database at http://www.radparts.com or contact us Toll Free: 877-704-3838. Been offered a lower price? Contact us and we will do our absolute best to beat that price as long as it's not below our cost. -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 11:15 AM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <001e01c0ab85$0d111fc0$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 22:15:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Given the large amount of run out in the table isocenter I'm guessing that this is a VEO baseframe. (the turntable is about 4ft across and not made of metal). If so then you need to re-level the rail on which the table rotates. This requires a precision level and very careful adjustment of the jacking bolts that hold the ring down. Be very careful to only make small adjustments so you don't break the casting. It also helps to loosen the lock down bolts on either side of the two you are adjusting. With careful adjustment you should be able to get the table run out to less than 1mm diameter. One note, I understand that a significant number of the VEO baseframes may have shipped with soft bolts (no QC) holding down the spacers. I have been told that many of these have broken with little or no use with the same effect as you are experiencing. As these bolts come up from underneath, the concrete side, this type of failure is more difficult to fix. I understand that Varian has a field fix for this mode of failure. Oh yeah, if you think some of your bolts may have broken, loosen the lock down bolt (the center bolt) and try to loosen the spacer from the bottom bolt (30mm open end wrench). Don't try to tighten the spacers as you may well break the bottom bolts then. Good luck! Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 12:15 PM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <001e01c0ab85$0d111fc0$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 22:15:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Given the large amount of run out in the table isocenter I'm guessing that this is a VEO baseframe. (the turntable is about 4ft across and not made of metal). If so then you need to re-level the rail on which the table rotates. This requires a precision level and very careful adjustment of the jacking bolts that hold the ring down. Be very careful to only make small adjustments so you don't break the casting. It also helps to loosen the lock down bolts on either side of the two you are adjusting. With careful adjustment you should be able to get the table run out to less than 1mm diameter. One note, I understand that a significant number of the VEO baseframes may have shipped with soft bolts (no QC) holding down the spacers. I have been told that many of these have broken with little or no use with the same effect as you are experiencing. As these bolts come up from underneath, the concrete side, this type of failure is more difficult to fix. I understand that Varian has a field fix for this mode of failure. Oh yeah, if you think some of your bolts may have broken, loosen the lock down bolt (the center bolt) and try to loosen the spacer from the bottom bolt (30mm open end wrench). Don't try to tighten the spacers as you may well break the bottom bolts then. Good luck! Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 12:15 PM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <001e01c0ab85$0d111fc0$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 22:15:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, Given the large amount of run out in the table isocenter I'm guessing that this is a VEO baseframe. (the turntable is about 4ft across and not made of metal). If so then you need to re-level the rail on which the table rotates. This requires a precision level and very careful adjustment of the jacking bolts that hold the ring down. Be very careful to only make small adjustments so you don't break the casting. It also helps to loosen the lock down bolts on either side of the two you are adjusting. With careful adjustment you should be able to get the table run out to less than 1mm diameter. One note, I understand that a significant number of the VEO baseframes may have shipped with soft bolts (no QC) holding down the spacers. I have been told that many of these have broken with little or no use with the same effect as you are experiencing. As these bolts come up from underneath, the concrete side, this type of failure is more difficult to fix. I understand that Varian has a field fix for this mode of failure. Oh yeah, if you think some of your bolts may have broken, loosen the lock down bolt (the center bolt) and try to loosen the spacer from the bottom bolt (30mm open end wrench). Don't try to tighten the spacers as you may well break the bottom bolts then. Good luck! Marty Shapiro -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Lapenna, Russ Sent: Monday, March 12, 2001 12:15 PM To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE:Varian Couch Rotational Walkout Message-ID: <01C0AB09.1EDE14A0.cconn@kih.net> From: "Calvin R. Conn" Reply-To: cconn@kih.net To: "'linac-eng@plato1.aristotle.net'" Subject: RE:Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 12:27:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Russ, We had the same thing here. We ended up moving the isocenter of the gantry to match the table, by using a couple of porta-power jacks we shifted the gantry. We also had a couble of Varian engineers to guide us in doing this, it is very easy to get the whole gantry out of whack. You can check the table using a different reference than the gantry to see if the table is actually shifting. You have to set up some form of stand to hold a reference circular object and use a micrometer on the table to check for any variation. I haven't heard of any table being out, but, I guess anything could happen. Good Luck Calvin R. Conn cconn@kih.net ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE:Varian Couch Rotational Walkout Message-ID: <01C0AB09.1EDE14A0.cconn@kih.net> From: "Calvin R. Conn" Reply-To: cconn@kih.net To: "'linac-eng@plato1.aristotle.net'" Subject: RE:Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 12:27:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Russ, We had the same thing here. We ended up moving the isocenter of the gantry to match the table, by using a couple of porta-power jacks we shifted the gantry. We also had a couble of Varian engineers to guide us in doing this, it is very easy to get the whole gantry out of whack. You can check the table using a different reference than the gantry to see if the table is actually shifting. You have to set up some form of stand to hold a reference circular object and use a micrometer on the table to check for any variation. I haven't heard of any table being out, but, I guess anything could happen. Good Luck Calvin R. Conn cconn@kih.net ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE:Varian Couch Rotational Walkout Message-ID: <01C0AB09.1EDE14A0.cconn@kih.net> From: "Calvin R. Conn" Reply-To: cconn@kih.net To: "'linac-eng@plato1.aristotle.net'" Subject: RE:Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 12:27:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Russ, We had the same thing here. We ended up moving the isocenter of the gantry to match the table, by using a couple of porta-power jacks we shifted the gantry. We also had a couble of Varian engineers to guide us in doing this, it is very easy to get the whole gantry out of whack. You can check the table using a different reference than the gantry to see if the table is actually shifting. You have to set up some form of stand to hold a reference circular object and use a micrometer on the table to check for any variation. I haven't heard of any table being out, but, I guess anything could happen. Good Luck Calvin R. Conn cconn@kih.net ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF975@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 10:36:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an old 6-100 with a similar runout. It appears to be a tilt in the scissors, rather than a bearing problem. try dropping a plumb bob to the bearing and check the runout there. Interested in your results. Haven't seen this in the newer ETR types yet. The VEO base is very good. We have a Special stereotactic VEO, with two bearings, that is near perfect after 9 years. Experiences of others? > -----Original Message----- > From: Lapenna, Russ [SMTP:Russ.Lapenna@hrcc.on.ca] > Sent: Monday, March 12, 2001 12:15 PM > To: 'LINAC-ENG' > Subject: Varian Couch Rotational Walkout > > > I'm curious if anyone has experienced a form of slop in the > rotational motion of a Varian linac couch. We have two machines that if you > mark your isocentre with the couch at zero degrees, and then rotate 90 > degrees in either direction the isocentre has moved (sometimes as much as > 4mm). We have eliminated any slop in the couch top when checking this and > still get the same result. If anyone has experienced this and knows of > anything that can be tightened or how to replace/rebuild the bearing we > would be quite interested to hear about it. > > Thanks > > Russ LaPenna > Electronics Engineering Technologist > Medical Physics Department > Hamilton Regional Cancer Centre > 699 Concession St. > Hamilton, Ontario > Canada > L8V 5C2 > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF975@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 10:36:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an old 6-100 with a similar runout. It appears to be a tilt in the scissors, rather than a bearing problem. try dropping a plumb bob to the bearing and check the runout there. Interested in your results. Haven't seen this in the newer ETR types yet. The VEO base is very good. We have a Special stereotactic VEO, with two bearings, that is near perfect after 9 years. Experiences of others? > -----Original Message----- > From: Lapenna, Russ [SMTP:Russ.Lapenna@hrcc.on.ca] > Sent: Monday, March 12, 2001 12:15 PM > To: 'LINAC-ENG' > Subject: Varian Couch Rotational Walkout > > > I'm curious if anyone has experienced a form of slop in the > rotational motion of a Varian linac couch. We have two machines that if you > mark your isocentre with the couch at zero degrees, and then rotate 90 > degrees in either direction the isocentre has moved (sometimes as much as > 4mm). We have eliminated any slop in the couch top when checking this and > still get the same result. If anyone has experienced this and knows of > anything that can be tightened or how to replace/rebuild the bearing we > would be quite interested to hear about it. > > Thanks > > Russ LaPenna > Electronics Engineering Technologist > Medical Physics Department > Hamilton Regional Cancer Centre > 699 Concession St. > Hamilton, Ontario > Canada > L8V 5C2 > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian Couch Rotational Walkout Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF975@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Lapenna, Russ'" , 'LINAC-ENG' Subject: RE: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 10:36:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an old 6-100 with a similar runout. It appears to be a tilt in the scissors, rather than a bearing problem. try dropping a plumb bob to the bearing and check the runout there. Interested in your results. Haven't seen this in the newer ETR types yet. The VEO base is very good. We have a Special stereotactic VEO, with two bearings, that is near perfect after 9 years. Experiences of others? > -----Original Message----- > From: Lapenna, Russ [SMTP:Russ.Lapenna@hrcc.on.ca] > Sent: Monday, March 12, 2001 12:15 PM > To: 'LINAC-ENG' > Subject: Varian Couch Rotational Walkout > > > I'm curious if anyone has experienced a form of slop in the > rotational motion of a Varian linac couch. We have two machines that if you > mark your isocentre with the couch at zero degrees, and then rotate 90 > degrees in either direction the isocentre has moved (sometimes as much as > 4mm). We have eliminated any slop in the couch top when checking this and > still get the same result. If anyone has experienced this and knows of > anything that can be tightened or how to replace/rebuild the bearing we > would be quite interested to hear about it. > > Thanks > > Russ LaPenna > Electronics Engineering Technologist > Medical Physics Department > Hamilton Regional Cancer Centre > 699 Concession St. > Hamilton, Ontario > Canada > L8V 5C2 > (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Couch Rotational Walkout Message-ID: <38.132d2277.27de668f@cs.com> From: PilotDaveR@cs.com To: Russ.Lapenna@hrcc.on.ca, linac-eng@plato1.aristotle.net Subject: Re: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:51:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, my experience is that the table isocenter and gantry isocenter do not match. I had to move the gantry iso. to minimize the couch isocenter. Split the difference. The gantry can be moved by the four mounting bolts where it meets the baseframe. You cannot move the table isocenter as it is fitted the baseframe. I have not heard of anyone having to make any bearing adjustments to Varian table bearings. Good Luck. David Rodriguez email: PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Couch Rotational Walkout Message-ID: <38.132d2277.27de668f@cs.com> From: PilotDaveR@cs.com To: Russ.Lapenna@hrcc.on.ca, linac-eng@plato1.aristotle.net Subject: Re: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:51:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, my experience is that the table isocenter and gantry isocenter do not match. I had to move the gantry iso. to minimize the couch isocenter. Split the difference. The gantry can be moved by the four mounting bolts where it meets the baseframe. You cannot move the table isocenter as it is fitted the baseframe. I have not heard of anyone having to make any bearing adjustments to Varian table bearings. Good Luck. David Rodriguez email: PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Couch Rotational Walkout Message-ID: <38.132d2277.27de668f@cs.com> From: PilotDaveR@cs.com To: Russ.Lapenna@hrcc.on.ca, linac-eng@plato1.aristotle.net Subject: Re: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:51:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Russ, my experience is that the table isocenter and gantry isocenter do not match. I had to move the gantry iso. to minimize the couch isocenter. Split the difference. The gantry can be moved by the four mounting bolts where it meets the baseframe. You cannot move the table isocenter as it is fitted the baseframe. I have not heard of anyone having to make any bearing adjustments to Varian table bearings. Good Luck. David Rodriguez email: PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotational Walkout Message-ID: <9C688FB52A05D51194750002B325B5F714F5E7@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:15:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotational Walkout Message-ID: <9C688FB52A05D51194750002B325B5F714F5E7@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:15:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Couch Rotational Walkout Message-ID: <9C688FB52A05D51194750002B325B5F714F5E7@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'LINAC-ENG' Subject: Varian Couch Rotational Walkout Date: Mon, 12 Mar 2001 09:15:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I'm curious if anyone has experienced a form of slop in the rotational motion of a Varian linac couch. We have two machines that if you mark your isocentre with the couch at zero degrees, and then rotate 90 degrees in either direction the isocentre has moved (sometimes as much as 4mm). We have eliminated any slop in the couch top when checking this and still get the same result. If anyone has experienced this and knows of anything that can be tightened or how to replace/rebuild the bearing we would be quite interested to hear about it. Thanks Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Superficial tubes. Message-ID: <01C0A891.140D15A0.satya.rajapakse@dchs.tas.gov.au> From: satya rajapakse Reply-To: satya.rajapakse@dchs.tas.gov.au To: "LinacEng (E-mail)" , "'grant.smith@dchs.tas.gov.au'" Subject: Superficial tubes. Date: Thu, 8 Mar 2001 17:04:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear All We are planning for the disposal of our old superficial x-ray therapy,150 kV GEC ultrays, unit. due to old age(installed in 1984) and some problems with air bubbles getting into the oil in the tube housing. X-ray tube is the second one and working and it is less than 4 years old. Specs of the tube are: Manufacturer: Comet in Switzerland Type: XOR 125/150/2,3C kVDC - 150, kVAC - 140 Tube no. 49-4783 If any one is interested in the tube or whole unit please contact: Satya B. Rajapakse Chief Medical Physicist W.P.Holman Clinic Launceston General Hospital Charles Street,Launceston Tasmania 7250, Australia Ph: 61 3 6348 7152 Fx: 61 3 6331 6371 E-mail: satya.rajapakse@dchs.tas.gov.au ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <000951210631D311B91A00A0C9DED0B867ACE2@cal007.dpa.act.gov.au> From: "Caunt, Peter" To: "'Linac-eng@plato1.aristotle.net'" Subject: Date: Thu, 8 Mar 2001 15:53:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear John, I have run this one previously and the solution is not too costly. Varian HE pendants do have wear and tear problems with data comms. Whilst often quickly resolved by coiled cable replacement the constant stress on the socket connectors also contributes to this problem. For me the best solution has been to replace all the RJ45 connectors every 12-18 months i.e. the two in the couch and one in each pendant. Pendant : D885680-01 Couch : C4-700080-01 But check this first as couch may be different. Regards, Peter Caunt Radiation Oncology The Canberra Hospital Canberra, Australia. >Our machine is a 2100C3, S/N 1015. The pendant cable mounting plate on >the ETR couch has a plastic rectangular snap in piece that holds the >female RJ45 connector inside the couch. The tabs that hold the connector >in place have broken off. Has anyone else had these break and replaced >them? I have had no luck trying to find the product # of these or a >replacement, any suggestions? >Thanks in advance. >John Cocarell >Physics Technician >Allan Blair Cancer Centre >Regina, Sask. Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Connector mounting plate Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: John Cocarell Cc: Linac-eng Subject: Re: Connector mounting plate Date: Thu, 8 Mar 2001 14:52:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" John; We bought some thru Varian using part number 0088565301. Len On Thu, 08 Mar 2001 15:22:22 -0600 John Cocarell wrote: > Our machine is a 2100C3, S/N 1015. The pendant cable > mounting plate on the ETR couch has a plastic rectangular > snap in piece that holds the female RJ45 connector inside > the couch. The tabs that hold the connector in place have > broken off. Has anyone else had these break and > replaced them? I have had no luck trying to find the > product # of these or a replacement, any suggestions? > Thanks in advance. > > -- > _________________________ > John Cocarell > Physics Technician > Allan Blair Cancer Centre > Regina, Sask. Canada > 306 766 2286 > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Connector mounting plate Message-ID: <3AA7F80E.74F1CAA4@scf.sk.ca> From: John Cocarell To: Linac-eng Subject: Connector mounting plate Date: Thu, 8 Mar 2001 13:22:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Our machine is a 2100C3, S/N 1015. The pendant cable mounting plate on the ETR couch has a plastic rectangular snap in piece that holds the female RJ45 connector inside the couch. The tabs that hold the connector in place have broken off. Has anyone else had these break and replaced them? I have had no luck trying to find the product # of these or a replacement, any suggestions? Thanks in advance. -- _________________________ John Cocarell Physics Technician Allan Blair Cancer Centre Regina, Sask. Canada 306 766 2286 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Superficial tubes. Message-ID: <00BE56E17E26D11197CB00805FA6803A04FAC37C@pn_nt1.midcentral.co.nz> From: Keith Croft To: "LinacEng (E-mail)" Subject: Superficial tubes. Date: Thu, 8 Mar 2001 12:08:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have an old Philips RT50 that is in need of an X-ray tube. Is anyone wrecking/dumping or otherwise have a functional tube. (This machine we have not used as we have another superficial machine that is in normal use... so this would just sit as a backup unit.) Doug Steers of X-Raytherapy.com Inc has offered to have a batch of tubes made... but minimium order is for 10 tubes... we certainly are not that keen. Maybe if enough others wanted some tubes we could create an order between a group of us? Keith Croft Palmerston North Radiotherapy New Zealand. ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: RS &A Message-ID: <3AA7AA3B.D702046D@wfubmc.edu> From: tcullen@wfubmc.edu To: Patrick Lynch Cc: 'Linac-Talk' Subject: Re: RS &A Date: Thu, 8 Mar 2001 07:50:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Patrick, we have used this company for moving and servicing equipment and have been very satisfied with their performance. I can only comment on what I know about in this neck of the woods but they are obviously doing something right in this area because they have quite a few facilities in this state under contract and have good people working for them. I have met four of their engineers and and have nothing negative to say about any of them yet. I recently made the decision to have my department call them in to cover for me when I'm out or on vacation. In my opinion you would not be making a mistake if you had them do your service work. Your name sounds familiar, were you a member of the NCBA at one time? Tim Cullen Patrick Lynch wrote: > Can anybody tell me about this company? I'm seriously considering them for > our 7 units (instead of Varian), but thjey are new to Georgia and I'm > concerned about backup, parts, etc. > > Thanks, > > Patrick K. Lynch, CBET, MBA > Director, BioMedical Engineering > Northside Hospital > patrick.lynch@northside.com > > 404/851-6170 work > 800-224-3094 pager > > Note: The information contained in this message and any attachments may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, or other use of this communication or any of its attachments is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting this message, any attachments, and all copies and backups from your computer. If you have received this communication in error and are unable to reply to this message, please notify the sender immediately by telephone at (404) 851-8000. Thank you. Northside Hospital ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: UPS for linacs. Message-ID: <5.0.0.25.0.20010308212652.00a39870@mail.iinet.net.au> From: Ron Kimber To: Linac-eng@plato1.aristotle.net Subject: UPS for linacs. Date: Thu, 8 Mar 2001 05:57:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" A short while back I enquired if anyone had experience with running a complete linac on a UPS. No-one admitted to having done it so I thought some of you may be interested. We have now been running an Elekta SL15 for the past three weeks on a UPS. We decided on a 40kVA unit but this may be a bit bigger than is actually required. We are running about 10 amps per phase in preparatory rising to 20 amps per phase when beaming. The unit is capable of 55 amps per phase so it is intended to use some of the extra capacity for emergency lighting and patient monitoring CCTV, etc. and also need to connect up the water pump of the chiller to the UPS. . We should get about 50 minutes backup time in preparatory. This will allow the completion of treatment of a patient on the bed if the power fails and an orderly shutdown if the power stays out. As far as costs go the UPS is only more costly than a power conditioner to the value of the batteries. We paid $26k all up for the UPS and would have been up for about $20k for a conditioner. Of course we now have a bit higher overhead on maintenance and expect to replace the batteries at 5 years or so. We have already seen the value of the UPS when a general (city wide) power dip dropped out our SL75/5 and both of our SL15's at another site, the SL15 on the UPS was unaffected. If our local power keeps getting less reliable we could end up with the whole place running on UPS and have even discussed backup gensets. Regards Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Phone: 61 (0) 8 9381 5655 Mobile: 041 993 7776 Fax:61 (0) 8 9381 4364 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Linac Engineer position Perth Australia. Message-ID: <5.0.0.25.0.20010308211130.00a08150@mail.iinet.net.au> From: Ron Kimber To: Linac-eng@plato1.aristotle.net Subject: Linac Engineer position Perth Australia. Date: Thu, 8 Mar 2001 06:01:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Troops, Perth Radiation Oncology Centre has an opening for an engineer. We have 5 linacs and 2 simulators on two sites. We need an engineer with top ability to keep this gear going. Experience and success with therapy service would be an advantage but true service ability is the key. The position requires Australian citizenship, permanent residency status or at least a long term visa. We would expect the engineer would also want to live here, long term. Anyone interested in a bit of hard work and occasional late nights get in touch. It is intended to find a suitable compensation package for the endeavours which will result in keeping the departments running. Best regards to you all. Ron Kimber Biomedical Service Perth Radiation Oncology Centre 24 Salvado Rd Wembley WA 6014 AUSTRALIA Phone: 61 (0) 8 9381 5655 Mobile: 041 993 7776 Fax:61 (0) 8 9381 4364 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Alias,anonymous,hidden etc. Message-ID: <9C688FB52A05D51194750002B325B5F714F5C8@hrccex.hrcc.on.ca> From: "Lapenna, Russ" To: 'Dave D' , Linac-Eng Subject: RE: Alias,anonymous,hidden etc. Date: Thu, 8 Mar 2001 05:13:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" O.K. I'm sorry, I will refrain from any further posts. Samual L. Jackson > > This is a list that has constructive intentensions, could > those who post > info under a false identity just go away? > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Marconi Sim CT. Message-ID: <3AE23899EECFD411B2210008C7B2BF399F509E@wmhmail.whs.org> From: "Williams, Rod" To: "'linac-eng@plato1.airistotle.net'" Subject: Marconi Sim CT. Date: Wed, 7 Mar 2001 06:06:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all, We are looking to purchase two C.T. sims and would like to hear from anyone that has been using Marconi or G.E. Any information would be greatly appreciated. Thanks Rod Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: anonymous Message-ID: <002701c0a7b2$59760d20$8d7abcbc@RMPDNGH> From: John Byrne To: Dave D , Linac-Eng Subject: Re: anonymous Date: Thu, 8 Mar 2001 01:30:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" From: Dave D Subject: Alias,anonymous,hidden etc. > This is a list that has constructive intentensions, could those who post > info under a false identity just go away? Who's DaveD? =================================== John Byrne, SRCS, PhD Principal Physicist Regional Medical Physics Department Newcastle General Hospital Newcastle Upon Tyne NE4 6BE UK tel +44 (0)191 273 8811 x-22196 =================================== ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RS &A Message-ID: <4FC7CE283E50D21184A500805FA786EF0395C94E@NS1_4000> From: Patrick Lynch To: 'Linac-Talk' Subject: RS &A Date: Wed, 7 Mar 2001 10:49:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Can anybody tell me about this company? I'm seriously considering them for our 7 units (instead of Varian), but thjey are new to Georgia and I'm concerned about backup, parts, etc. Thanks, Patrick K. Lynch, CBET, MBA Director, BioMedical Engineering Northside Hospital patrick.lynch@northside.com 404/851-6170 work 800-224-3094 pager Note: The information contained in this message and any attachments may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, or other use of this communication or any of its attachments is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting this message, any attachments, and all copies and backups from your computer. If you have received this communication in error and are unable to reply to this message, please notify the sender immediately by telephone at (404) 851-8000. Thank you. Northside Hospital ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Position Available - The University of Massachusetts Message-ID: <351F39924BC5D311A35C0050DA2AC9B0065872@hcunivexch03.ummhc.org> From: "Villegas, Jose" To: 'Linear Accelereator submissions' Subject: Position Available - The University of Massachusetts Date: Wed, 7 Mar 2001 13:26:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The Department of Biomedical Engineering at Umass Memorial Health Care has an opening for a Biomedical Specialist. Responsibilities of this position include providing engineering coverage during the treatment day, Responsible for specific assignments/projects, as well as medical equipment preventative maintenance ("P.M."), repairs for equipment housed in the Radiation Oncology Departments at Umass Memorial. and engineering support for the physics. Experience: Varian High, Low energy "C" series 80, 52 Leaf MLC Portal Vision Mark I, II Ximatron Qualifications are a thorough knowledge of test instruments, equipment, mechanical and high voltage safety procedures, Associates Degree in Electronics or Military experience. Minimum of five years experience with Radiation Oncology medical equipment preventative maintenance and repair. Equipment includes: linear accelerator (MLC, PV) simulation radiographic unit and miscellaneous other equipment. Experience in computer hardware/software Please fax inquires and resumes to Biomedical Eng. Director: Terry Crofts 508-334-8021 e-mail: CroftsT@ummhc.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Alias,anonymous,hidden etc. Message-ID: <000a01c0a779$fb6733e0$989aacd1@pen300> From: Dave D To: Linac-Eng Subject: Alias,anonymous,hidden etc. Date: Wed, 7 Mar 2001 18:46:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is a list that has constructive intentensions, could those who post info under a false identity just go away? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: MLC 80 - 100 cond.cables Message-ID: From: "Bush, Thomas M." To: 'David Burgess ' Cc: "'Linac-eng@plato1.aristotle.net'" Subject: RE: MLC 80 - 100 cond.cables Date: Tue, 6 Mar 2001 10:06:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dave... Thanks to all on the thoughts on the leaf end-clearance issue. Just wanted to let everyone know that Varian has changed the Mk-4 (52 or 80 leaf) MLC ribbon cables PN 01101099-xx to a -04 version that is again shorter and will not "crimp" and ultimately fail like the potted and longer -03 versions. The new -04 is not potted at the connectors. Maybe this is the final ribbon cable for this application.! Tom Bush -----Original Message----- From: David Burgess [mailto:CCWDB@qe2-hsc.ns.ca] Sent: Friday, February 02, 2001 6:59 AM To: linac-eng@plato1.aristotle.net Subject: MLC 80 - 100 cond.cables Hello all, A while back someone ( maybe Tom Bush ) asked me if I had any experience with the longevity of the newer style MLC 1101099-03 type 100 conductor potted end ribbon cables. They develope a sharp bend close to the P41 connector on the Interconnect PCB, and this appeared to be a possible area for intermittance. I can now report that the first one of these I installed on July 24/00 had to be replaced Jan 31/01. Thats only 6 months of operation ... Since July, I've installed several others. I always write the date installed on them - I'll let you know if more fail. David Burgess Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: GE maximar orthovoltage units Message-ID: From: Steersdad@aol.com To: linac-eng@plato1.aristotle.net Subject: GE maximar orthovoltage units Date: Tue, 6 Mar 2001 03:44:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Friends, We posted a message about one week back regarding the avaialbility of two GE Maximar 250kV orthovoltage therapy systems. While we had several responses, no one has yet decided they want them. So, this is the last offering before they go to the recycling center. One has been stored, complete and packed on palletts. The other has been in use, but likely needs a tube from the stored one. They are located in Nashville, TN, and will be available next Monday on the loading dock. Otherwise, Tuesday they will head to the recycling yard. Which is rather unfortunate, as these two systems represent a lifetime's worth of spare parts. Please contact me directly for information. Regards, Doug Steers www.x-raytherapy.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: New Careers Inc. Message-ID: From: eng site To: resumes@newcareersinc.com, accelinearms@earthlink.net Cc: linac-eng@plato1.aristotle.net Subject: Re: New Careers Inc. Date: Mon, 5 Mar 2001 21:24:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I just can't help myself. For nearly 3 years I've quietly watched this listserver. This is at least the third time in that period when I have seen the Acceletronics/Accelinear (Rivalry? I don't know what it is, just that it is) diatribe rear its ugly head for all of us to see. Quite frankly who cares who is who. Who cares that yes, there are 2 RadsRUs and one of them is the President of Acceletronics, or that coincidentally the RadsRus who happens to be the recruiter for New Careers was at one time employed by Acceletronics but most recently was employed at Fox Chase Cancer Center. They are not the same person, that much is clear. So what if they were? We are a very small community with exceptionally few secrets. If there are opportunities, which there are, and there are people, which there are, then it is my opinion that this listserver can serve to bring them together. I'm not here to defend or accuse anyone, I'd just like to see us using this incredible tool we have for all the positive things that we can. It goes without saying that if you are looking for new opportunities this can be a valuable resource, even more so if you are looking for good advice - Which both of the aforementioned companies have dispensed liberally for all of us to share. Now if we could just get this Linac Engineer Society thing off the ground.... _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: New Careers Inc. Message-ID: <003201c0a5cc$694f73e0$8513a3ac@bill> From: Resumes Reply-To: Resumes To: MARTIN SHAPIRO Cc: linac-eng@plato1.aristotle.net Subject: Re: New Careers Inc. Date: Mon, 5 Mar 2001 15:31:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Marty, NEW CAREERS IS NOT ASSOCIATED WITH ACCELETRONICS INC. WE ALSO ADOPTED THE RADSRUS NAME AT "HOTMAIL" THREE YEARS AGO! SO RESUMES ARE NOT JUST FOR ACCELETRONICS, I ALSO HAVE MANY OTHER COMPANIES THAT WE WORK WITH! WE WOULD BE HAPPY TO WORK WITH YOUR COMPANY AS WELL! V/R NEW CAREERS INC ----- Original Message ----- From: MARTIN SHAPIRO To: Linac-Eng (E-mail) Sent: Monday, March 05, 2001 1:22 PM Subject: New Careers Inc. > For anyone who cares, time can be saved when sending resume's to New Careers > Inc.. Just send them directly to Acceletronics. If you checkout the web site > (http://www.newcareersinc.com/positionsavailable.htm) you will see at the > bottom the webmaster is RADSRUS aka Steve Schwarz, president of > Acceletronics. > > It would seem very unlikely that New Careers will have the best job listings > as I doubt any of the major manufacturers will use Acceletronics' services > nor will we at Accelinear. > > Might I suggest that anyone in this field interested in a position change > might post his/her resume on the list server (write it in an anonymous > fashion). Respones can be handled through a Hotmail or Yahoo type E-mail > forwarding account. > > Just as a note, at Accelinear we are always looking for good service people. > Just send your resume to LSavona@Accelinear .com. > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: New Careers Inc. Message-ID: <005901c0a5a1$455b4160$6501a8c0@nt01c6.cpe.charterne.com> From: MARTIN SHAPIRO To: "Linac-Eng (E-mail)" Subject: New Careers Inc. Date: Mon, 5 Mar 2001 10:22:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For anyone who cares, time can be saved when sending resume's to New Careers Inc.. Just send them directly to Acceletronics. If you checkout the web site (http://www.newcareersinc.com/positionsavailable.htm) you will see at the bottom the webmaster is RADSRUS aka Steve Schwarz, president of Acceletronics. It would seem very unlikely that New Careers will have the best job listings as I doubt any of the major manufacturers will use Acceletronics' services nor will we at Accelinear. Might I suggest that anyone in this field interested in a position change might post his/her resume on the list server (write it in an anonymous fashion). Respones can be handled through a Hotmail or Yahoo type E-mail forwarding account. Just as a note, at Accelinear we are always looking for good service people. Just send your resume to LSavona@Accelinear .com. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Apology Message-ID: <006301c0a430$eab9bb40$5d28bf98@bill> From: Billy Barnes Reply-To: Billy Barnes To: linac-eng@plato1.aristotle.net Subject: Apology Date: Sat, 3 Mar 2001 14:25:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Just to clarify some information about New Careers... We are a Technical Recruiting Firm who has been in business for over 18 years. Our reputation is spotless and our recruiters are professionals who take pride in what we do. Our rates are lower than most Recruiting Firms and we produce excellent results in getting people a job. If anyone has a question about our firm, we welcome you to leave your name and number, we will get back with you ASAP to answer any questions you might have about our company. The amount of jobs posted are true, and we actually have more listings now available than when this was first posted to the list. The salary information is accurate for a Linac Engineer with 10 to 15 years experience and OEM training, some engineers in the business are making more than my estimates, if you count overtime. Again, we are here to help Engineers find jobs, and to help companies find Engineers... We do not sell the information to any other source and as I said in the previous list, NO INFORMATION will be released to ANYONE without Your prior approval. We look forward to serving the Linac Engineer community and I apologize if my post is an intrusion into the list. I have seen others post jobs here and we are just doing the same. Our apologies again are offered if we offended anyone on the list, our intentions were just to help those who wanted it. Very Respectfully, New Careers Inc. Resumes@newcareersinc.com www.newcareersinc.com 610-495-1729 fax ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Choices Message-ID: <3AA13A52.98581F1@reyes.stanford.edu> From: Mark Wanlass To: linac-eng@plato1.aristotle.net Subject: Re: Choices Date: Sat, 3 Mar 2001 10:39:14 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I don't know anything about this particular company, but the number of job openings claimed seems like a lot. Also, it is not uncommon for employment agencies to claim that many attractive jobs are available at high salaries, when that is in fact not the case. The purpose of that practice is to collect resumes, so that when a real job opening appears, the agency can jump in and make the first contact with the employer, thus requiring the employer to pay a fee in order to obtain the candidate in question. It works like this: Agency sees ad, calls employer and says, "I have a wonderful candidate that perfectly meets your needs. Can I fax you some info?" The employer says, "Sure, lets see what you've got." Then they get a fax with a resume of somebody and a statement that if the person is hired, it will cost an amount equal to 2 months of the employees salary (or something like that). As you can imagine, upon seeing that, the employer often completely loses interest in the candidate. Maybe that wouldn't be so bad if it was a job you never heard about in the first place, but it could happen with a job posted right here on the linac engineers list. So, before everyone proceeds to send in their resumes, I think it would be nice if New Careers would tell us more about all the positions they have open, what their fees to the employer are , and whatever else they can tell us about they do business, to help assure us that they aren't just fishing for resumes. > Hello Linac Engineers, > > I will get to the point. > > Linac Engineers are some of the most sought after Engineers in the Medical > Industry. > > New Careers currently has over 35 Linac Engineering positions available > throughout the country! > Salary's can go as high as $90k+ with cars, and benefits extra! > > Your job can be VERY difficult, both Professionally & Personally, are you > rewarded enough for Hard Work and Late Nights? If not New Careers can help > you get into a better job! > > The company looking for you will pay all cost, NOTHING WILL BE CHARGED TO > THE ENGINEER! > > ALL INFORMATION WILL BE KEPT SECRET AND WILL NOT BE EXPOSED WITHOUT YOUR > PERMISSION! > > Please visit our Web Site at WWW.NEWCAREERSINC.COM > OR > Email your resume to RESUMES@NEWCAREERSINC.COM > OR > Fax your resume to 610-495-1729 Fax. > > www.newcareersinc.com > 610-495-1729 Fax > resumes@newcareersinc.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Choices Message-ID: <000b01c0a3f5$04588900$65d3b798@bill> From: Resumes Reply-To: Resumes To: linac-eng@plato1.aristotle.net Subject: Choices Date: Sat, 3 Mar 2001 07:17:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Linac Engineers, I will get to the point. Linac Engineers are some of the most sought after Engineers in the Medical Industry. New Careers currently has over 35 Linac Engineering positions available throughout the country! Salary's can go as high as $90k+ with cars, and benefits extra! Your job can be VERY difficult, both Professionally & Personally, are you rewarded enough for Hard Work and Late Nights? If not New Careers can help you get into a better job! The company looking for you will pay all cost, NOTHING WILL BE CHARGED TO THE ENGINEER! ALL INFORMATION WILL BE KEPT SECRET AND WILL NOT BE EXPOSED WITHOUT YOUR PERMISSION! Please visit our Web Site at WWW.NEWCAREERSINC.COM OR Email your resume to RESUMES@NEWCAREERSINC.COM OR Fax your resume to 610-495-1729 Fax. www.newcareersinc.com 610-495-1729 Fax resumes@newcareersinc.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Accessories Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Varian Accessories Date: Fri, 2 Mar 2001 05:37:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks! I'm looking to source some accesories for Varians: We are looking for a solid couch top (maybe carbon fibre), not mesh, for ETR style couches. Apparently, other clinics have used this to eliminate sag. This is an insert for the couch top, it does not replace the mesh because you cannot see any markings on the patient. Does Varian make these? Or another manufacturer? We are also looking for larger upper wedges. Presently, our wedges are 20cm x 40cm. We are looking for 30cm x 40cm. Any thoughts? Any comments would be helpful! Thanks in advance, Carl Murphy, C.E.T. Linear Accelerator Service Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta Message-ID: From: Christian Knopper Reply-To: Christian.Knopper@LKH-klu.at To: Newsgroup Linac Subject: Elekta Date: Fri, 2 Mar 2001 02:23:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all! Thanks for your reply. I also got many answers posted directly to me. So it seems, that there are also many Elekta users. It looks like that all of them made the same experience that we made: - The machines are running very stable - The Helpdesk is easily reachable, and in most cases very helpful We are using two SL18+ and one SL75/5, and all three machines have a downtime from approx. 1% (Downtime included planned Maintainance to LT hours). Now we are also happy with the RTD Software. When we began with RTD it was a real nightmare. But now it seems, that they have solved most of the problems with the software. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SV: Vidar VXR-12 Diagnostic Film digitizer (scanner) Message-ID: From: Viking Eilert To: D_Liounis@FCCC.EDU Cc: linac-eng@plato1.aristotle.net Subject: SV: Vidar VXR-12 Diagnostic Film digitizer (scanner) Date: Fri, 2 Mar 2001 00:03:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello We use aha-2940 and it works fine, but set down the speed for the = scsiID for your VIDAR scanner to the lowest value (5). Eilert Viking Universitetssjukhuset i Link=F6ping Sweden > -----Ursprungligt meddelande----- > Fr=E5n: Liounis, Dave [SMTP:D_Liounis@FCCC.EDU] > Skickat: den 2 mars 2001 00:05 > Till: 'Magnus Jalmbrant'; linac-eng@plato1.aristotle.net > =C4mne: RE: Vidar VXR-12 Diagnostic Film digitizer (scanner) > > Magnus: > > Your problem is the SCSI controller card. If you look in your manual = page > 11 > Installing your Film Scanner paragraph 3 it tells you not to use the > AHA-2940 because they are to fast for the scanner. They recommend = Adeptec > SCSI controller card with EZ- SCSI software but not the model you = have. > Any > questions give me a call and maybe we can help you. > > David J Liounis > Fox Chase Cancer Center > Department of Radiation Oncology Engineering > 215-728-2997 > D_LIOUNIS@FCCC.EDU > > -----Original Message----- > From: Magnus J=E4lmbrant [mailto:magnus.jalmbrant@radfys.umu.se] > Sent: Friday, February 23, 2001 3:32 AM > To: linac-eng@plato1.aristotle.net > Subject: Vidar VXR-12 Diagnostic Film digitizer (scanner) > > > Hi everyone! > > Is there anybody running a system including a Vidar VXR-12 Scanner? > If so, I have the following problem: > I can=B4t get it working in a PC environment, reinstalled the = connected PC > this week whereupon the scanner "ceased" to function properly. The = scanner > is connected to our TMS (Treatment planning) system and works fine = from > there. The SCSI interface in the PC is adaptec:s AHA-2940 and it = detects > the > scanner OK, but when starting WINNT the SCSI unit contains eight!! > connected > Vidar VXR-12 units. I=B4ve installed the latest drivers for the SCSI = card as > well as the latest TWAIN drivers (required to run the Vidar = scanner...). > The problem is probably something with the configuration but I = can=B4t > figure > out exactly what! > > Regards > > Magnus J=E4lmbrant > Department of Radiation Physics > Norrlands University Hospital > Ume=E5 > Sweden > > <> ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Vidar VXR-12 Diagnostic Film digitizer (scanner) Message-ID: <002101c0a2e9$26fbf4e0$4d5611c2@us.vll.se> From: =?iso-8859-1?Q?Magnus_J=E4lmbrant?= To: "Liounis, Dave" , linac-eng@plato1.aristotle.net Subject: Re: Vidar VXR-12 Diagnostic Film digitizer (scanner) Date: Thu, 1 Mar 2001 23:19:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi and thanks for all the response on my problem. I=B4ve finally = figured out the problem and it turned out not to be the SCSI card at all, it seemed = like a hardware-lock to the posiedon software was placed in the wrong place = i.e. another lock was mounted before it in the chain... Also figured out that eight VXR-12 units visible under the SCSI = controller (Control Panel - SCSI) also was OK, at least there are the same = settings with eight units on at least one location (wich works just fine) except = for ours. Just have one problem now to get VarisVision to find the scanner, will probably have to contact varian service about that one (and yes we have installed the license for the vidar scanner...). =20 Again thanks for all the reply=B4s. =20 Magnus J=E4lmbrant Radiation Physics, NUS, Ume=E5, Sweden ----- Original Message -----=20 From: Liounis, Dave =20 To: 'Magnus J=E4lmbrant' ; linac-eng@plato1.aristotle.net = Sent: Thursday, March 01, 2001 11:19 PM Subject: RE: Vidar VXR-12 Diagnostic Film digitizer (scanner) Magnus: =20 Your problem is the SCSI controller card. If you look in your manual = page 11 Installing your Film Scanner paragraph 3 it tells you not to use the AHA-2940 because they are to fast for the scanner. They recommend = Adeptec SCSI controller card with EZ- SCSI software but not the model you have. = Any questions give me a call and maybe we can help you. =20 David J Liounis=20 Fox Chase Cancer Center=20 Department of Radiation Oncology Engineering=20 215-728-2997=20 D_LIOUNIS@FCCC.EDU=20 -----Original Message----- From: Magnus J=E4lmbrant [mailto:magnus.jalmbrant@radfys.umu.se] Sent: Friday, February 23, 2001 3:32 AM To: linac-eng@plato1.aristotle.net Subject: Vidar VXR-12 Diagnostic Film digitizer (scanner) Hi everyone! =20 Is there anybody running a system including a Vidar VXR-12 Scanner? If so, I have the following problem: I can=B4t get it working in a PC environment, reinstalled the connected = PC this week whereupon the scanner "ceased" to function properly. The = scanner is connected to our TMS (Treatment planning) system and works fine from there. The SCSI interface in the PC is adaptec:s AHA-2940 and it = detects the scanner OK, but when starting WINNT the SCSI unit contains eight!! = connected Vidar VXR-12 units. I=B4ve installed the latest drivers for the SCSI = card as well as the latest TWAIN drivers (required to run the Vidar = scanner...). The problem is probably something with the configuration but I can=B4t = figure out exactly what! =20 Regards =20 Magnus J=E4lmbrant Department of Radiation Physics Norrlands University Hospital Ume=E5 Sweden ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Vidar VXR-12 Diagnostic Film digitizer (scanner) Message-ID: From: "Liounis, Dave" To: =?iso-8859-1?Q?=27Magnus_J=E4lmbrant=27?= , linac-eng@plato1.aristotle.net Subject: RE: Vidar VXR-12 Diagnostic Film digitizer (scanner) Date: Thu, 1 Mar 2001 14:19:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Magnus: =20 Your problem is the SCSI controller card. If you look in your manual = page 11 Installing your Film Scanner paragraph 3 it tells you not to use the AHA-2940 because they are to fast for the scanner. They recommend = Adeptec SCSI controller card with EZ- SCSI software but not the model you have. = Any questions give me a call and maybe we can help you. =20 David J Liounis=20 Fox Chase Cancer Center=20 Department of Radiation Oncology Engineering=20 215-728-2997=20 D_LIOUNIS@FCCC.EDU=20 -----Original Message----- From: Magnus J=E4lmbrant [mailto:magnus.jalmbrant@radfys.umu.se] Sent: Friday, February 23, 2001 3:32 AM To: linac-eng@plato1.aristotle.net Subject: Vidar VXR-12 Diagnostic Film digitizer (scanner) Hi everyone! =20 Is there anybody running a system including a Vidar VXR-12 Scanner? If so, I have the following problem: I can=B4t get it working in a PC environment, reinstalled the connected = PC this week whereupon the scanner "ceased" to function properly. The = scanner is connected to our TMS (Treatment planning) system and works fine from there. The SCSI interface in the PC is adaptec:s AHA-2940 and it = detects the scanner OK, but when starting WINNT the SCSI unit contains eight!! = connected Vidar VXR-12 units. I=B4ve installed the latest drivers for the SCSI = card as well as the latest TWAIN drivers (required to run the Vidar = scanner...). The problem is probably something with the configuration but I can=B4t = figure out exactly what! =20 Regards =20 Magnus J=E4lmbrant Department of Radiation Physics Norrlands University Hospital Ume=E5 Sweden ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Engineering and Technician future in the UK NHS Message-ID: From: mick Wingell To: linac-eng@plato1.aristotle.net Subject: Engineering and Technician future in the UK NHS Date: Thu, 1 Mar 2001 12:12:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry for disseminating this info in this way but it is of interest to the UK linac eng/tech staff. It may be also be of interest to the world at large. Please read the info at www.doh.gov.uk/makingthechange Regards to all Mick Wingell St. Luke's Cancer Centre. Royal Surrey County Hospital Guildford Surrey GU27XX UK ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: FW: imagetalk Varian Parts Message-ID: From: "Cunningham, Richard" To: "Wilson, Jim" Subject: FW: imagetalk Varian Parts Date: Thu, 1 Mar 2001 10:57:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thought you might know a source of parts for this guy. Rich -----Original Message----- From: Bitler, Richard L [mailto:RLBitler@LHA.org] Sent: Thursday, March 01, 2001 10:40 AM To: 'imagetalk@medicalparts.org' Subject: RE: imagetalk Varian Parts We have used Acceletronics. I don't know where you are located, but their web site is www.acceletronics.com Rick Bitler Lancaster Health Alliance Lancaster, PA > -----Original Message----- > From: Boyd Campbell [SMTP:BCAMPBELL@catawbamemorial.org] > Sent: Thursday, March 01, 2001 1:09 PM > To: imagetalk@medicalparts.org > Subject: imagetalk Varian Parts > > Does anyone know of a second source for parts for Varian Linear > Accelerators models 1800 or 2100? > > Boyd Campbell CBET, CRES > Catawba Memorial Hospital > > ImageTalk supported by MedicalParts.com ImageTalk supported by MedicalParts.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 80 leaf varian MLC Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "Bush, Thomas M." Cc: "'Linac-eng@plato1.aristotle.net'" Subject: Re: 80 leaf varian MLC Date: Thu, 1 Mar 2001 09:58:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tom; You are doing the same set-up and checking that I am doing. I attempt to have the leaf positions correct when positioned 2mm from the centerline and then check again at 5.0cm. My previous posting was regarding someones question about apparent leaf to leaf contact/interference. We have had this happen when one of the leaf drives was sticking and would not allow a leaf to retract quickly enough to get out of the way when it's opposite leaf/carriage were moving into position. We have also had a crash when communications failed during a carriage/leaf reposition. The comment about the end gap, skew, offset adjustments being checked was from an experience where an incorrect number was enterred in the MLCXCAL.TXT file and we had leaf to leaf contact. Regards, Len On Wed, 28 Feb 2001 15:11:03 -0800 "Bush, Thomas M." wrote: > Picture this... you're working on an 80 leaf MLC, > calibrating the MLCXCAL.TXT file parameters. Your done > and everything looks great. When the 80 leaves are all > closed, how much , if any, mechanical gap should there be > between the opposing leaves using a feeler gauge at the > MLC? I have the #1 A/B and the #40 A/B gaps exactly > equal, parallel to the jaw faces and equidistant from > center line etc. and with a closed gap of two thousandths > inch. Obviously, I can make them touch but am concerned > that if they touch one or some of the lead screws may bend. > What is the line of thinking on this alignment? Len..... > you must know the correct alignment so ..... Whhhaattssss > Uuuuuupppp.?? ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta Message-ID: <003e01c0a253$2360b6e0$5a2257c0@gugten.rt.nki.nl> From: H van der Gugten To: David Price , linac-eng@plato1.aristotle.net Subject: Re: Elekta Date: Thu, 1 Mar 2001 05:25:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" David, Here in Amsterdam at the Netherlands Cancer Institute we have extensive experience with Elekta equipment. In the Netherlands as a whole there are 40+ linear accelerators installed by Elekta, and I guess that in most of the 13 centres involved engineers and fysicist are in the list serve. I may point you at a special service provided by my collegue Jan Kok in the university hospital in the town of Utrecht (the Netherlands). He maintains a usefull FAQ list about maintenance and trouble shooting in Elekta accelerators. The adress is: http://www.isi.uu.nl/radiotherapy/linaceng/index.html Hope this is helpfull to you Henk W. van der Gugten technical specialist radiotherapy voice : xx31.(0)20.512.2116 Netherlands Cancer Institute fax : xx31.(0)20.669.1101 Amsterdam email : gugten@nki.nl the Netherlands -----Original Message----- From: David Price To: linac-eng@plato1.aristotle.net Date: donderdag 1 maart 2001 13:19 Subject: Elekta >It would be nice to get an Idea on just how many engineers take care of >Elekta/Phillips Linacs in the list serve > >Would it possiable to have engineers that work on phillips/elekta machines >email me back... It would be nice to know. I do feel we are somewhat in a >minority near and to have a list of resources to poll directly concerning >problems would be nice > > >David Price >SHands Cancer Center >2000 SW archer Rd >Gainesville Fla, 32610 >W 352-395-0316 > >Opinions expressed here are entirely my own and do not constitute any >affirmation from my employer, the University of Florida, or my pet gerbil, >Herbie > >"Linac Engineers List Server (E-mail)" >linac-eng@plato1.aristotle.net > > > >>From: "Christian Knopper" >>Reply-To: >>To: >>Subject: Elekta >>Date: Tue, 27 Feb 2001 11:20:16 +0100 >> >>Hello! >> >>I'm member of this news group now for approx. 3 month. Since this time I'am >> >only reading about Siemens and Varian problems. Are there no >>Elekta/Philips >users using this group? > > > > >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta Message-ID: From: David Price To: linac-eng@plato1.aristotle.net Subject: Elekta Date: Thu, 1 Mar 2001 04:14:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It would be nice to get an Idea on just how many engineers take care of Elekta/Phillips Linacs in the list serve Would it possiable to have engineers that work on phillips/elekta machines email me back... It would be nice to know. I do feel we are somewhat in a minority near and to have a list of resources to poll directly concerning problems would be nice David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: "Christian Knopper" >Reply-To: >To: >Subject: Elekta >Date: Tue, 27 Feb 2001 11:20:16 +0100 > >Hello! > >I'm member of this news group now for approx. 3 month. Since this time I'am > >only reading about Siemens and Varian problems. Are there no >Elekta/Philips >users using this group? _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 80 leaf varian MLC Message-ID: From: "Bush, Thomas M." To: "'Linac-eng@plato1.aristotle.net'" Subject: 80 leaf varian MLC Date: Wed, 28 Feb 2001 15:11:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Picture this... you're working on an 80 leaf MLC, calibrating the MLCXCAL.TXT file parameters. Your done and everything looks great. When the 80 leaves are all closed, how much , if any, mechanical gap should there be between the opposing leaves using a feeler gauge at the MLC? I have the #1 A/B and the #40 A/B gaps exactly equal, parallel to the jaw faces and equidistant from center line etc. and with a closed gap of two thousandths inch. Obviously, I can make them touch but am concerned that if they touch one or some of the lead screws may bend. What is the line of thinking on this alignment? Len..... you must know the correct alignment so ..... Whhhaattssss Uuuuuupppp.?? ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SV: Varian MLC Message-ID: <5A23C7CF5B82D411B255009027DE834C920A7A@pat> From: Henrik Stensaker To: "'Peter E. Vitali'" Cc: linac-eng@plato1.aristotle.net Subject: SV: Varian MLC Date: Wed, 28 Feb 2001 12:58:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We also had a Sagittaire up to 1996.... Today we have GE Saturne 43s, BBC LA4, Varian CL2100CD #1193, Varian CL2300CD #151 and Varian CL600CD #450. All our Varian machines have a "pit" and a floor that goes down (about 10 cm.) when we rotate the gantry. I thought that all new Varian machines had this system ? The idea is to lower the isocentre. When the floor goes down, there are 2 halogen lamps that lights up the lowered circle. Hope this helps ! Henrik Stensaker Haukeland Hospital Norway -----Opprinnelig melding----- Fra: Peter E. Vitali [mailto:peter.vitali@yale.edu] Sendt: 28. februar 2001 15:37 Til: Henrik Stensaker Kopi: linac-eng@plato1.aristotle.net Emne: Re: Varian MLC What Pit and What light? You dropping the floor when you rotate the Gantry? Last time we had a pit with a light in it, it was because the floor dropped 4 feet to allow a CGR Sagittaire Linear Accelerator to rotate. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF96C@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Peter E. Vitali'" , Henrik Stensaker Cc: linac-eng@plato1.aristotle.net Subject: RE: Varian MLC Date: Wed, 28 Feb 2001 09:35:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 600c with VEO base frame has a floor that drops with rotation. A weird feeling when you step in the hole! > -----Original Message----- > From: Peter E. Vitali [SMTP:peter.vitali@yale.edu] > Sent: Wednesday, February 28, 2001 9:37 AM > To: Henrik Stensaker > Cc: linac-eng@plato1.aristotle.net > Subject: Re: Varian MLC > > What Pit and What light? You dropping the floor when you rotate the Gantry? > Last time we had a pit with a light in it, it was because the floor > dropped 4 feet to allow a CGR Sagittaire Linear Accelerator to rotate. > > Peter E. Vitali, CBET > Therapeutic Radiological Engineer > Department of Radiation Physics > Yale-New Haven Hospital > 15 York Street > New Haven, CT. 06504 U.S.A. > Tel: 203 688-2948 > Fax: 203 688-3663 > E-Mail: peter.vitali@yale.edu > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC Message-ID: <3A9D0D0B.3497445C@yale.edu> From: "Peter E. Vitali" To: Henrik Stensaker Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian MLC Date: Wed, 28 Feb 2001 06:37:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What Pit and What light? You dropping the floor when you rotate the Gantry? Last time we had a pit with a light in it, it was because the floor dropped 4 feet to allow a CGR Sagittaire Linear Accelerator to rotate. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC Message-ID: <5A23C7CF5B82D411B255009027DE834C920A73@pat> From: Henrik Stensaker To: linac-eng@plato1.aristotle.net Subject: RE: Varian MLC Date: Tue, 27 Feb 2001 22:39:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi ! We have 3 Varian MLC machines. We have drilled a hole in the "canoe", and leave the machines at 180 during night and weekends. This works fine for us. I think the 90 solution from Varian takes more time (you have to turn the collimator too). And you have to turn gantry back to 0 or 180, before starting the MLC controller. I also think that 180 is the best position if you have a leak. The "pit" is big and deep enough to take some water, and it is a lot simpler and cheaper to repair. The only disadvantage about the 180 position is that the lights in the pit is on, and you have to make arrangements with the cleaning personal ! Henrik Stensaker Haukeland Sykehus Norway. -----Opprinnelig melding----- Fra: Randy.McVittie@lrcc.on.ca [mailto:Randy.McVittie@lrcc.on.ca] Sendt: 27. februar 2001 18:56 Til: linac-eng@plato1.aristotle.net Emne: Varian MLC Hello all: We are discussing where to leave the gantry at night on our MLC machines. I think I heard that Varian recommends 90 or 270, but we were thinking why not leave it at 180 degrees? And maybe put a drain hole in the canoe cover so that it water doesn't sit there. (I am talking about IEC scale here) The only down side is that at 180 degrees the water could drain into the couch pit causing some grief there. Does anyone have any experience or ideas about this. We have never had a hose burst on any of our machines, but I could see how it could be a very bad thing to have happen. Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC Message-ID: <01C0A163.8E915FA0.satya.rajapakse@dchs.tas.gov.au> From: satya rajapakse Reply-To: satya.rajapakse@dchs.tas.gov.au To: "'Randy.McVittie@lrcc.on.ca'" , linac-eng@plato1.aristotle.net Subject: RE: Varian MLC Date: Tue, 27 Feb 2001 13:50:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy Varian recommendation is to park at 90.The opposing angle, 270,is not recommended due to the location of the collimator wind up cable connections, which could result in electrical damage. Now for parking at 180; one more reason for not parking at 180(IEC) is that apart from collecting the water in the "boat" it can interfere with room cleaning after hours. More details of this is covered in CTB-120 issued on 31st May 2000. Cheers Satya Satya B. Rajapakse W.P.Holman Clinic Launceston General Hospital Charles Street,Launceston Tasmania 7250, Australia Ph: 61 3 6348 7152 Fx: 61 3 6331 6371 E-mail: satya.rajapakse@dchs.tas.gov.au -----Original Message----- From: Randy.McVittie@lrcc.on.ca [SMTP:Randy.McVittie@lrcc.on.ca] Sent: Wednesday, 28 February 2001 4:56 To: linac-eng@plato1.aristotle.net Subject: Varian MLC Hello all: We are discussing where to leave the gantry at night on our MLC machines. I think I heard that Varian recommends 90 or 270, but we were thinking why not leave it at 180 degrees? And maybe put a drain hole in the canoe cover so that it water doesn't sit there. (I am talking about IEC scale here) The only down side is that at 180 degrees the water could drain into the couch pit causing some grief there. Does anyone have any experience or ideas about this. We have never had a hose burst on any of our machines, but I could see how it could be a very bad thing to have happen. Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Varian MLC Message-ID: <3AE23899EECFD411B2210008C7B2BF399F5090@wmhmail.whs.org> From: "Williams, Rod" To: "'Randy.McVittie@lrcc.on.ca'" , linac-eng@plato1.aristotle.net Subject: RE: Varian MLC Date: Tue, 27 Feb 2001 11:25:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Randy On our three 21ex linacs I have put a hole in the bottom of the boat and have added one to the collimator cover, this does two things one if there should be a leak like you said it dumps it on the floor and the one in the collimator cover helps the heat get out to keep the MLC electronics cooler and yes all machines are kept at 180 at night. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Randy.McVittie@lrcc.on.ca [SMTP:Randy.McVittie@lrcc.on.ca] > Sent: Tuesday, February 27, 2001 11:56 AM > To: linac-eng@plato1.aristotle.net > Subject: Varian MLC > > > > Hello all: > > We are discussing where to leave the gantry at night on our MLC machines. > I think I heard that Varian recommends 90 or 270, but we were thinking why > not > leave it at 180 degrees? > And maybe put a drain hole in the canoe cover so that it water doesn't sit > there. > (I am talking about IEC scale here) > > The only down side is that at 180 degrees the water could drain into the > couch > pit causing some grief there. > Does anyone have any experience or ideas about this. > > We have never had a hose burst on any of our machines, but I could see how > it > could be a very > bad thing to have happen. > > > Randy McVittie > London Regional Cancer Centre > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: rotary joint replacement --follow up Message-ID: From: "Moore, Lee" To: "'Linac-eng@plato1.aristotle.net'" Subject: rotary joint replacement --follow up Date: Tue, 27 Feb 2001 10:54:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks to all who responded with info regarding rf rotary joint removal/replacement. We positioned the couch close to the stand and removed the vac/ion power supply. We then constructed out of plywood a "couch extension board" and positioned it with one side within the stand and the other on the couch and adjusted couch vertical for best position. It was still a little tight but worked great. Best thing was no leaks! Thanks ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC Message-ID: <3A9BF904.F189C87A@scf.sk.ca> From: Scot Thiesson To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian MLC Date: Tue, 27 Feb 2001 10:59:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" See CTB-120 on the Varian web site. Randy.McVittie@lrcc.on.ca wrote: > Hello all: > > We are discussing where to leave the gantry at night on our MLC machines. > I think I heard that Varian recommends 90 or 270, but we were thinking why not > leave it at 180 degrees? > And maybe put a drain hole in the canoe cover so that it water doesn't sit > there. > (I am talking about IEC scale here) > > The only down side is that at 180 degrees the water could drain into the couch > pit causing some grief there. > Does anyone have any experience or ideas about this. > > We have never had a hose burst on any of our machines, but I could see how it > could be a very > bad thing to have happen. > > Randy McVittie > London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: Randy.McVittie@lrcc.on.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian MLC Date: Tue, 27 Feb 2001 11:04:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Randy; We understand that the latest thinking from Varian is to put the gantry at 90 degrees IEC and the collimator at 90 degrees. This positioning is meant to minimize the chances of water getting into electronics and the ion chambers. It also makes floor cleaning access a little easier. Len On Tue, 27 Feb 2001 12:55:35 -0500 Randy.McVittie@lrcc.on.ca wrote: > > > Hello all: > > We are discussing where to leave the gantry at night on our > MLC machines. I think I heard that Varian recommends 90 or > 270, but we were thinking why not leave it at 180 degrees? > And maybe put a drain hole in the canoe cover so that it > water doesn't sit there. > (I am talking about IEC scale here) > > The only down side is that at 180 degrees the water could > drain into the couch pit causing some grief there. > Does anyone have any experience or ideas about this. > > We have never had a hose burst on any of our machines, but > I could see how it could be a very > bad thing to have happen. > > > Randy McVittie > London Regional Cancer Centre > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian MLC Message-ID: <85256A00.006279A1.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: linac-eng@plato1.aristotle.net Subject: Varian MLC Date: Tue, 27 Feb 2001 09:55:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all: We are discussing where to leave the gantry at night on our MLC machines. I think I heard that Varian recommends 90 or 270, but we were thinking why not leave it at 180 degrees? And maybe put a drain hole in the canoe cover so that it water doesn't sit there. (I am talking about IEC scale here) The only down side is that at 180 degrees the water could drain into the couch pit causing some grief there. Does anyone have any experience or ideas about this. We have never had a hose burst on any of our machines, but I could see how it could be a very bad thing to have happen. Randy McVittie London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta Message-ID: From: Christian Knopper Reply-To: Christian.Knopper@LKH-klu.at To: linac-eng@plato1.aristotle.net Subject: Elekta Date: Tue, 27 Feb 2001 02:20:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello! I'm member of this news group now for approx. 3 month. Since this time I'am only reading about Siemens and Varian problems. Are there no Elekta/Philips users using this group? Christian Knopper Christian.Knopper@LKH-klu.at LKH-Klagenfurt Radiotherapy Dpt. AUSTRIA ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens KD2 Jaw A2 Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF961@phsexch6.partners.org> From: "Maddox, Buford J" To: "'BMic644@aol.com'" , linac-eng@plato1.aristotle.net Subject: RE: Siemens KD2 Jaw A2 Date: Mon, 26 Feb 2001 13:45:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Are you using the SIP analyzer on this? I wonder if you can set a trap to monitor this jaw? I am just getting into this, wonder if folks use it. Haven't seen your problem, good luck. > -----Original Message----- > From: BMic644@aol.com [SMTP:BMic644@aol.com] > Sent: Saturday, February 24, 2001 9:57 AM > To: linac-eng@plato1.aristotle.net > Subject: Re: Siemens KD2 Jaw A2 > > Hi Folks > Just an update on my A2 jaw problem. Changed the A1/A2 motor controller and > the problem went away for about 3 days. Friday morning, it was back again. > I will continue trouble shooting this problem. Also, this is one of those > problems that I cannot duplicate when working on the machine. > > Barry Michael > Saint Barnabas Medical Center > 908-238-1231 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600 C/D Gantry drive Assy Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF960@phsexch6.partners.org> From: "Maddox, Buford J" To: "'Villegas, Jose'" , 'Linear Accelereator submissions' Subject: RE: 600 C/D Gantry drive Assy Date: Mon, 26 Feb 2001 13:39:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Torque limiter is another name for the clutch, which is on the harmonic drive (transmission) shaft. > -----Original Message----- > From: Villegas, Jose [SMTP:VillegaJ@ummhc.org] > Sent: Friday, February 23, 2001 10:12 AM > To: 'Linear Accelereator submissions' > Subject: 600 C/D Gantry drive Assy > > Hi folks, > > 600 C/D S/N 492 Can anyone confirm if the Spring loaded Assy with the > sprocket chain drive (Gantry) > in the Harmonic Drive is also called Torque limiter (Part # C1100462-02)? > as > the book named it, the data book doesn't have a > front view of the Gantry drive Assy so I can't determine what they are > referring to with that name, and also > who would be a good source to get it from. > > thanks, > > Jose. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Picker-Zepher Message-ID: From: Steve Reliford To: linac-eng@plato1.aristotle.net Subject: Picker-Zepher Date: Mon, 26 Feb 2001 07:33:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" If the person looking for a Picker Zepher unit that is fully functional, we have one taking up space. If you are interested in the unit, please contact our Physics Department Director, Dave Asche. His phone number is (916) 454-6611. Thanks ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600 C/D Gantry drive Assy Message-ID: From: Jose Villegas To: cresskik@voyager.net, linac-eng@plato1.aristotle.net Subject: Re: 600 C/D Gantry drive Assy Date: Sat, 24 Feb 2001 14:12:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well the friction pads are worn out causing noise every time the gantry get to a stop, decided to replaced the torque limiter because wasn't sure if rebuilding it or replacing the pads and not following manufacturer torque spec (wish there is none in the data book) could cause some malfunction in the gantry drive mechanism, do you know if there is any spec available? Thanks, Jose Villegas. >From: "Jeff Cressman" >To: "Villegas, Jose" , "'Linear Accelereator submissions'" >Subject: Re: 600 C/D Gantry drive Assy >Date: Sat, 24 Feb 2001 01:45:57 -0500 > >Was wondering why you were looking to replace the entire torque limiter? > I have only seen two things fail on these. Sometimes the springs will break >or usually they just "slip" to much. I have not tried to second source a >spring so I can't say if it is possible. But if it is slipping, then that is >fixable. You should be able to get 2 new friction pads from somebody like >RadParts for real cheap. If not check with your local industrial supply >company, they are the same friction pads that were used on the old style >6/100 torque limiter which was a Morse Model 350A Torque Limiter. > >Hope this helps. >Jeff Cressman > > >----- Original Message ----- >From: "Villegas, Jose" >To: "'Linear Accelereator submissions'" >Sent: Friday, February 23, 2001 10:12 AM >Subject: 600 C/D Gantry drive Assy > > > > Hi folks, > > > > 600 C/D S/N 492 Can anyone confirm if the Spring loaded Assy with the > > sprocket chain drive (Gantry) > > in the Harmonic Drive is also called Torque limiter (Part # C1100462-02)? >as > > the book named it, the data book doesn't have a > > front view of the Gantry drive Assy so I can't determine what they are > > referring to with that name, and also > > who would be a good source to get it from. > > > > thanks, > > > > Jose. > > > _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens KD2 Jaw A2 Message-ID: <75.10b6118b.27c925b1@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: Siemens KD2 Jaw A2 Date: Sat, 24 Feb 2001 06:56:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks Just an update on my A2 jaw problem. Changed the A1/A2 motor controller and the problem went away for about 3 days. Friday morning, it was back again. I will continue trouble shooting this problem. Also, this is one of those problems that I cannot duplicate when working on the machine. Barry Michael Saint Barnabas Medical Center 908-238-1231 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600 C/D Gantry drive Assy Message-ID: <002001c09e2d$72358180$3fa199d1@thunderbird> From: Jeff Cressman To: "Villegas, Jose" , 'Linear Accelereator submissions' Subject: Re: 600 C/D Gantry drive Assy Date: Fri, 23 Feb 2001 22:45:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Was wondering why you were looking to replace the entire torque limiter? I have only seen two things fail on these. Sometimes the springs will break or usually they just "slip" to much. I have not tried to second source a spring so I can't say if it is possible. But if it is slipping, then that is fixable. You should be able to get 2 new friction pads from somebody like RadParts for real cheap. If not check with your local industrial supply company, they are the same friction pads that were used on the old style 6/100 torque limiter which was a Morse Model 350A Torque Limiter. Hope this helps. Jeff Cressman ----- Original Message ----- From: "Villegas, Jose" To: "'Linear Accelereator submissions'" Sent: Friday, February 23, 2001 10:12 AM Subject: 600 C/D Gantry drive Assy > Hi folks, > > 600 C/D S/N 492 Can anyone confirm if the Spring loaded Assy with the > sprocket chain drive (Gantry) > in the Harmonic Drive is also called Torque limiter (Part # C1100462-02)? as > the book named it, the data book doesn't have a > front view of the Gantry drive Assy so I can't determine what they are > referring to with that name, and also > who would be a good source to get it from. > > thanks, > > Jose. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Gear Reducer Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "Kloster, Stephen" Cc: linac-eng@plato1.aristotle.net Subject: Varian Gear Reducer Date: Fri, 23 Feb 2001 11:52:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Stephen; Harmonic Drive Technologies, Peabody, MA, Zip 01960. Model ISR-IM 200:1 ratio. If you dismantle the gearbox you may find that dirt, metal grindings etc. have filled the small Clearances between the internal and external gear teeth thus causing slippage. If things aren't too badly worn out a thorough cleaning and re-lubricating with grease may keep you on line until you can get a replacement. These are very interesting gear reduction units that use an externally toothed gear wheel rolling around inside an internally toothed drum...the difference in the number of teeth between the inner wheel and the outer drum causes the inner wheel to lose a small angle of rotation each time the outer drum rotates once...the inner wheels eccentric motion is coupled back to the output shaft via a pair of pins in slide tracks. Good luck. Len On Fri, 23 Feb 2001 07:48:13 -0500 "Kloster, Stephen" wrote: > Greetings, > > Our Varian 2100C/D s/n 638 is having some trouble with > gantry rotation. Has anyone found a manufacturer and/or > manufacturer's part number for the gearbox coupled to the > gantry rotate drive motor ? The Varian part no. is > 20-800007. Ours does not have any visible identifying > marks. Thanks in advance for any assistance. > Regards, Steve Kloster > Kingston RCC ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600 C/D Gantry drive Assy Message-ID: From: Joseph Czarnecki To: linac-eng@plato1.aristotle.net, VillegaJ@ummhc.org Subject: Re: 600 C/D Gantry drive Assy Date: Fri, 23 Feb 2001 07:59:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" yes, that is the part number. I had to buy one recently for a CL-6/100. the last cost was $658.00. Joseph M. Czarnecki Radiology & Imaging System Specialist III BJC Health Systems Clinical Engineering St. Louis, Missouri 63110 USA Work Telephone: 314.454.7101 email: joecz99@netzero.net jxc5307@bjc.org >>> "Villegas, Jose" 02/23/01 09:12AM >>> Hi folks, 600 C/D S/N 492 Can anyone confirm if the Spring loaded Assy with the sprocket chain drive (Gantry) in the Harmonic Drive is also called Torque limiter (Part # C1100462-02)? as the book named it, the data book doesn't have a front view of the Gantry drive Assy so I can't determine what they are referring to with that name, and also who would be a good source to get it from. thanks, Jose. ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; name="Joseph Czarnecki.vcf" Content-Disposition: attachment; filename="Joseph Czarnecki.vcf" BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Joseph Czarnecki TEL;WORK:454-7101 ORG:;Clinical Engineering TEL;PREF;FAX:747-4617 EMAIL;WORK;PREF;NGW:jxc5307@bjc.org N:Czarnecki;Joseph TITLE:RissII X-GWUSERID:jxc5307 END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Gear Reducer Message-ID: <001301c09dad$f6acd9c0$6701a8c0@jeffscruggs> From: Jeff Scruggs To: Stephen.Kloster@krcc.on.ca, linac-eng@plato1.aristotle.net Subject: Varian Gear Reducer Date: Fri, 23 Feb 2001 07:33:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Steve I see your looking for a Harmonic Drive part number 20-800007. We here at RadParts have the item in stock. Feel free to give us a call if you need one. Jeff Scruggs RadParts.com voice:877.704.3838 email:jeff@radparts.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <725E0331330BD4119A0500062905E2B9164934@beatrice.trcc.org> From: "Hughes, William H." To: "'linac-eng@plato1.aristotle.net'" Subject: Date: Fri, 23 Feb 2001 07:25:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, If there are any facilities with-in the USA that are currently treating with IMRT and would be willing to discuss their billing procedures with us we are in the planning stages of getting and using IMRT. Our staff has inquired as to the proper billing and code usages in order to prepare. If your chief therapist would have the time please have them contact me at (814) 838-0408. Thank you in advance. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 600 C/D Gantry drive Assy Message-ID: <351F39924BC5D311A35C0050DA2AC9B0065861@hcunivexch03.ummhc.org> From: "Villegas, Jose" To: 'Linear Accelereator submissions' Subject: 600 C/D Gantry drive Assy Date: Fri, 23 Feb 2001 07:12:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi folks, 600 C/D S/N 492 Can anyone confirm if the Spring loaded Assy with the sprocket chain drive (Gantry) in the Harmonic Drive is also called Torque limiter (Part # C1100462-02)? as the book named it, the data book doesn't have a front view of the Gantry drive Assy so I can't determine what they are referring to with that name, and also who would be a good source to get it from. thanks, Jose. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: JOB DESCRIPTION Message-ID: <3A967A95.14ABFCB7@ieee.org> From: DP To: Engineers Subject: JOB DESCRIPTION Date: Fri, 23 Feb 2001 06:58:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would appreciate receiving a job description for an in house linac service engineer from anyone who has access to such a document. -- Darrell O. Poole Senior Physicist M.D. Anderson Cancer Center Orlando 407.628.0991 407.721.2658 CELL 407.628,8463 FAX dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Gear Reducer Message-ID: <003201c09da2$2b8e9040$2d66aec7@techop.com> From: technical options To: "Kloster, Stephen" , linac-eng@plato1.aristotle.net Subject: Re: Varian Gear Reducer Date: Fri, 23 Feb 2001 06:08:56 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Stephen, You are talking about the harmonic drive, made by (of all people) Harmonic Drive. Their number is ISR-1M-200-0GP. This is an item that we keep in stock. If you need to order one, we'd be thrilled to sell one to you. Respectfully, Lisa Przepasniak Technical Options of Georgia, Inc. (800) 755-9640 lisa@technicaloptions.com ----- Original Message ----- From: Kloster, Stephen To: Sent: Friday, February 23, 2001 7:48 AM Subject: Varian Gear Reducer > Greetings, > > Our Varian 2100C/D s/n 638 is having some trouble with gantry > rotation. Has anyone found a manufacturer and/or manufacturer's part > number for the gearbox coupled to the gantry rotate drive motor ? The > Varian part no. is 20-800007. Ours does not have any visible > identifying marks. Thanks in advance for any assistance. > > Regards, > Steve Kloster > Kingston RCC ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Free to good home Message-ID: <6b.10401692.27c7c6fa@aol.com> From: Steersdad@aol.com To: linac-eng@plato1.aristotle.net Subject: Free to good home Date: Fri, 23 Feb 2001 06:00:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Friends, This is a very important message to any of you who are caretaking GE MAXIMAR 250kV orthovoltage x-ray therapy systems. We are removing a system from a calibration lab in the mid-south US within the next couple of weeks. This system comes complete with a complete, spare system. Our customer has agreed to allow us to give these two systems to whomever would like them. These two systems should provide several lifetimes worth of spare parts. Both systems are available at no cost. You pay the freight charges, or show up in a suitable truck, and you will be set for spares. Please contact me directly if you are interested. Of course, there is no warranty, guarantee, etc. Doug Steers Danbury Engineering Co. x-raytherapy.com Inc. Tel: 203-797-9181 FAX: 203-790-9529 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Gear Reducer Message-ID: <20DB4DB30001D51191E2006067368C971AB91E@NT_KRCC-2> From: "Kloster, Stephen" To: linac-eng@plato1.aristotle.net Subject: Varian Gear Reducer Date: Fri, 23 Feb 2001 04:48:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings, Our Varian 2100C/D s/n 638 is having some trouble with gantry rotation. Has anyone found a manufacturer and/or manufacturer's part number for the gearbox coupled to the gantry rotate drive motor ? The Varian part no. is 20-800007. Ours does not have any visible identifying marks. Thanks in advance for any assistance. Regards, Steve Kloster Kingston RCC ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SV: Vidar VXR-12 Diagnostic Film digitizer (scanner) Message-ID: From: Viking Eilert To: magnus.jalmbrant@radfys.umu.se Cc: linac-eng@plato1.aristotle.net Subject: SV: Vidar VXR-12 Diagnostic Film digitizer (scanner) Date: Fri, 23 Feb 2001 02:02:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Magnus We have had exactly the same equipment and problems and have done a lot = of troubleshouting/configuration changes. We ended up reinstalling win NT = and it worked fine after that, because it=B4s important that the right = drivers is installed correctly. You can try to NOT install EZ-SCSI and only = install the drivers from VIDAR. (We have had a lot of problems with the SCSI-cable and the terminator. = Try changing them). Another thing to remember is: Turn off everything COMPLETELY. Turn on = the scanner and wait maybe 30 s. THEN turn on the PC. You can scan the SCSI bus from the adaptec bios program. (Press ctrl-a during boot). If you can se the adapter and the scanner at the right = scsi id=B4s there I think there is something wrong with the NT driver = installation. I don=B4t think the configuration of the adaptec 2940 is the problem = here but it is a little bit tricky: (Host adapter SCSI id =3D7) VXR12 scsi id =3D 0 (,1,2,...6) Scsi parity checking: disabled Scsi termination: auto Initiate sync negotiation: no Maximum sync transfer rate: 5 MB/s Send start unit command: no Plug and play scam support: disable (host adapter: disable) Feel free to contact me again if you want. Good luck Eilert Universitetssjukhuset i Link=F6ping Eilert Viking O-centrum telefon: +46-13 222805 Radiofysikavdelningen fax: +46-13 222895 Sjukhusfysik Eilert.Viking@lio.se S-581 85 Link=F6ping http://www.lio.se Sverige telefon: +46-13 222000 > -----Ursprungligt meddelande----- > Fr=E5n: Magnus Jalmbrant [SMTP:magnus.jalmbrant@radfys.umu.se] > Skickat: den 23 februari 2001 10:12 > Till: linac-eng@plato1.aristotle.net > =C4mne: Vidar VXR-12 Diagnostic Film digitizer (scanner) > > Hi everyone! > > Is there anybody running a system including a Vidar VXR-12 Scanner? > If so, I have the following problem: > I can=B4t get it working in a PC environment, reinstalled the = connected PC > this week whereupon the scanner "ceased" to function properly. The = scanner > is connected to our TMS (Treatment planning) system and works fine = from > there. The SCSI interface in the PC is adaptec:s AHA-2940 and it = detects > the scanner OK, but when starting WINNT the SCSI unit contains = eight!! > connected Vidar VXR-12 units. I=B4ve installed the latest drivers for = the > SCSI card as well as the latest TWAIN drivers (required to run the = Vidar > scanner...). > The problem is probably something with the configuration but I = can=B4t > figure out exactly what! > > Regards > > Magnus J=E4lmbrant > Department of Radiation Physics > Norrlands University Hospital > Ume=E5 > Sweden > <> ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: RE: MLC collision Message-ID: <04ce75249081721GREEN@green.mcis.hutchcity.com> From: Maryoko Tosillio To: linac-eng@plato1.aristotle.net Subject: RE: RE: MLC collision Date: Fri, 23 Feb 2001 00:49:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What happens when the controller suddenly loses either the primary or secondary position information while a particular leaf is extending? Just wonder if this would be the case. Surely not a cal problem; it won't crash the screw that bad. MT -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: tcullen@wfubmc.edu;Steven.deBoer@roswellpark.org CC: linac-eng@plato1.aristotle.net Date: Fri, 23 Feb 2001 08:02:33 +0100 Subject: RE: MLC collision Hi Tim and others, I also disagree it is a calibration problem. Some years ago for months we were suffering of leafcollisions. Almost ten times we had to renew bended or broken leaf screws. It turned out to be taxi-errors, steering the MLC-head into strange shapes. I dont think Stevens problem is the same, but it is worth to check inbound/outbound counts right after the crash. Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl > -----Original Message----- > From: tcullen@wfubmc.edu [SMTP:tcullen@wfubmc.edu] > Sent: Wednesday, February 21, 2001 11:06 PM > To: deBoer, Steven > Cc: linac-eng@plato1.aristotle.net > Subject: Re: MLC collision > > Steven, I've had this happen on a Varian 80 leaf MLC here. Still very much > a > mystery, but I suspected at the time the control for the carriage was the > problem. This could have been either on the motor driver or the > transceiver. I > figured either there was a failure with the direction signal or the > braking > signal to the carriage. Could have been as simple as cabling, but I never > felt > like I solved that problem. I fixed it by replacing the motor > driver/transceiver pcbs and checking all the connections. To the ones who > think > this is a calibration problem, I'll disagree. This is a catastrophic > failure in > the sense that the drive control loses track of where it is and does not > stop > till it drives the opposing side all the way out the back. It's either > that or > the motor drive, crash brake, and direction control all get hosed and > drive out > of control. > If you come up with a solid cause as to why this happened, or if you can > reproduce it, I would like to know. > > > > "deBoer, Steven" wrote: > > > We have a 52 leaf Varian MLC on a clinac 2100CD. The other morning the > on > > the fourth or fifth MLC shape of the day one of the leaves (26A) crashed > > into the opposing leaf and sheered of the screws that hold the bracket > for > > the opposing motor. This left leaf 26A fully extended. Upon repair, the > > secondary feedback boards were switched and multiple leaf patterns were > set > > with no problem. This morning the same problem occurred with leaf 1a > fully > > extended and motor 1b knocked out. > > > > Has anyone else experienced this? > > Is this a board problem or maybe a software problem? > > Any ideas as to the cause would be appreciated. > > > > Steven de Boer ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: FAQ list for Elekta accelerators Message-ID: From: Jan Kok To: 'Linac eng' Subject: FAQ list for Elekta accelerators Date: Fri, 23 Feb 2001 00:51:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning lads, The next version of the FAQ list for Elekta accelerator engineers is now available on the Internet. This version is equiped with a search engine to improve accessibility. >From the start, about eight months ago there were 1150 visitors. Some large numbers of visitors were registered at the introduction. Later there ware about 15 visitors per week. This and some nice email's are a good motivation for me to continue with this service. Feel free to send me your critics and / or contributions. Also corrections on my spelling (message and massage are not the same as I have noticed) are welcome. http://www.isi.uu.nl/radiotherapy/linaceng/index.html Regards Jan Kok ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Vidar VXR-12 Diagnostic Film digitizer (scanner) Message-ID: <001401c09d73$16ba1e70$4d5611c2@us.vll.se> From: =?iso-8859-1?Q?Magnus_J=E4lmbrant?= To: linac-eng@plato1.aristotle.net Subject: Vidar VXR-12 Diagnostic Film digitizer (scanner) Date: Fri, 23 Feb 2001 00:32:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi everyone! =20 Is there anybody running a system including a Vidar VXR-12 Scanner? If so, I have the following problem: I can=B4t get it working in a PC environment, reinstalled the connected = PC this week whereupon the scanner "ceased" to function properly. The = scanner is connected to our TMS (Treatment planning) system and works fine from there. The SCSI interface in the PC is adaptec:s AHA-2940 and it = detects the scanner OK, but when starting WINNT the SCSI unit contains eight!! = connected Vidar VXR-12 units. I=B4ve installed the latest drivers for the SCSI = card as well as the latest TWAIN drivers (required to run the Vidar = scanner...). The problem is probably something with the configuration but I can=B4t = figure out exactly what! =20 Regards =20 Magnus J=E4lmbrant Department of Radiation Physics Norrlands University Hospital Ume=E5 Sweden ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Job Posting: Field Service Engineer Message-ID: <00b601c09d37$d3b9b8a0$0100a8c0@mshome.net> From: Domenic Greco To: linac-eng@plato1.aristotle.net Subject: Job Posting: Field Service Engineer Date: Thu, 22 Feb 2001 17:27:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Job Posting (Posted at HotJobs.com 1/23/2001) RADIATION ELECTRONICS, INC. Field Service Engineer Openings for San Jose, CA. and Riverside, CA. 2/22/2001 Radiation Electronics, a Medical Equipment Service Company specializing in the installation and service of radiation therapy equipment, has openings for Field Service Engineers in Northern and Southern California. Candidates will be responsible for the troubleshooting, repair, and preventive maintenance of diagnostic x-ray and radiation therapy equipment located within hospital and clinics in the territory of coverage. Good electro-mechanical and electronic skills, and knowledge of RF microwave systems are required. The successful candidate will also work well independently and interact well with customers. EDUCATION: AS degree or equivalent military training in electronics. EXPERIENCE with diagnostic x-ray or with Varian, Siemens, or Electa linear accelerators desirable. Salary is commensurate with experience. We offer excellent compensation including commissions; a complete benefits package, and a company vehicle. 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------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: MLC collision Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: tcullen@wfubmc.edu, Steven.deBoer@roswellpark.org Cc: linac-eng@plato1.aristotle.net Subject: RE: MLC collision Date: Thu, 22 Feb 2001 23:02:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Tim and others, I also disagree it is a calibration problem. Some years ago for months we were suffering of leafcollisions. Almost ten times we had to renew bended or broken leaf screws. It turned out to be taxi-errors, steering the MLC-head into strange shapes. I dont think Stevens problem is the same, but it is worth to check inbound/outbound counts right after the crash. Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl > -----Original Message----- > From: tcullen@wfubmc.edu [SMTP:tcullen@wfubmc.edu] > Sent: Wednesday, February 21, 2001 11:06 PM > To: deBoer, Steven > Cc: linac-eng@plato1.aristotle.net > Subject: Re: MLC collision > > Steven, I've had this happen on a Varian 80 leaf MLC here. Still very much > a > mystery, but I suspected at the time the control for the carriage was the > problem. This could have been either on the motor driver or the > transceiver. I > figured either there was a failure with the direction signal or the > braking > signal to the carriage. Could have been as simple as cabling, but I never > felt > like I solved that problem. I fixed it by replacing the motor > driver/transceiver pcbs and checking all the connections. To the ones who > think > this is a calibration problem, I'll disagree. This is a catastrophic > failure in > the sense that the drive control loses track of where it is and does not > stop > till it drives the opposing side all the way out the back. It's either > that or > the motor drive, crash brake, and direction control all get hosed and > drive out > of control. > If you come up with a solid cause as to why this happened, or if you can > reproduce it, I would like to know. > > > > "deBoer, Steven" wrote: > > > We have a 52 leaf Varian MLC on a clinac 2100CD. The other morning the > on > > the fourth or fifth MLC shape of the day one of the leaves (26A) crashed > > into the opposing leaf and sheered of the screws that hold the bracket > for > > the opposing motor. This left leaf 26A fully extended. Upon repair, the > > secondary feedback boards were switched and multiple leaf patterns were > set > > with no problem. This morning the same problem occurred with leaf 1a > fully > > extended and motor 1b knocked out. > > > > Has anyone else experienced this? > > Is this a board problem or maybe a software problem? > > Any ideas as to the cause would be appreciated. > > > > Steven de Boer ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: MLC collision Message-ID: From: "Orsolini, Joe D" To: "'deBoer, Steven'" , linac-eng@plato1.aristotle.net Subject: RE: MLC collision Date: Thu, 22 Feb 2001 05:56:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" its really suspicious since its the first leaves and the last leaves, most likely the ribbon cable on the A side is loose, we had the same problem on our 2300CD > -----Original Message----- > From: deBoer, Steven [SMTP:Steven.deBoer@roswellpark.org] > Sent: Wednesday, February 21, 2001 13:40 > To: linac-eng@plato1.aristotle.net > Subject: MLC collision > > We have a 52 leaf Varian MLC on a clinac 2100CD. The other morning the on > the fourth or fifth MLC shape of the day one of the leaves (26A) crashed > into the opposing leaf and sheered of the screws that hold the bracket for > the opposing motor. This left leaf 26A fully extended. Upon repair, the > secondary feedback boards were switched and multiple leaf patterns were > set > with no problem. This morning the same problem occurred with leaf 1a > fully > extended and motor 1b knocked out. > > Has anyone else experienced this? > Is this a board problem or maybe a software problem? > Any ideas as to the cause would be appreciated. > > > Steven de Boer > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: MLC collision Message-ID: <3AE23899EECFD411B2210008C7B2BF399F508B@wmhmail.whs.org> From: "Williams, Rod" To: 'Jose Villegas' , lenj@CancerBoard.ab.ca, linac-eng@plato1.aristotle.net Subject: RE: MLC collision Date: Thu, 22 Feb 2001 04:26:46 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I know if this was a 120 the first thing to do would be a recal, this fixes 90% of the leave crash problems. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Jose Villegas [SMTP:villegaj@hotmail.com] > Sent: Wednesday, February 21, 2001 3:19 PM > To: lenj@CancerBoard.ab.ca; linac-eng@plato1.aristotle.net > Subject: Re: MLC collision > > > > > > > > > > > > > > > Steven : > > It looks like you have Skewed problems since leaves are crashing at > either end. > > try swapping the motor driver(most likely to be faulty for this type of > problem ) and Head Txc PCB. > > Good luck. > > Jose. > > >From: "Leonard C. Johnson" > > >Reply-To: lenj@CancerBoard.ab.ca > >To: "deBoer, Steven" > >CC: linac-eng@plato1.aristotle.net > >Subject: Re: MLC collision > >Date: Wed, 21 Feb 2001 12:11:55 -0700 (Mountain Standard Time) > > > >Steven; > >Several things come to mind: > >The leaves must be able to retract away from the opposing > >leaves when shapes are being changed. It is important that > >there be no binding, no excessive motor currents, etc. Have > >you checked all of the motor currents? Also has anyone > >checked the end gap, offset, and skew adjustments? > >Sometimes the problems had difficult to see during a repair > >session unless auto-sequencing is used. > >Good luck. > >Len > > > >On Wed, 21 Feb 2001 13:39:50 -0500 "deBoer, Steven" > > wrote: > > > > > We have a 52 leaf Varian MLC on a clinac 2100CD. The other > > > morning the on the fourth or fifth MLC shape of the day one > > > of the leaves (26A) crashed into the opposing leaf and > > > sheered of the screws that hold the bracket for the > > > opposing motor. This left leaf 26A fully extended. Upon > > > repair, the secondary feedback boards were switched and > > > multiple leaf patterns were set with no problem. This > > > morning the same problem occurred with leaf 1a > > > fully extended and motor 1b knocked out. > > > > > > Has anyone else experienced this? > > > Is this a board problem or maybe a software problem? Any > > > ideas as to the cause would be appreciated. > > > > > > > > > Steven de Boer > > > > > > > > > >---------------------- > >Leonard C. Johnson > >lenj@cancerboard.ab.ca > > > > _____ > > Get your FREE download of MSN Explorer at > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Lantis Error 90... Siemens imput. Message-ID: <00BE56E17E26D11197CB00805FA6803A04FAC30B@pn_nt1.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Lantis Error 90... Siemens imput. Date: Wed, 21 Feb 2001 15:05:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Andre & Other Lantis Users, Interestingly.... Siemens have read your reply, as it was posted to the linac list server, and not just me. Siemens stated via a phone call to our department (shortly afterwards), that should we perform this alteration then they will NO longer provide support to us. As I am reluctant to sever my support from Siemens, I suspect I cannot undertake your recommendations. Hopefully Siemens will provide a solution to our problem. This problem has been noted on our Lantis system now for more than three months... hence the reason to search for other peoples solutions/suggestions. All that is left I guess, is to report how/when we solution is performed - should anyone be interested. Keith, Palerston North New Zealand. -----Original Message----- From: andrer@health.nb.ca [mailto:andrer@health.nb.ca] Sent: Thursday, February 22, 2001 12:45 AM To: LinacEng (E-mail) Subject: Re: Lantis Keith Croft and others, I have done a great deal of work in this regard, hospital IT dept sometimes do not far enough. So here it is, full proof solution to a happy LANTIS. Get rid of IPX/SPX EVERYWHERE, BAD PROTOCOL! We have been working under this solution since last October without a problem. {Snipped the bulk of Andre's email....} Have a good day everyone, Andre Robichaud Moncton NB Canada ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MLC collision Message-ID: <3A943BE6.50A70404@wfubmc.edu> From: tcullen@wfubmc.edu To: "deBoer, Steven" Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC collision Date: Wed, 21 Feb 2001 14:06:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Steven, I've had this happen on a Varian 80 leaf MLC here. Still very much a mystery, but I suspected at the time the control for the carriage was the problem. This could have been either on the motor driver or the transceiver. I figured either there was a failure with the direction signal or the braking signal to the carriage. Could have been as simple as cabling, but I never felt like I solved that problem. I fixed it by replacing the motor driver/transceiver pcbs and checking all the connections. To the ones who think this is a calibration problem, I'll disagree. This is a catastrophic failure in the sense that the drive control loses track of where it is and does not stop till it drives the opposing side all the way out the back. It's either that or the motor drive, crash brake, and direction control all get hosed and drive out of control. If you come up with a solid cause as to why this happened, or if you can reproduce it, I would like to know. "deBoer, Steven" wrote: > We have a 52 leaf Varian MLC on a clinac 2100CD. The other morning the on > the fourth or fifth MLC shape of the day one of the leaves (26A) crashed > into the opposing leaf and sheered of the screws that hold the bracket for > the opposing motor. This left leaf 26A fully extended. Upon repair, the > secondary feedback boards were switched and multiple leaf patterns were set > with no problem. This morning the same problem occurred with leaf 1a fully > extended and motor 1b knocked out. > > Has anyone else experienced this? > Is this a board problem or maybe a software problem? > Any ideas as to the cause would be appreciated. > > Steven de Boer ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MLC collision Message-ID: From: Jose Villegas To: lenj@CancerBoard.ab.ca, linac-eng@plato1.aristotle.net Subject: Re: MLC collision Date: Wed, 21 Feb 2001 13:19:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Steven : It looks like you have Skewed problems since leaves are crashing at either end. try swapping the motor driver(most likely to be faulty for this type of problem ) and Head Txc PCB. Good luck. Jose. >From: "Leonard C. Johnson" >Reply-To: lenj@CancerBoard.ab.ca >To: "deBoer, Steven" >CC: linac-eng@plato1.aristotle.net >Subject: Re: MLC collision >Date: Wed, 21 Feb 2001 12:11:55 -0700 (Mountain Standard Time) > >Steven; >Several things come to mind: >The leaves must be able to retract away from the opposing >leaves when shapes are being changed. It is important that >there be no binding, no excessive motor currents, etc. Have >you checked all of the motor currents? Also has anyone >checked the end gap, offset, and skew adjustments? >Sometimes the problems had difficult to see during a repair >session unless auto-sequencing is used. >Good luck. >Len > >On Wed, 21 Feb 2001 13:39:50 -0500 "deBoer, Steven" > wrote: > > > We have a 52 leaf Varian MLC on a clinac 2100CD. The other > > morning the on the fourth or fifth MLC shape of the day one > > of the leaves (26A) crashed into the opposing leaf and > > sheered of the screws that hold the bracket for the > > opposing motor. This left leaf 26A fully extended. Upon > > repair, the secondary feedback boards were switched and > > multiple leaf patterns were set with no problem. This > > morning the same problem occurred with leaf 1a > > fully extended and motor 1b knocked out. > > > > Has anyone else experienced this? > > Is this a board problem or maybe a software problem? Any > > ideas as to the cause would be appreciated. > > > > > > Steven de Boer > > > > > >---------------------- >Leonard C. Johnson >lenj@cancerboard.ab.ca > _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: MLC collision Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "deBoer, Steven" Cc: linac-eng@plato1.aristotle.net Subject: Re: MLC collision Date: Wed, 21 Feb 2001 11:11:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Steven; Several things come to mind: The leaves must be able to retract away from the opposing leaves when shapes are being changed. It is important that there be no binding, no excessive motor currents, etc. Have you checked all of the motor currents? Also has anyone checked the end gap, offset, and skew adjustments? Sometimes the problems had difficult to see during a repair session unless auto-sequencing is used. Good luck. Len On Wed, 21 Feb 2001 13:39:50 -0500 "deBoer, Steven" wrote: > We have a 52 leaf Varian MLC on a clinac 2100CD. The other > morning the on the fourth or fifth MLC shape of the day one > of the leaves (26A) crashed into the opposing leaf and > sheered of the screws that hold the bracket for the > opposing motor. This left leaf 26A fully extended. Upon > repair, the secondary feedback boards were switched and > multiple leaf patterns were set with no problem. This > morning the same problem occurred with leaf 1a > fully extended and motor 1b knocked out. > > Has anyone else experienced this? > Is this a board problem or maybe a software problem? Any > ideas as to the cause would be appreciated. > > > Steven de Boer > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MLC collision Message-ID: From: "deBoer, Steven" To: linac-eng@plato1.aristotle.net Subject: MLC collision Date: Wed, 21 Feb 2001 10:39:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a 52 leaf Varian MLC on a clinac 2100CD. The other morning the on the fourth or fifth MLC shape of the day one of the leaves (26A) crashed into the opposing leaf and sheered of the screws that hold the bracket for the opposing motor. This left leaf 26A fully extended. Upon repair, the secondary feedback boards were switched and multiple leaf patterns were set with no problem. This morning the same problem occurred with leaf 1a fully extended and motor 1b knocked out. Has anyone else experienced this? Is this a board problem or maybe a software problem? Any ideas as to the cause would be appreciated. Steven de Boer ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Lantis Message-ID: <3A93AA41.B3CAD87A@health.nb.ca> From: andrer@health.nb.ca Reply-To: andrer@health.nb.ca To: "LinacEng (E-mail)" Subject: Re: Lantis Date: Wed, 21 Feb 2001 03:45:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Keith Croft and others, I have done a great deal of work in this regard, hospital IT dept sometimes do not far enough. So here it is, full proof solution to a happy LANTIS. Get rid of IPX/SPX EVERYWHERE, BAD PROTOCOL! We have been working under this solution since last October without a problem. We have a KDS2 and MXE2 Siemens Mevatrons and five other workstations and we are hooked up to the hospital network. Intermittent problems with IPX/SPX protocol. Procedure when all files including SEQAFS.pif and SEQAFS.bat are located on server LANTIS directory. For reference see Pervasive instructions at pvsw\clients\dos\tcp\readme.txt. AT EACH NT WORKSTATION( have not tested it on WIN95, but I would not run LANTIS on it anyway: give administrator's rights to lantis user and logon as lantis Copy: JSBDOSWS.EXE JSBDOSWS.DLL MSOCKLIB.RC VSLDOS.WNT BREQTCP.EXE BREQTCP.DLL to %SystemRoot%\system directory Renamed VSLDOS.WNT to VSLDOS.INI Edit impac.ini and and properly edit the pif name for this workstation i.e. SEQName=SEQtcpM.pif Select Control Panel, System, Environment tab Add and Set env variable VSL=%SystemRoot%\System Add %SystemRoot%\System; to path AT SERVER: I created a pif and bat file for each workstation separately, leaving the originals intact. The SEQAFS.pif becomes SEQtcpM.pif for the MXE2 Mevatron; the SEQAFS.pif becomes SEQtcpK.pif for the KDS2 Mevatron The SEQtcp*.pif points to SEQtcp*.bat Edit each SEQtcp*.bat as follows: @Echo Off If "%VMI%"=="66" Philip75 If "%VMI%"=="69" Mev67 If "%VMI%"=="70" Mevatron If "%VMI%"=="71" MevMLC If "%VMI%"=="74" Clinac If "%VMI%"=="75" ClinMLC If "%VMI%"=="66" Philip75 If "%VMI%"=="77" P75Asu Bstop jsbdosws BreqTCP /d:20000 SEQ.EXE Bstop VMIUnld Remove all IPX/SPX protocol at workstations & server. Also remove IPX/SPX from Pervasive. Have a good day everyone, Andre Robichaud Moncton NB Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens KD2 Message-ID: <200102211046.LAA19971@pluto-qe0.az.vub.ac.be> From: Iwein Van de Vondel Reply-To: Iwein Van de Vondel To: linac-eng@plato1.aristotle.net Subject: Re: Siemens KD2 Date: Wed, 21 Feb 2001 03:42:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello Barry, A few years ago we had the same problem with our Mevatron. In the morning a 10x10 field ( so A2 was 5cm) was displayed , but when measuring A2 is was 8.5 cm from the center. When the PS-switch was turned off and on (to put a board on extension) the problem was gone. We measured different points in the following path : Potmeter voltage ( 0V - 10V) - V/F-converter (G41 PC2) ( 0Hz - 500kHz) - Motor control (G31 PC5,PC6) - Slave 0 . The problem was an OPAMP on the V/F-board ( U6 (OP400) on G41 PC2). We could measure a wrong JAW A2 Vref2 voltage on U6-8 ( or across the potmeter). To find this problem we added some reachable measure points so we could measure without switching off PS-switch. Hope this will help you, Regards, Iwein ***************************************** * Iwein Van de Vondel * * Engineer Radiotherapy * * AZ VUB * * Laarbeeklaan 101 * * 1090 Brussel * * BELGIUM * ***************************************** > X-Authentication-Warning: plato1.aristotle.net: majordomo set sender to owner-linac-eng@plato.aristotle.net using -f > From: BMic644@aol.com > Date: Tue, 20 Feb 2001 10:20:00 EST > Subject: Siemens KD2 > To: linac-eng@plato1.aristotle.net > MIME-Version: 1.0 > Content-Transfer-Encoding: 7bit > > Have an interesting problem with Jaw readouts. When the machine is powered > up in the morning, we have an A2 jaw fault with the jaw light field showing > 12 cm from collimator center and the readout claims it is at 5 cm. At this > point you can calibrate the A jaws and it is OK for the rest of the treatment > day. Also, you can just power down the machine and bring it back up and move > the jaws to a 10x10 field and everything is OK without calibrating the jaw > readout. At the end of the treatment day, the night crew leaves the jaw > settings for a 10x10 field but jaw A2 moves to the 12 cm setting during the > initial power up sequence. > > We have changed the jaw A pots. Calibration has been done several times. It > will be interesting to see the responses for this problem. Thank you in > advance for all the help on this one. > > Barry Michael > Saint Barnabas Health Care System > Livingston, NJ > 908-238-1231 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens KD2 Message-ID: <001701c09be3$56a85dd0$cb0ba4cb@co3006194a> From: Francis Tiss To: BMic644@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: Siemens KD2 Date: Wed, 21 Feb 2001 00:50:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Barry, Do you get an A2 Jaw motion interlock? If you do, you got to be very careful as this interlock can be cleared with a left hand key reset and continue treatment with a wrong field size. We had a similar problem sometime ago but in our case the readout changed again during the day . We replaced the A to D PCB in G42, I haven't got my manuals with me right now, but if I am not mistaken it was PC2. Regards Francis Tiss Medtech Solutions Australia ----- Original Message ----- From: To: Sent: Wednesday, February 21, 2001 2:20 AM Subject: Siemens KD2 > Have an interesting problem with Jaw readouts. When the machine is powered > up in the morning, we have an A2 jaw fault with the jaw light field showing > 12 cm from collimator center and the readout claims it is at 5 cm. At this > point you can calibrate the A jaws and it is OK for the rest of the treatment > day. Also, you can just power down the machine and bring it back up and move > the jaws to a 10x10 field and everything is OK without calibrating the jaw > readout. At the end of the treatment day, the night crew leaves the jaw > settings for a 10x10 field but jaw A2 moves to the 12 cm setting during the > initial power up sequence. > > We have changed the jaw A pots. Calibration has been done several times. It > will be interesting to see the responses for this problem. Thank you in > advance for all the help on this one. > > Barry Michael > Saint Barnabas Health Care System > Livingston, NJ > 908-238-1231 > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Lantis Message-ID: <00BE56E17E26D11197CB00805FA6803A04FAC2F5@pn_nt1.midcentral.co.nz> From: Keith Croft To: "'andrer@health.nb.ca'" Cc: "LinacEng (E-mail)" Subject: RE: Lantis Date: Tue, 20 Feb 2001 13:18:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks from the people who have replied, I have replied to most directly... but by the sounds of we are not the only poeple to see this problem, so I thought I would email this reply to fill in others of what our situation is: OK, I have not spent a great deal of time working with the Lantis, rather the Hospital IT people have and seem to be coming up with no solutions, hence the reason for the posting. But in an attempt to answer your questions: 1. WinNT on the linacs, and Simulator. Win95 on the other machines around the department. All can get the error 90. 2. The server is a WinNT machine. 3. The linacs are Varian 2100C & a Varian 600C. 4. No its not network traffic, as we have tried playing with things at night when we know the network traffic is very light, and we still get the same problem. 5. No its not a licence problem, again at night we has kicked ALL connection off the server, then began logging in connections - by connection 8 we were seeing this problem. Well short of the licence count we have. 6. The network to the treatment machines are effectively on an isolated network back to the server, the rest are over the Hospital network. 7. Suggestions from the lantis people were to enable the IPX connections. This we have done, and we tried to make it ONLY IPX/SPX connections... But, Lantis loads and runs ok, but on the NT treatment machines a DOS program that is executed to run the interface to the Varian Clinacs would not work. We changed the batchfile that starts this (seqafs.bat) to replace the btrieve requester to the SPX version (breqtcp.exe to brequest.exe), but it still does not work, saying that the btrieve manager is inactive. We were unable to find a solution to this and rolled back to a TCP connection. Suggestion solutions via the linac list server, have included to ensure the IPX frame is not set to Auto detect as 802.3 & 802.2 combination could cause problems. Instead set it to 802.2 {John Byrne [jpb@rmpdrtp.demon.co.uk] A Suggestion - which I will have to check up on.} And from Langenegger, Armin [alang@allsaintshealthcare.org],..We have IMPAC and were getting a lot of error 90's running version 4.0. We upgraded the software to 4.3 and impac had a workstation setup module that you run from the server which configures your workstation to run IMPAC correctly. Changes were made to the NT registry and the environment variables to have the correct path (in the correct order) etc. This cleared up most of the error 90's. Then we upgraded to 5.0 and have not had any error 90's at all. Part of the issue if I remember correctly, included permissions to the config file. Thanks for the help, Keith Croft, Palmerston North, New Zealand. -----Original Message----- From: andrer@health.nb.ca [mailto:andrer@health.nb.ca] Sent: Wednesday, February 21, 2001 6:11 AM To: Keith Croft Subject: Re: Lantis Hi Keith, If you give me more info, I might be able to help you. {Snipped most of Andre's reply.... Keith.} Regards, Andre Robichaud Moncton NB Canada Tuesday Feb 20 13h10 ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens KD2 Message-ID: <001501c09b69$9fc47e60$4ab31ec4@willpazdahome> From: Will Pazda To: BMic644@aol.com, linac-eng@plato1.aristotle.net Subject: Re: Siemens KD2 Date: Tue, 20 Feb 2001 10:19:11 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Barry, I have had the exact same problem on an MX-2. I can't remember exactly what jaw it is, but it is an 'A' jaw. It is also noticed only on powerup in the morning (when they are setting up for a 10 X10 calibration field, also programmed the night before), no problems occur during a working day. It is also on a machine that although has assym capability, it is not enabled in the config proms, so an offset field confuses the hell out of the radiographers. The solution each time has been to switch off and on again (amazing how often this helps with problems !!!). I would estimate that this problem has occurred about 20 times in a 3 year span. I would be very interested in the responses you get. Regards, Will Pazda ----- Original Message ----- From: To: Sent: 20 February 2001 5:20 PM Subject: Siemens KD2 > Have an interesting problem with Jaw readouts. When the machine is powered > up in the morning, we have an A2 jaw fault with the jaw light field showing > 12 cm from collimator center and the readout claims it is at 5 cm. At this > point you can calibrate the A jaws and it is OK for the rest of the treatment > day. Also, you can just power down the machine and bring it back up and move > the jaws to a 10x10 field and everything is OK without calibrating the jaw > readout. At the end of the treatment day, the night crew leaves the jaw > settings for a 10x10 field but jaw A2 moves to the 12 cm setting during the > initial power up sequence. > > We have changed the jaw A pots. Calibration has been done several times. It > will be interesting to see the responses for this problem. Thank you in > advance for all the help on this one. > > Barry Michael > Saint Barnabas Health Care System > Livingston, NJ > 908-238-1231 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens KD2 Message-ID: <61.b927de6.27c3e520@aol.com> From: BMic644@aol.com To: linac-eng@plato1.aristotle.net Subject: Siemens KD2 Date: Tue, 20 Feb 2001 07:20:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Have an interesting problem with Jaw readouts. When the machine is powered up in the morning, we have an A2 jaw fault with the jaw light field showing 12 cm from collimator center and the readout claims it is at 5 cm. At this point you can calibrate the A jaws and it is OK for the rest of the treatment day. Also, you can just power down the machine and bring it back up and move the jaws to a 10x10 field and everything is OK without calibrating the jaw readout. At the end of the treatment day, the night crew leaves the jaw settings for a 10x10 field but jaw A2 moves to the 12 cm setting during the initial power up sequence. We have changed the jaw A pots. Calibration has been done several times. It will be interesting to see the responses for this problem. Thank you in advance for all the help on this one. Barry Michael Saint Barnabas Health Care System Livingston, NJ 908-238-1231 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: subscribing Message-ID: <200102201344.IAA13071@mailhub.hitchcock.org> From: Bob Herfurth To: linac-eng@plato1.aristotle.net Subject: subscribing Date: Tue, 20 Feb 2001 00:44:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" How can I subscrive to this interesting info group. We have a Varian CL-2100C Bob H. Robert D. Herfurth, Jr. (413) 582-2315 Cooley Senior BMET FAX 582-2959 Dickinson Biomedical Engineering Hospital 30 Locust Street P.O. Box 5001 Northamption, MA 01061-5001 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Rf rotary joint removal Message-ID: From: "Moore, Lee" To: "'Linac-Eng@plato1.aristotle.net'" Subject: Rf rotary joint removal Date: Mon, 19 Feb 2001 12:16:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi all. 2300c/d,serial#123 I am faced with replacing the RF rotary joint due to a massive leak found this morning. I have ordered the part for tomorrow delivery and was wondering if any on the list has encountered what seems to be a miserable repair due to space constraints. Any suggestions, tricks on how to best obtain access to the rotary joint would be greatly appreciated. I was wondering if there may be an advantage to disconnecting at different points beyond the in/out sections of the rotary joint(due to being hard to get to) and removing the rotary joint and output wave guide all as one piece and then gain access to repair. Thanks for any help. Lee Moore ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Lantis Message-ID: <00BE56E17E26D11197CB00805FA6803A04FAC2E4@pn_nt1.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Lantis Date: Mon, 19 Feb 2001 11:24:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I know this is NOT a linac question.... but, someone may have the answer. Is there a Lantis User list server? If not, has anyone using Lantis had error 90 reported, which then says it cannot open config file. This error appears to occur only when starting the Lantis application, and seems random - in that the machine giving this error - if left for a period of time - will later work OK. If anyone has had this problem, and solved it we would love to hear from you. Suggestions from Lantis themselves has included forcing the Btrieve to use SPX/IPX rather than the IP network protocol. This works just fine... except the connections to the Varian Linacs are made via a DOS application - this appears to use an IP connection to the Btrieve server. Altering the batchfile file that starts this (seqafs.bat) to replace the btrieve requester to the SPX version (breqtcp.exe to brequest.exe), but it still does not work, saying that the btrieve manager is inactive. Hence we restored the Btrieve Server to run on a mixed protocol of SPX/IPX and IP. Keith Croft Palmerston North New Zealand. ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Statistics!! Message-ID: From: David Price To: linac-eng@plato1.aristotle.net Subject: Re: Statistics!! Date: Fri, 16 Feb 2001 18:32:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I can tell you that at the University of Fla we have 3 engineers. We service 10 linacs,1 T1000, 5 sims, a RT250, HDR and at one time the CTsim and a chest unit. There is just one during normal treatment hours and 2 at night/afternoon to do investgative TS, PM/QA's. The early shift does warmup/calibration checks, TS, application problems and what ever else is needed to facilitate pateint treatment flow This includes MLC,s Stereotactic, IMRT,and all sorts of other stuff. At times we are hard pressed to keep up, especialy if we run into intermentate problems which can tale loads of time and expenses to Isolate David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net >From: tcullen@wfubmc.edu (Tim Cullen) >To: Jose Villegas >CC: linac-eng@plato1.aristotle.net >Subject: Re: Statistics!! >Date: Mon, 12 Feb 2001 08:23:21 -0500 > >Jose, I think if we were formally polled it would be around three to >four. The catch is the condition, age, bells/whistles, and previous >caretaker. (All of which, is often overlooked) >Tim > > >Jose Villegas wrote: > > > Is there any statistics? or what do you think it should be the Maximum > > number of Linacs that an in-house or field Engineer be responsible for > > in order to service them effectively? [Image] Thanks. Jose. > > > > > > ----------------------------------------------------------------------- > > Get your FREE download of MSN Explorer at http://explorer.msn.com _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Radiation Level outside Linac Bunker. Message-ID: <02f401c09878$8faf4620$1183a5d5@chris> From: Christine Usher To: linac-eng@plato1.aristotle.net Subject: Re: Radiation Level outside Linac Bunker. Date: Fri, 16 Feb 2001 16:12:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" When people are asking radiation protection questions it would be helpful to say where they are, as the answer usually depends on national law. The countries of the European Union have laws all based on the same standards so should be broadly compatible, but are not always so in the detail. However I gather the situation in the USA is considerably more diverse (and to a European eye pretty scary - to be blunt) In the UK the time average (8hr day 5 day week) dose rate outside a linac room would have to be less than 6mSV/yr, but we would aim for 1mSv The absolute instantaneous doserate is of little consequence. If you measure over short enough time (of order of 1 beam pulse it is hug. chris ----- Original Message ----- From: "Vroome, H. de (ONCO)" To: "Saoud Remy" ; Sent: Friday, February 16, 2001 9:23 AM Subject: RE: Radiation Level outside Linac Bunker. > In the Dutch regulation is the dose 2mSv/year for everyone in the building. > So when the door is in a working area it is 2mS/52/40 = 1 microSv/h, When it > is a corridore then it is 4 microSv/h.But you have to calculate the average > over the whole working day and for all radiation sources that influence the > same point. The momentaneous doserate is not of interest. > > > > ir. Henk de Vroome > Dept Clinical Oncology K1-P > Leiden University Medical Centre > PoBox 9600, 2300 RC Leiden, The Netherlands > tel #31 71 526 2914, fax #31 71 526 6760 > e-mail H.de_Vroome@lumc.nl > > > > -----Original Message----- > From: owner-linac-eng@plato1.aristotle.net > [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Saoud Remy > Sent: Friday, February 16, 2001 10:04 AM > To: linac-eng@plato1.aristotle.net > Subject: Radiation Level outside Linac Bunker. > > > Hi, > > Could you tell me what are the regulation concerning radiation leak outside > the bunker of a Linear Accelerator at 18 MV with 600 MU/MM at 2 meter from > the bunker door, with collimator fully open. > > Thanks for relating your experience, finding and reference to various world > regulations. > > Thanks and Regards. > > Saoude Remy > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Dynamic MLC Message-ID: <000c01c09864$45c58ce0$03000004@oemcomputer> From: Jill and Tom Ausfeld To: linac-eng@plato1.aristotle.net Subject: Dynamic MLC Date: Fri, 16 Feb 2001 14:03:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, I'm looking for some information on dynamic MLC. We have one that = frequently gives MLC faults during dynamic treatments. The clinician = hits clear and can continue. They have no prblems running it in static = mode. The ribbon cables and the slower motors were replaced. Is there = any way to see (by way of log file or something) what is causing the = faults?? Any info will be helpful Thanks Tom ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: TAXI chips for Varian MLC Message-ID: <3.0.6.32.20010216073444.007994d0@harringtoncc.org> From: rsmith@harringtoncc.org To: linac-eng@plato1.aristotle.net Subject: TAXI chips for Varian MLC Date: Fri, 16 Feb 2001 05:34:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good Morning; I think this has been on here before, but either I lost it or didn't print it out. Does anyone know where I can get the TAXI chips for the Varian MLC other than from Varian? I tried Newark, and they said the manufacturer (AMD) has stopped making them and does not list a replacement. Any help would be appreciated. Rick Smith Harrington Cancer Center Amarillo TX ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: FW: Siemens MLC Message-ID: From: "Barnes, Bill" To: "'Linac-Eng (E-mail)'" Subject: FW: Siemens MLC Date: Fri, 16 Feb 2001 02:19:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 FOR THOSE WHO MISSED IT BEFORE: Just finished doing speed calibrations with Kathy Gardener from Siemens two weeks ago. The way that seemed to work out the best was to reset all leafs to default so we had had starting point. Next we adjusted the leaves for fast speed. Every leaf's Hex code was written into a excel spread sheet for future reference. We adjusted so all leaf speeds were getting to their slow down point within about 1 sec of each other. Next we adjusted the slow speeds trying to keep all leafs getting to their final destination as fast as possible without having overshoot. Make sure you document hex codes on spreadsheet. after adjustments turn gantry to 90 deg. Check both fast and slow leaf speeds with and against gravity. You may possibly need to touch up some of the speeds. Turn Gantry to 270 deg and check leaf speeds with and against Gravity. Some leaves may need to be adjusted to the point of having some overshoot, I would try to keep this to a minimum If you document your hex codes it help you determine if there is a problem with a leaf by how often you are having to adjust the same leaf. If you have any other questions I would be happy to help you any way I can. I would keep the spread sheets taped to the MLC cabinet for future reference. Dave Liounis Fox Chase Cancer Center Radiation Oncology Engineering 215-728-2997 D_LIOUNIS@FCCC.EDU ====================================================================== ===================================== > when calibrating the positional part of the Siemens MLC, it worked > better for us to begin calibration with both MLC banks at +20cm. > Power Off the MLC cabinet. Release the software interlocks at the > MLC cabinet, restore power to cabinet, then drive one bank of the > MLC beyond the -10cm point and into the mechanical stops. Do the > Encoder initialization at this point, instead of at -10cm. This > seems to give us a better overall calibration. Then proceed with > the rest of your MLC calibration by moving the bank to > -10cm and start the capture process. Then do the same for the > other bank. > > Also when doing the capture process, always try to capture the data > from a leaf when the leaf has been driven from one direction > consistently... by this I mean move the leaf from the -10 cm point > to the 0cm point and if you overshoot the capture point, then take > the leaf back to the negative side and move it to where you want it > to be. This seemed to help us compensate for the mechanical > backlash. > > I hope this will help someone else as it has helped us... > > v/r > > Billy Barnes B.S.E.T. > Radiation Oncology Engineer > > Fox Chase Cancer Center > 7701 Burholme Ave. > Philadelphia, Pa. 19111 > > 215-728-2997 > 215-728-4789 fax > > B_barnes@fccc.edu > > -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOo0AhqaK70jdHRmKEQKsuQCg7KmSP6nhnp8h7njmhCPizh186KgAn0Rj vpmosCW63Gzoo2Z83MOicuem =6oR7 -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Radiation Level outside Linac Bunker. Message-ID: From: "Vroome, H. de (ONCO)" To: Saoud Remy , linac-eng@plato1.aristotle.net Subject: RE: Radiation Level outside Linac Bunker. Date: Fri, 16 Feb 2001 01:23:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In the Dutch regulation is the dose 2mSv/year for everyone in the building. So when the door is in a working area it is 2mS/52/40 = 1 microSv/h, When it is a corridore then it is 4 microSv/h.But you have to calculate the average over the whole working day and for all radiation sources that influence the same point. The momentaneous doserate is not of interest. ir. Henk de Vroome Dept Clinical Oncology K1-P Leiden University Medical Centre PoBox 9600, 2300 RC Leiden, The Netherlands tel #31 71 526 2914, fax #31 71 526 6760 e-mail H.de_Vroome@lumc.nl -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Saoud Remy Sent: Friday, February 16, 2001 10:04 AM To: linac-eng@plato1.aristotle.net Subject: Radiation Level outside Linac Bunker. Hi, Could you tell me what are the regulation concerning radiation leak outside the bunker of a Linear Accelerator at 18 MV with 600 MU/MM at 2 meter from the bunker door, with collimator fully open. Thanks for relating your experience, finding and reference to various world regulations. Thanks and Regards. Saoude Remy ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Radiation Level outside Linac Bunker. Message-ID: <065801c097f7$bd034bc0$c883fea9@patpentium3> From: Saoud Remy To: linac-eng@plato1.aristotle.net Subject: Radiation Level outside Linac Bunker. Date: Fri, 16 Feb 2001 01:04:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, Could you tell me what are the regulation concerning radiation leak outside the bunker of a Linear Accelerator at 18 MV with 600 MU/MM at 2 meter from the bunker door, with collimator fully open. Thanks for relating your experience, finding and reference to various world regulations. Thanks and Regards. Saoude Remy ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Job add attempt #2 Message-ID: <83C77028057AD311B19C0008C745F8656D8263@sydserver.medapps.com.au> From: Leo Schmidt To: "'Linac Bulletin Board Posting' (E-mail)" Subject: Job add attempt #2 Date: Wed, 14 Feb 2001 19:00:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" National Support Engineer Radiation Therapy Equipment We are seeking an exceptional Support Engineer with experience in service and installation of Siemens Linear Accelerators for our Sydney based National Support Center. The position involves the provision of technical support within Australia, New Zealand and SE Asia. . We require a professional individual who has: * Commitment to excellence in customer satisfaction * Optimistic Outlook * Self motivation with a focus on results * Troubleshooting experience and analysis skills appropriate to medical engineering * Excellent communications skills * Ability to work both as a team member and self managed * Organisational skills and reliability * Understanding and the will to work around the needs of Hospital work loads This is an opportunity for you to be part of a World Class organisation supporting Health Care Professionals. An attractive remuneration package will be offered to the successful applicants. Enquiries to Mr P. Lake on (61)0(2) 9844 2700 Email applications to: j.kelly@medapps.com.au Written applications to: Joanne Kelly - Human Resources Advisor MEDICAL APPLICATIONS PTY LTD PO Box 219, GLADESVILLE NSW 1675 Australia Quote reference: Radiation Therapy Position Applications close: 2 March 2001 An Equal Opportunity Employer and Non-Smoking Environment Leo Schmidt National Support Specialist, Radiotherapy Service Engineer Medical Applications Pty Ltd 6 Hamra Drive Export Park Adelaide Airport 5950 South Australia Phone:+61 8 82344822 Fax:+61 8 82343618 Mobile +61 (0)411 236 632 mailto:l.schmidt@medapps.com.au **************************************************************** WARNING- This e-mail is intended for the addressee(s) only and may contain legally privileged or confidential information. If received in error, please notify sender by return e-mail. Any use, disclosure, copying or distribution of this message or it's contents is prohibited. **************************************************************** ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: SIEMENS MLC Message-ID: From: Dave Pinchin To: "Barnes, Bill" , linac-eng@plato1.aristotle.net Subject: Re: SIEMENS MLC Date: Wed, 14 Feb 2001 12:46:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, Nice to hear some encouraging news. Too often we only hear the 'They should' and the 'Why doesn't' and end up feeling that we are out here and nobody cares.......... Thanks Dave. ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: SIEMENS MLC Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Cc: "Hotz Stephen (E-mail)" , "Longo Richard (E-mail)" Subject: SIEMENS MLC Date: Wed, 14 Feb 2001 11:00:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Everyone, I would like to take a moment to say "Thank You" to Mrs. Teresa Smith, a Siemens Factory MLC Engineer, for going beyond the call of duty, to help us. We had been having some minor but antagonistic problems with a MLC unit on one of our 4 Primus systems. Despite being in Pain and still recovering from a surgery, Teresa flew out and spent almost a week with us to help resolve the problems and fine tune the other MLC units. It has been over two weeks now that we have not had a single problem with the MLC's (knock on wood to not jinx myself). I know from personal experience, that too often we put forth an extra effort to fix something and it will go un-noticed by everyone else. That is why I wanted to post this to the list I posted some of what we learned during her visit to Fox Chase, if you have questions about the new way to calibrate the MLC, please let me know and I will repost the information. Sincerely, Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOorXw6aK70jdHRmKEQKyJACg2AwIgo8sJHkwy6ZWI0nU+e9d/R8AnjTe R4QRtUi/0OVlJnkO1zv2R82s =mR8L -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian Message-ID: <3A87F50B.CB5685E9@yale.edu> From: "Peter E. Vitali" To: yorkej@cbhc.ns.ca Cc: LinacEng Subject: Re: Varian Date: Mon, 12 Feb 2001 06:37:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jeremy: The graticule uses the Port Film Reserve Code and I it can only be used during port film. If you leave it in during treatment it will give an accessory fault. Pete Vitali ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian Message-ID: From: Jeremy Yorke Reply-To: yorkej@cbhc.ns.ca To: LinacEng Subject: Varian Date: Mon, 12 Feb 2001 05:34:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good morning, Anyone use the upper port film graticule on the 2100/600 machines. We have one here but it seems that the software is not coded for this accessory. The collimator light stays red when inserted and the code that is read back by the optical code reader matches no codes. Thanks Jeremy Yorke C.E.T Cape Breton Cancer Center 1482 George Street Sydney, Nova Scotia B1P 1P3 Canada (902)567-8000, ext.2163 yorkej@cbhc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Statistics!! Message-ID: <3A87E3C9.5B506FE6@wfubmc.edu> From: tcullen@wfubmc.edu To: Jose Villegas Cc: linac-eng@plato1.aristotle.net Subject: Re: Statistics!! Date: Mon, 12 Feb 2001 05:23:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Jose, I think if we were formally polled it would be around three to four. The catch is the condition, age, bells/whistles, and previous caretaker. (All of which, is often overlooked) Tim Jose Villegas wrote: > Is there any statistics? or what do you think it should be the Maximum > number of Linacs that an in-house or field Engineer be responsible for > in order to service them effectively? [Image] Thanks. Jose. > > > ----------------------------------------------------------------------- > Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_002_01C19968.260B5550 Content-Type: message/rfc822 To: Subject: Date: Mon, 12 Feb 2001 13:10:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_004_01C19968.260B5550" ------_=_NextPart_004_01C19968.260B5550 Content-Type: text/plain Jose, I think if we were formally polled it would be around three to four. The catch is the condition, age, bells/whistles, and previous caretaker. (All of which, is often overlooked) Tim Jose Villegas wrote: Is there any statistics? or what do you think it should be the Maximum number of Linacs that an in-house or field Engineer be responsible for in order to service them effectively? Thanks. Jose. _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_004_01C19968.260B5550 Content-Type: image/gif; name="C:\\TEMP\\nsmail2U.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="C:\\TEMP\\nsmail2U.gif" Content-ID: Content-Location: ATT-0-4DA9F43EA200D5119DBB00508B939D06-C TEMPnsm.gif R0lGODlhEAAQALP/AI93/1tbhnZ2o5eXx7S04szM/7i43OPj/vLXqHBFAJ17QcmrePCseMDAwC0t LQAAACH5BAEAAA0ALAAAAAAQABAAQARfsMk5hx00paWULkUgFAdGTWM4lo3mIDDsNKNwnilBkOad BgFei5OAMRwJEOhga70Y0JnAcKumhFUaSIT1bVe9lkZb0Ak3xAQyKRic1QwYwMFUNsUvxFEiuE9e DoFZDREAOw== ------_=_NextPart_004_01C19968.260B5550-- ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Statistics!! Message-ID: From: David Burgess To: villegaj@hotmail.com, linac-eng@plato1.aristotle.net Subject: Re: Statistics!! Date: Mon, 12 Feb 2001 04:02:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Jose, There is a guideline (Canadian I think). I'll try to find it again and send it to you. However, remember that it depends if you have PV, MLC, IMRT, Steriotactic, Varis or RV... We recently made a comparision of several clinics of which ours was small. But when we added all the options our machines have it turned out that Carl and I have one of the largest service loads in Canadian clinics. It didn't inspire our clinic to give us one of the highest salaries though, but our salaries did come up to average. Best regards David Burgess >>> "Jose Villegas" 2/11/2001 11:07:34 PM >>> ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Vacancy Message-ID: <83C77028057AD311B19C0008C745F8656D825D@sydserver.medapps.com.au> From: Leo Schmidt To: "'Linac Bulletin Board Posting' (E-mail)" Subject: Vacancy Date: Sun, 11 Feb 2001 21:47:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" My manager has asked me to post the following Job Vacancy Leo Schmidt National Support Specialist, Radiotherapy Service Engineer Medical Applications Pty Ltd 6 Hamra Drive Export Park Adelaide Airport 5950 South Australia Phone:+61 8 82344822 Fax:+61 8 82343618 Mobile +61 (0)411 236 632 mailto:l.schmidt@medapps.com.au **************************************************************** WARNING- This e-mail is intended for the addressee(s) only and may contain legally privileged or confidential information. If received in error, please notify sender by return e-mail. Any use, disclosure, copying or distribution of this message or it's contents is prohibited. **************************************************************** ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Statistics!! Message-ID: From: Jose Villegas To: linac-eng@plato1.aristotle.net Subject: Statistics!! Date: Sun, 11 Feb 2001 19:07:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Is there any statistics? or what do you think it should be the Maximum number of Linacs that an in-house or field Engineer be responsible for in order to service them effectively? Thanks. Jose. _____ Get your FREE download of MSN Explorer at http://explorer.msn.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron CX install planning Message-ID: From: PilotDaveR@cs.com To: TLRoliff@covhealth.org, linac-eng@plato1.aristotle.net Subject: Re: Ximatron CX install planning Date: Fri, 9 Feb 2001 09:12:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Varian's Planning Department will be glad to send you a copy of the planning guide. It is called Installation Planning Guide (IDP) it also includes an AutoCAD software diskette with the same information and templates to assist an architect. Call your local Varian Office. Varian's Stock Number is VAR-003 Good Luck David Rodriguez email PilotDaveR@cs.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Ximatron CX install planning Message-ID: <3A841B11.AE690431@wfubmc.edu> From: tcullen@wfubmc.edu To: "Timothy L. Roliff" Cc: "'linac-eng@plato1.aristotle.net'" Subject: Re: Ximatron CX install planning Date: Fri, 9 Feb 2001 08:30:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Tim, I've had good luck just calling Varian and requesting this type of info from their installation group. Usually arriving overnight. "Timothy L. Roliff" wrote: > Does anyone have any of the installation planning documentation for the > Ximatron CX simulator that they would be willing to share a copy of? > > Tim Roliff, CRES > tlroliff@covhealth.org > Covenant Healthcare, Milwaukee, Wisconsin > Clinical Engineering > (414)874-4159 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Quality Assurance Jigs. Message-ID: <3A841CBF.E4BA9166@wfubmc.edu> From: tcullen@wfubmc.edu To: Ward Dixon Cc: linac-eng@plato1.aristotle.net Subject: Re: Quality Assurance Jigs. Date: Fri, 9 Feb 2001 08:37:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ward, just a thought, if you know what you would like to have and know of a machine shop with the latest machining equipment it can be just as easy to have what you want made up to your specs. Ward Dixon wrote: > Would someone be kind enough to let me know if there are sources for daily quality assurance jigs, other than Med Tec and Canadian Scientific. I would like to find units that are independent of the machine but would be open to units that attach to the collimators. We have a Varian 2100 C/D and a Siemens MXE-2. > Thank you, Ward Dixon ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Ximatron CX install planning Message-ID: <149FFFD49CF5D411815800508B6695602671EC@sjh_exchange08.covhealth.org> From: "Timothy L. Roliff" To: "'linac-eng@plato1.aristotle.net'" Subject: Ximatron CX install planning Date: Fri, 9 Feb 2001 08:15:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone have any of the installation planning documentation for the Ximatron CX simulator that they would be willing to share a copy of? Tim Roliff, CRES tlroliff@covhealth.org Covenant Healthcare, Milwaukee, Wisconsin Clinical Engineering (414)874-4159 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Quality Assurance Jigs. Message-ID: From: Ward Dixon To: linac-eng@plato1.aristotle.net Subject: Quality Assurance Jigs. Date: Fri, 9 Feb 2001 07:44:49 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Would someone be kind enough to let me know if there are sources for daily quality assurance jigs, other than Med Tec and Canadian Scientific. I would like to find units that are independent of the machine but would be open to units that attach to the collimators. We have a Varian 2100 C/D and a Siemens MXE-2. Thank you, Ward Dixon ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 6/100 SF-6 Leak Message-ID: <6CE096D0CDF4D211A3110008C75D07523605BA@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: 6/100 SF-6 Leak Date: Fri, 9 Feb 2001 07:15:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, To everyone who responded to my inquiry about our SF-6 leak I wanted to say thank you. Overwhelming response to say the least. All good information though. I did know to mark the position of the probe prior to removing it and I appreciate all the responses reminding me to do that. The leak is very minor at this time so I will probably look at it next week. I just wanted to be prepared for the worst prior to starting. Thanks Again and have a great weekend, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Any magnetron arcing Message-ID: <000401c0925a$47bf3880$c39aacd1@pen300> From: Dave D To: Linac-Eng Subject: Any magnetron arcing Date: Thu, 8 Feb 2001 21:21:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This another possibility: Any magnetron regardless of the manufacturer, or the associated servo systems will arc. Some causes might be; an impedence mismatch (in the RF system), insufficient heating (may be intermittent), or just plain gas. Outgassing of a magnetron often solves the "gassy" problem. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian C series V5.4 Message-ID: <002101c0924a$4ed6a960$32a199d1@thunderbird> From: Jeff Cressman To: Dave Pinchin , linac-eng@plato1.aristotle.net Subject: Re: Varian C series V5.4 Date: Thu, 8 Feb 2001 19:42:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" One common cause of this problem has been the secondary contact ( a piggybacked microswitch ) on the K2 Relay in the modulator. If there is a problem in the newer C3 machines this is supposed to latch a HWFA I/L and in the older C-Series it's a CTRL I/L. The piggybacked microswitch is part of the BEAMON Enable line and its condition is checked twice within the first few milliseconds after the BEAM ON button is pressed. The microswitch is 1st checked to verify K2 ( Step Start Relay ) pulled in and checked a 2nd time to verify it has released. My opinion is that if this piggybacked microswitch gets "flaky" it causes the I/L, but may not always latch it. I heard a rumor that this microswitch may be left off K2 in the newest generation of modulator. If this rumor becomes fact, maybe it will lead to a STB allowing the removal of the microswich on older modulators. I wish to state that the above information, while based partially on observation, is only my opinion and is presented for entertainment purposes only ; -) Jeff Cressman ----- Original Message ----- From: "Dave Pinchin" To: Sent: Thursday, February 08, 2001 4:47 PM Subject: Varian C series V5.4 > G'day list, > We have a puzzling question.......... > Occasionally an interlock happens within the first few milliseconds of beam on. I am suspicious that this event does not actually generate a log file. > Does anybody have suspicions of this or any definite information?????? > > I think I have seen this with a BMAG on a C1a 2100 and with a MOD on a 600c. > > TIA > Dave :) > > > > > ** This email and attachments have been scanned for content and viruses > and is believed to be clean ** > > This email or attachments may contain confidential or legally > privileged information intended for the sole use of the addressee(s). > Any use, redistribution, disclosure, or reproduction of this message, > except as intended, is prohibited. If you received this email in error, > please notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed in this > email (unless otherwise stated) may not represent those of Canterbury > District Health Board. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian C series V5.4 Message-ID: From: Dave Pinchin To: linac-eng@plato1.aristotle.net Subject: Varian C series V5.4 Date: Thu, 8 Feb 2001 13:47:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day list, We have a puzzling question.......... Occasionally an interlock happens within the first few milliseconds of beam on. I am suspicious that this event does not actually generate a log file. Does anybody have suspicions of this or any definite information?????? I think I have seen this with a BMAG on a C1a 2100 and with a MOD on a 600c. TIA Dave :) ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Re magnetron (MG5349) arcing Message-ID: <862569ED.006418FA.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: kimyeung@netvigator.com Cc: Linac-Eng@plato1.aristotle.net Subject: Re: Re magnetron (MG5349) arcing Date: Thu, 8 Feb 2001 10:02:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The other responses given so far seem more likley, but here is one lesser possibility...This is a bit of a reach, but try turning off the YIELD servo when this happens. If your ion chamber is leaking and hits a temperature extreme, it is one of the inputs to the yield servo (the other is target current). The change in chamber response due to temperature could possibly be driving the servo to turn up the magnetron current to the point where it arcs. You will also be able to observe a rather large (3%) change in cGy per MU at this time as well. Tim Waldron "kimyeung@ultraline" cc: (bcc: Timothy J. Waldron/MDACC) Subject: Re magnetron (MG5349) arcing Hi Colleagues, We always found MOD interlocks with the magnetron, MG5349, when the room temperature is less than 17 deg C. Can anyone give advice / suggestion on this issue? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: template Message-ID: <3A82EA5A.75C2D1D3@scf.sk.ca> From: Scot Thiesson To: Linac Eng Subject: template Date: Thu, 8 Feb 2001 10:50:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Subject: Manufacturer: Model: Type: S/N: Software Version: Problem Description: Problem Solution: ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Upgrade to Varis Gen 6 Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: "Peter E. Vitali" Cc: kevinpueschel@worldnet.att.net, "Linac-Engineers, Listserver" Subject: Re: Upgrade to Varis Gen 6 Date: Thu, 8 Feb 2001 07:34:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Peter; The hardwired MLC interlock is a gun pulse delay that is part of the Dynamic Multileaf Collimator capability and not just an exclusively Millenium MLC feature... Len On Thu, 08 Feb 2001 09:31:19 -0500 "Peter E. Vitali" wrote: > Kevin: I really can't say since I went from version 4.0 to version 6.1. There were a lot of changes in this version to me. And you still get the > breaking with a free floating couch. > > The biggest change is with the Millennium MLC. The new version of the Millennium MLC has an MLC interlock that cannot be bypassed easily. There is a > hard wire interlock which cannot be overwritten in Service Mode alone. You have to go to Physics Mode first and deactivate the MLC before you can > over write it in Service Mode. This means that if a physicist wants to calibrate the machine with out turning on the MLC he/she cannot do it. You > will not be able to beam on because of the MLC interlock. Or if you want to service the machine without MLC being activated, it is in parked > position and you want to do a check something in a clinical mode, you can't do it without turning on the MLC and waiting for it to initialized, etc. > Makes it harder to do the simple things. > > kevinpueschel@worldnet.att.net wrote: > > > Anything odd or different on ver 6? Did they add any more > software > interlocks? Did they remove the brake action at > the end of travel when in in > free float on the couch? > > Kevin Pueschel > ----- Original Message ----- > > From: "Peter E. Vitali" > To: > "Carl Murphy" > Cc: > > Sent: Wednesday, > February 07, 2001 4:32 PM > Subject: Re: Upgrade to Varis > Gen 6 > > > > Carl: Clinac Version 6 is out. We have it on both > our 2100Cs. We are > using Varis 1.4 so I can't say what > you need for Varis 6 > > > > > Pete Vitali > > > > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Re magnetron (MG5349) arcing Message-ID: <01Feb8.151101gmt.118084@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: Linac-Eng@plato1.aristotle.net Subject: Re: Re magnetron (MG5349) arcing Date: Thu, 8 Feb 2001 07:11:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I suppose after a comment like my last one I'd better add some value to the list: Kim, Is this a Varian 6/100/600C we're talking about? If so, are you keeping the m/c in St.By overnight? This should maintain it at a contant temp.and room temp should have little or no effect on running. If you switch the machine completely off and let the m/c cool down to room temp, they can sometimes complain. I assume this is the case because the guide resonates at a different freq when cold and the load characteristics to the maggie will change. From experience, old time-served maggies don't like this sometimes and will spark to prove it! Also make your AFC doing it's job properly by checking the rabbit's ears and also that the error quickly goes to zero when beaming on. Check that the AFC Zero error coincides with best ears. Someone else made the comment regarding the gas pressure but give it a purge as well. Make sure you check the basics - AFC, DQing level, Mag I etc before blaming the maggie. then if you have a spare, try swapping it but remember this can sometimes cover up the real problem as a new maggie is sometimes more tolerant of poor RF conditions. Chris >>> "kimyeung@ultraline" 02/08 2:03 pm >>> Hi Colleagues, We always found MOD interlocks with the magnetron, MG5349, when the room temperature is less than 17 deg C. Can anyone give advice / suggestion on this issue? Thanks in advance. Kim Yeung Chris Forrest Technical Specialist Medical Physics Service Cookridge Hospital Leeds, UK LS16 6QB Tel +44 113 392 4354 Fax +44 113 392 4122 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Upgrade to Varis Gen 6 Message-ID: <3A82ADA4.3E85B389@yale.edu> From: "Peter E. Vitali" To: kevinpueschel@worldnet.att.net, "Linac-Engineers, Listserver" Subject: Re: Upgrade to Varis Gen 6 Date: Thu, 8 Feb 2001 06:31:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kevin: I really can't say since I went from version 4.0 to version 6.1. There were a lot of changes in this version to me. And you still get the breaking with a free floating couch. The biggest change is with the Millennium MLC. The new version of the Millennium MLC has an MLC interlock that cannot be bypassed easily. There is a hard wire interlock which cannot be overwritten in Service Mode alone. You have to go to Physics Mode first and deactivate the MLC before you can over write it in Service Mode. This means that if a physicist wants to calibrate the machine with out turning on the MLC he/she cannot do it. You will not be able to beam on because of the MLC interlock. Or if you want to service the machine without MLC being activated, it is in parked position and you want to do a check something in a clinical mode, you can't do it without turning on the MLC and waiting for it to initialized, etc. Makes it harder to do the simple things. kevinpueschel@worldnet.att.net wrote: > Anything odd or different on ver 6? Did they add any more software > interlocks? Did they remove the brake action at the end of travel when in in > free float on the couch? > Kevin Pueschel > ----- Original Message ----- > From: "Peter E. Vitali" > To: "Carl Murphy" > Cc: > Sent: Wednesday, February 07, 2001 4:32 PM > Subject: Re: Upgrade to Varis Gen 6 > > > Carl: Clinac Version 6 is out. We have it on both our 2100Cs. We are > using Varis 1.4 so I can't say what you need for Varis 6 > > > > Pete Vitali > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Re magnetron (MG5349) arcing Message-ID: <01Feb8.143055gmt.118084@minotaur.ulth.northy.nhs.uk> From: Chris FORREST To: linac-eng@plato1.aristotle.net Subject: Re: Re magnetron (MG5349) arcing Date: Thu, 8 Feb 2001 06:30:53 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Set the room thermostat to 18C............. sorry, couldn't resist! Chris Forrest Technical Specialist Medical Physics Service Cookridge Hospital Leeds, UK LS16 6QB Tel +44 113 392 4354 Fax +44 113 392 4122 >>> "kimyeung@ultraline" 02/08 2:03 pm >>> Hi Colleagues, We always found MOD interlocks with the magnetron, MG5349, when the room temperature is less than 17 deg C. Can anyone give advice / suggestion on this issue? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Large bore CT Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Large bore CT Date: Thu, 8 Feb 2001 06:11:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks! Representatives from Marconi Medical (nee Picker) were here last week offering us a trade in on our PQ2000S for a large bore (85 cm) Oncology CT Simulator. Does anyone have these and how are they from a reliability/service point of view? Thanks in advance, Carl Murphy, C.E.T. Linear Accelerator Service Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Re magnetron (MG5349) arcing Message-ID: <3A82AA23.7AE77AFF@yale.edu> From: "Peter E. Vitali" To: "kimyeung@ultraline" Cc: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: Re magnetron (MG5349) arcing Date: Thu, 8 Feb 2001 06:16:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Kim: Check the Gas pressure. It may be way down due to leaks, or volume change due to the change in temperature. The other thing that it could be is the AFC cannot get to the frequency needed for the cold RF guide or the accelerator guide. Pete Vitali ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Machine Type Message-ID: <3A82A726.1572B51C@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" Subject: Machine Type Date: Thu, 8 Feb 2001 06:03:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" To all: Good morning! I wish that when ever some one uses this listserver to post a question about some problem they are having with a machine or software, the first thing that is stated is what make , model, version of machine or software you are having the problem with. Then describe the problem. Thanks Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re magnetron (MG5349) arcing Message-ID: <3A829F4B.804EF94E@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re magnetron (MG5349) arcing Date: Thu, 8 Feb 2001 05:29:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We always found MOD interlocks with the magnetron, MG5349, when the room temperature is less than 17 deg C. Can anyone give advice / suggestion on this issue? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Upgrade to Varis Gen 6 Message-ID: <3A81BE88.E5BBDC2C@yale.edu> From: "Peter E. Vitali" To: Carl Murphy Cc: linac-eng@plato1.aristotle.net Subject: Re: Upgrade to Varis Gen 6 Date: Wed, 7 Feb 2001 13:32:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Carl: Clinac Version 6 is out. We have it on both our 2100Cs. We are using Varis 1.4 so I can't say what you need for Varis 6 Pete Vitali ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: xray tube Message-ID: From: Jeremy Yorke Reply-To: yorkej@cbhc.ns.ca To: LinacEng Subject: xray tube Date: Wed, 7 Feb 2001 10:48:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a Xiamtron with a Rad60 tube, this morning I noticed a small oil patch on the floor beneath the head. I believe that the tube casing is leaking oil, depending on gantry angle. Anyone had any success sealing the area with some epoxy or sealant?? How about removing the tube from the casing and replacing the seals?? I am sure the first solution is far less of a headache.... thanks Jeremy Jeremy Yorke C.E.T Cape Breton Cancer Center 1482 George Street Sydney, Nova Scotia B1P 1P3 Canada (902)567-8000, ext.2163 yorkej@cbhc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Water Systems on Varian Linacs Message-ID: From: Randy Reply-To: randy@radparts.com To: linac-eng@plato1.aristotle.net Subject: RE: Water Systems on Varian Linacs Date: Wed, 7 Feb 2001 08:38:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Why is the culligan system being replaced. Has Varian admitted that it was detrimental to the system? (i.e. metal leeching) Randy, Dee, Jeff The Radparts Guys -----Original Message----- From: owner-linac-eng@plato1.aristotle.net [mailto:owner-linac-eng@plato1.aristotle.net]On Behalf Of Williams, Rod Sent: Tuesday, February 06, 2001 5:45 AM To: 'linac-eng@plato1.aristotle.net' Subject: Water Systems on Varian Linacs Well it looks like it is official, there is a STB out on removing the Culligan Deionizer on your Linacs, Varian is going to be selling a filter, and some Biocide. This new water setup is on back order so I don't know how long before we will be able to get it in our hands.You might want to check with your local rep, as you know STBs are TOP SECRET. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: console fan replacement Message-ID: From: Virago1100@aol.com To: sthiesson@scf.sk.ca, lisa@technicaloptions.com Cc: linac-eng@plato1.aristotle.net Subject: Re: console fan replacement Date: Wed, 7 Feb 2001 08:23:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The new style fans (ETRI brand) and new mounting plate are available from RadParts (1-877-704-3838). P/N's 37-3006-00 (Mtg plate) 37-3050-00 (ETRI fan, two required) Jim McKenzie ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Water Systems on Varian Linacs Message-ID: From: "Turner, Guy" To: "'linac-eng@plato1.aristotle.net'" Subject: RE: Water Systems on Varian Linacs Date: Wed, 7 Feb 2001 08:20:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It was only a matter of time. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Williams, Rod [SMTP:rod.williams@phci.org] > Sent: Tuesday, February 06, 2001 5:45 AM > To: 'linac-eng@plato1.aristotle.net' > Subject: Water Systems on Varian Linacs > > Well it looks like it is official, there is a STB out on removing the > Culligan Deionizer on your Linacs, Varian is going to be selling a filter, > and some Biocide. This new water setup is on back order so I don't know > how > long before we will be able to get it in our hands.You might want to check > with your local rep, as you know STBs are TOP SECRET. > > Rod.Williams@phci.org > WAUKESHA MEMORIAL HOSPITAL > 262-928-4734 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: console fan replacement Message-ID: <003e01c09118$ea4050a0$2d66aec7@techop.com> From: technical options To: Scot Thiesson , Linac Eng Subject: Re: console fan replacement Date: Wed, 7 Feb 2001 07:16:12 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Scot, The old fan, part number 20939800 is obsolete. The panel with the new fan is part number 89048503. There is a part number for the fan alone - 20939809 - but it will not fit in the older style mounting. Hope this info helps. Lisa Przepasniak Technical Options of Georgia ----- Original Message ----- From: Scot Thiesson To: Linac Eng Sent: Tuesday, February 06, 2001 1:40 PM Subject: console fan replacement > Does anyone know offhand the manufacturer and part number for the > console fans on the 2100 C3 Linacs? This is the unit as per drawing > 890475 item 14. The fan assembly is listed but not broken down. > > Scot Thiesson > A.B.C.C. > Regina SAsk. > Canada > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: console fan replacement Message-ID: <3A81687B.7C7A0548@scf.sk.ca> From: Scot Thiesson To: technical options Cc: Linac Eng Subject: Re: console fan replacement Date: Wed, 7 Feb 2001 07:23:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is making sense now. As I recently discovered, the old 'feather ' model fans are no longer made. Worse then that, the mounting holes on the old bracket don't seem to be compatible with any other offerings rom Comair Rotron. Could it be possible that my nearly new Varian Linac comes complete with obsolete parts? Scot Thiesson A.B.C.C. Regina Sask. Canada technical options wrote: > Scot, > > The old fan, part number 20939800 is obsolete. The panel with the new fan > is part number 89048503. There is a part number for the fan alone - > 20939809 - but it will not fit in the older style mounting. Hope this info > helps. > > Lisa Przepasniak > Technical Options of Georgia > ----- Original Message ----- > From: Scot Thiesson > To: Linac Eng > Sent: Tuesday, February 06, 2001 1:40 PM > Subject: console fan replacement > > > Does anyone know offhand the manufacturer and part number for the > > console fans on the 2100 C3 Linacs? This is the unit as per drawing > > 890475 item 14. The fan assembly is listed but not broken down. > > > > Scot Thiesson > > A.B.C.C. > > Regina SAsk. > > Canada > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Picker Zephyer Message-ID: From: Mlaa@aol.com To: linac-eng@plato1.aristotle.net Subject: Picker Zephyer Date: Tue, 6 Feb 2001 21:39:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all on the list. Does anybody out there have a working Picker Zephyer, GE Maximar or a Phillips RT 100 that they would like to get rid of. If anyone knows of such a rare animal, please contact me either by e-mail or at the number below. Thanks Mike Liddicote Accelerator Associates (909) 279-9853 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 6/100 SF-6 Leak Message-ID: From: KentR6727@aol.com To: linac-eng@plato1.aristotle.net Subject: Re: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 20:40:29 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In a message dated 2/6/01 2:59:46 PM Pacific Standard Time, CraigP@ahsl.co.nz writes: << I agree that one of the common leak areas is inside the N connector. It is important to mark the position very carefully both in angle and depth. >> I suspect many of the readers of this list will already know "how" to replace their power sample ports. If you do you can safely ignore this message. In my ten years as a Field Service Engineer, I found numerous leaky power sampling units. The original position of a power sample probe can be best determined by measureing the power at the port on an oscilloscope. Measure the power at an xray energy in open loop mode. Xray energies have higher power levels than at electron energies. Use the attenuators and a crystal (diode) to connect to the scope. Change attenuation as needed to get a signal that is readable, upto no more than a 1 volt signal (or the diode could be damaged). Install the NEW power sample unit at the approximate distance of the OLD unit. For reverse power port, tune off frequency to get a readable "square wave" signal. Adjust the initial position of the NEW sample port to as close as possible the removed unit. Install the new unit with the same attenuators and rerun the accelerator at the same energy. Adjust the new port to obtain a scope signal that is nearly the same as the old. I would also recommend using as a reference a forward power signal for both measurements. Remember to reinstall the original attenuators and correct coax cables ..... ;-) ..... (works much better!) The accelerator feedback control system depends on the RATIO of forward power to reverse power. This would be a good time to measure this ratio for future reference, usually measured at the highest xray energy. Kent ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Accelerator Solenoid Water Leak Message-ID: From: GARRYANGEL@aol.com To: linac-eng@plato1.aristotle.net Subject: Accelerator Solenoid Water Leak Date: Tue, 6 Feb 2001 15:01:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Everyone ... We have an accelerator solenoid on an 1800 that is leaking water. And we cannot physically get to the source of the leak. Has anyone successfully sealed a leak in the accelerator solenoid? If so what did you use. Seems that we should be able to "pump" in a sealer. Just don't know what to use! Any suggestions are welcome. Thanks in advance .. Garry ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: console fan replacement Message-ID: <149FFFD49CF5D411815800508B6695602671EA@sjh_exchange08.covhealth.org> From: "Timothy L. Roliff" To: 'Scot Thiesson' , Linac Eng Subject: RE: console fan replacement Date: Tue, 6 Feb 2001 14:38:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Are you talking about the large muffin fan on the back of the electronics cabinet? We get ours from Newark Electronics, stock #66F3402. It is manufactured by Comair/Rotron according to my notes. I haven't replaced the fan on our C3 yet, but I know that is the right fan for a C1/C2 machine, I bet it is the same. Tim Roliff, tlroliff@covhealth.org Covenant Healthcare, Milwaukee, Wisconsin Clinical Engineering 414 874-4159 -----Original Message----- From: Scot Thiesson [mailto:sthiesson@scf.sk.ca] Sent: Tuesday, February 06, 2001 12:41 PM To: Linac Eng Subject: console fan replacement Does anyone know offhand the manufacturer and part number for the console fans on the 2100 C3 Linacs? This is the unit as per drawing 890475 item 14. The fan assembly is listed but not broken down. Scot Thiesson A.B.C.C. Regina SAsk. Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 6/100 SF-6 Leak Message-ID: From: Craig Pearce To: "'Watters, Dan'" Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 13:51:05 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dan and all Always release the pressure in the waveguide before you attempt to move the coupler. As one of the techs once found out here, that luckily the coupler was slightly larger then his eye. The outcome was bruising to both his pride and eyesocket. The leak has successfully stopped after that. I agree that one of the common leak areas is inside the N connector. It is important to mark the position very carefully both in angle and depth. Due to a few problems we once had on our older CL600C we sent the coupler out to a Radar shop and had the couplers set at 60 db. Directivity was measured at the same time. Now I know actually what the power reading are in both directions. The tip about loctite sounds like a good one. Take care when you move the couplers and good luck. Regards Craig Pearce Technical Officer Medical Physics and Clinical Engineering Auckland District Health Board Building 13 Auckland Hospital Auckland New Zealand Ph 649 3074949 ext. 6213 Fax 649 3078948 craigp@ahsl.co.nz ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Oldeflt third part service. Message-ID: From: Joseph Czarnecki To: linac-eng@plato1.aristotle.net Subject: Oldeflt third part service. Date: Tue, 6 Feb 2001 12:06:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Are there any third party vendors who do service on Oldeflt Simulix MC sims in the Midwest? Joseph M. Czarnecki Radiology & Imaging System Specialist III BJC Health Systems Clinical Engineering St. Louis, Missouri 63110 USA Work Telephone: 314.454.7101 email: joecz99@netzero.net jxc5307@bjc.org ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; name="Joseph Czarnecki.vcf" Content-Disposition: attachment; filename="Joseph Czarnecki.vcf" BEGIN:VCARD VERSION:2.1 X-GWTYPE:USER FN:Joseph Czarnecki TEL;WORK:454-7101 ORG:;Clinical Engineering TEL;PREF;FAX:747-4617 EMAIL;WORK;PREF;NGW:jxc5307@bjc.org N:Czarnecki;Joseph TITLE:RissII X-GWUSERID:jxc5307 END:VCARD ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian HE Accel Sol Message-ID: <001501c09072$13183940$ddc6d6d8@mshome.net> From: Richard Kimball To: Linac Listserv Subject: Varian HE Accel Sol Date: Tue, 6 Feb 2001 11:21:58 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, Does anyone know the proper way to center the accelerator solenoid on a HE Varian? Thanks, Rich Kimball ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 6/100 SF-6 Leak Message-ID: <852569EB.0065C4F9.00@mail.lrcc.on.ca> From: Bob.Tonks@lrcc.on.ca To: "Watters, Dan" , linac-eng@plato1.aristotle.net Subject: Re: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 10:31:35 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I went throught the pain of replacing these O-rings a few times and the fun of getting the AFC set back up again. Even the smallest misalignment can cause real headaches. The leak has normally been at the inside of the connector though. If the waveguide is de-pressurized and the connector cleaned with a zeroe residue cleaner, you can use a wicking locktite such as Loctite 290 to seal the connector. We have found that if the Loctite is left for 15-20 minutes then the remainder cleaned off with a Q-tip, the connector will be sealed and reader for service. We have done this to four connectors with great success and the best thing is it is real easy to do. Hope this helps, Bob Tonks London Regional Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: console fan replacement Message-ID: <3A80452F.E3BDAEBC@scf.sk.ca> From: Scot Thiesson To: Linac Eng Subject: console fan replacement Date: Tue, 6 Feb 2001 10:40:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Does anyone know offhand the manufacturer and part number for the console fans on the 2100 C3 Linacs? This is the unit as per drawing 890475 item 14. The fan assembly is listed but not broken down. Scot Thiesson A.B.C.C. Regina SAsk. Canada ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: GE Saturn III Message-ID: From: PilotDaveR@cs.com To: Linac-eng@plato1.aristotle.net Subject: GE Saturn III Date: Tue, 6 Feb 2001 10:04:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Anyone interested in a used GE Saturn III Machine? Its "FREE" This machine is in storage and did run prior to deinstallation. Do you need spares? If interested please email me directly. Thanks email : PilotDaveR@cs.com David Rodriguez ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 6/100 SF-6 Leak Message-ID: From: "Turner, Guy" To: 'Scot Thiesson' Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 10:10:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have fought leaks on those coax connectors on my old 6/100 for years. I used epoxy with good success. One comment on the 2100. I just finished an SF6 leak problem that I hadn't run into before. It was very hard to track down. I discovered that several of the rubber RF seals had degraded and had "hardened". They pretty much broke apart when I took them out. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Scot Thiesson [SMTP:sthiesson@scf.sk.ca] > Sent: Tuesday, February 06, 2001 10:57 AM > To: Orsolini, Joe D > Cc: 'linac-eng@plato1.aristotle.net' > Subject: Re: 6/100 SF-6 Leak > > Interesting discussion guys. We have had a slight leak on our 2100c3 now > for > awhile that we can't seem to nail down. > I am suspecting many very small leaks in a bunch of different locations. I > must > admit I didn't think to epoxy coat my coax cables though! > > Scot Thiesson > A.B.C.C. > Regina Sask. > Canada > > "Orsolini, Joe D" wrote: > > > We have found that the SF-6 actually leaks around the coax connectors > even > > after replacing the o rings. As far as I recall we received new o rings > when > > we converted from R-12 to SF-6. We pretty much coated the coax > connectors > > with epoxy to stem the flow, we still have a slight leak but its the > best we > > can get. > > > > > -----Original Message----- > > > From: Watters, Dan [SMTP:dwatters@umcaz.edu] > > > Sent: Tuesday, February 06, 2001 09:42 > > > To: 'linac-eng@plato1.aristotle.net' > > > Subject: 6/100 SF-6 Leak > > > > > > Hello All, > > > > > > I have a SF-6 leak at the forward power probe. Looking in the book I > > > don't > > > see any kind of "O" ring for this. Before I pull this item out I > thought > > > I > > > would gather the collective wisdom of the group on the best way of > > > repairing > > > this leak. I want to be prepared for any contingency before I start. > > > > > > As Always TIA, > > > > > > Dan Watters > > > UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 6/100 SF-6 Leak Message-ID: From: "Bush, Thomas M." To: "'Watters, Dan'" Cc: "'linac-eng@plato1.aristotle.net'" Subject: RE: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 09:09:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dan... I have had leaks at the power samplers also. Usually, it is the O-ring around the RF probe sampler assy. and the O-ring just needs to be replaced. Keep in mind that you should use a SMALL amount of vac grease on the o-ring for a better seal. Also, I have had the o-ring be ok but the leak actually through the center of the sampler. I have sucessfully used solder to correct this but the best way would be to replace the sampler in that case. Use Snnoop bubbles to be sure where the leak actually is prior to removal. Also, the advice by Steven (on this list-serv) was very important. You must put the origional power sampler at EXACTLY the same depth and orientation or depending upon the use of the sampler you may have other alignments to do! Best of luck. Tom Bush Sacred Heart Med Center Spokane, WA -----Original Message----- From: Watters, Dan [mailto:dwatters@umcaz.edu] Sent: Tuesday, February 06, 2001 6:42 AM To: 'linac-eng@plato1.aristotle.net' Subject: 6/100 SF-6 Leak Hello All, I have a SF-6 leak at the forward power probe. Looking in the book I don't see any kind of "O" ring for this. Before I pull this item out I thought I would gather the collective wisdom of the group on the best way of repairing this leak. I want to be prepared for any contingency before I start. As Always TIA, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 6/100 SF-6 Leak Message-ID: <3A802CEA.4CF8CD24@scf.sk.ca> From: Scot Thiesson To: "Orsolini, Joe D" Cc: "'linac-eng@plato1.aristotle.net'" Subject: Re: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 08:57:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Interesting discussion guys. We have had a slight leak on our 2100c3 now for awhile that we can't seem to nail down. I am suspecting many very small leaks in a bunch of different locations. I must admit I didn't think to epoxy coat my coax cables though! Scot Thiesson A.B.C.C. Regina Sask. Canada "Orsolini, Joe D" wrote: > We have found that the SF-6 actually leaks around the coax connectors even > after replacing the o rings. As far as I recall we received new o rings when > we converted from R-12 to SF-6. We pretty much coated the coax connectors > with epoxy to stem the flow, we still have a slight leak but its the best we > can get. > > > -----Original Message----- > > From: Watters, Dan [SMTP:dwatters@umcaz.edu] > > Sent: Tuesday, February 06, 2001 09:42 > > To: 'linac-eng@plato1.aristotle.net' > > Subject: 6/100 SF-6 Leak > > > > Hello All, > > > > I have a SF-6 leak at the forward power probe. Looking in the book I > > don't > > see any kind of "O" ring for this. Before I pull this item out I thought > > I > > would gather the collective wisdom of the group on the best way of > > repairing > > this leak. I want to be prepared for any contingency before I start. > > > > As Always TIA, > > > > Dan Watters > > UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 6/100 SF-6 Leak Message-ID: <4a.1115e5ff.27b182dd@aol.com> From: Virago1100@aol.com To: dwatters@umcaz.edu, linac-eng@plato1.aristotle.net Subject: Re: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 08:39:57 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dan, There is an O-ring on the directional coupler, it does sometimes leak but I have found that more commonly the leak is inside at the potting where the antenna feeds thru to the center pin of the N type connector. Usually this can be verified by a sniffer/leak detector stuck in the end of the connector. If you remove the directional coupler, mark its rotational position and depth beforehand. I believe that RadParts (1-877-704-3838) carries both the O-ring and the directional coupler. Jim McKenzie ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 6/100 SF-6 Leak Message-ID: From: "Orsolini, Joe D" To: "'linac-eng@plato1.aristotle.net'" Subject: RE: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 08:43:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have found that the SF-6 actually leaks around the coax connectors even after replacing the o rings. As far as I recall we received new o rings when we converted from R-12 to SF-6. We pretty much coated the coax connectors with epoxy to stem the flow, we still have a slight leak but its the best we can get. > -----Original Message----- > From: Watters, Dan [SMTP:dwatters@umcaz.edu] > Sent: Tuesday, February 06, 2001 09:42 > To: 'linac-eng@plato1.aristotle.net' > Subject: 6/100 SF-6 Leak > > Hello All, > > I have a SF-6 leak at the forward power probe. Looking in the book I > don't > see any kind of "O" ring for this. Before I pull this item out I thought > I > would gather the collective wisdom of the group on the best way of > repairing > this leak. I want to be prepared for any contingency before I start. > > As Always TIA, > > Dan Watters > UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 6/100 SF-6 Leak Message-ID: From: "Kloster, Stephen" To: "'Watters, Dan'" , "'linac-eng@plato1.aristotle.net'" Subject: RE: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 07:44:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Dan, I've never changed one of these myself, but you should keep in mind that both depth and rotation of the probe should be marked before you take it out so you can achieve exactly the same alignment after you replace the 0-ring. Regards, Steve Kloster Kingston RCC -----Original Message----- From: Watters, Dan [mailto:dwatters@umcaz.edu] Sent: Tuesday, February 06, 2001 9:42 AM To: 'linac-eng@plato1.aristotle.net' Subject: 6/100 SF-6 Leak Hello All, I have a SF-6 leak at the forward power probe. Looking in the book I don't see any kind of "O" ring for this. Before I pull this item out I thought I would gather the collective wisdom of the group on the best way of repairing this leak. I want to be prepared for any contingency before I start. As Always TIA, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 6/100 SF-6 Leak Message-ID: <6CE096D0CDF4D211A3110008C75D07523605B4@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: 6/100 SF-6 Leak Date: Tue, 6 Feb 2001 06:42:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, I have a SF-6 leak at the forward power probe. Looking in the book I don't see any kind of "O" ring for this. Before I pull this item out I thought I would gather the collective wisdom of the group on the best way of repairing this leak. I want to be prepared for any contingency before I start. As Always TIA, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600C Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF954@phsexch6.partners.org> From: "Maddox, Jerry" To: 'Darrell Poole ' , ''linac eng' ' Subject: RE: 600C Date: Tue, 6 Feb 2001 04:29:28 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" In service mode, what do you see on the motor status display when you try a motion? The enable, command, and velocity signals there may help pin it down some. Are console motions gone too? Key interlock? If you have version 5 software, HWFA will create an event log. There are many pcbs that will shut down motions if they detect abnormal conditions, and your problem is intermittent, so you will probably do a lot of troubleshooting by substitution. Essential to have spares! An alternative to shutdown is to reset the std bus in stdby. A few conditions can be cleared with a soft reboot, no warmup. Any ghosts in your hospital? It will be interesting to read your solution. -----Original Message----- From: Darrell Poole To: 'linac eng' Sent: 2/5/01 11:49 AM Subject: 600C For no apparent reason and with no one operating the machine, we lose all motor motions. No gantry rotation, no collimator rotation and no couch movements. The only cure we have found is to shut down completely and restart. This happens randomly throughout the day. Any suggestions? -- Darrell O. Poole M.D. Anderson Cancer Center Orlando 407.628.0991 407.721.2658 CELL (Usually the quickest) 407.628.8463 FAX dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Water Systems on Varian Linacs Message-ID: <3AE23899EECFD411B2210008C7B2BF399F5074@wmhmail.whs.org> From: "Williams, Rod" To: "'linac-eng@plato1.aristotle.net'" Subject: Water Systems on Varian Linacs Date: Tue, 6 Feb 2001 03:44:39 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Well it looks like it is official, there is a STB out on removing the Culligan Deionizer on your Linacs, Varian is going to be selling a filter, and some Biocide. This new water setup is on back order so I don't know how long before we will be able to get it in our hands.You might want to check with your local rep, as you know STBs are TOP SECRET. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600C Message-ID: <002FABF0.C21492@advocatehealth.com> From: Kerry.Price@advocatehealth.com To: 'linac eng' , dopoole@ieee.org Subject: Re: 600C Date: Mon, 5 Feb 2001 09:49:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Are you getting an HWFA interlock? ______________________________ Reply Separator _________________________________ Subject: 600C Author: dopoole@ieee.org at PO_EXTERNET Date: 02/05/2001 11:49 AM For no apparent reason and with no one operating the machine, we lose all motor motions. No gantry rotation, no collimator rotation and no couch movements. The only cure we have found is to shut down completely and restart. This happens randomly throughout the day. Any suggestions? -- Darrell O. Poole M.D. Anderson Cancer Center Orlando 407.628.0991 407.721.2658 CELL (Usually the quickest) 407.628.8463 FAX dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600C Message-ID: <3A7EE4DB.BD24A23E@wfubmc.edu> From: tcullen@wfubmc.edu To: dopoole@ieee.org Cc: 'linac eng' Subject: Re: 600C Date: Mon, 5 Feb 2001 09:37:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Darrell, ....next time mode an energy up and look at the yellow box to see what interlocks are present when this is happening. More than likely it is a HWFA I/L. You can press enter to clear this, unless the problem is still active. Causes usually are position readout (PRO) potentiometer related. Either the primary or secondary potentiometer is failing. You can go to the Communication module and look see what actually caused this. If for instance the gantry PRO is the cause you may see the readout in the clinical mode screen fluctuating. Same thing if the Y collimators are the problem. Nine out of ten times there is a "special" spot this occurs in the pot's travel so usually you notice it during the same patient setup daily. Now if there is a broken wire either on the pot itself or in the cable bundle going to the pot, then it's usually more random in nature. Hope this helps. Darrell Poole wrote: > For no apparent reason and with no one operating the machine, we lose > all motor motions. No gantry rotation, no collimator rotation and no > couch movements. The only cure we have found is to shut down completely > and restart. This happens randomly throughout the day. Any suggestions? > > -- > Darrell O. Poole > M.D. Anderson Cancer Center Orlando > 407.628.0991 > 407.721.2658 CELL (Usually the quickest) > 407.628.8463 FAX > dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600C Message-ID: From: "Lapenna, Russ" To: "'dopoole@ieee.org'" , 'linac eng' Subject: RE: 600C Date: Mon, 5 Feb 2001 09:17:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" You may want to try pushing the red button on the collimator. Just kidding, sorry couldn't resist. Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 > > For no apparent reason and with no one operating the machine, we lose > all motor motions. No gantry rotation, no collimator rotation and no > couch movements. The only cure we have found is to shut down > completely > and restart. This happens randomly throughout the day. Any > suggestions? > > -- > Darrell O. Poole > M.D. Anderson Cancer Center Orlando > 407.628.0991 > 407.721.2658 CELL (Usually the quickest) > 407.628.8463 FAX > dopoole@ieee.org > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 600C Message-ID: <3A7ED97C.67AD4C0@ieee.org> From: Darrell Poole Reply-To: dopoole@ieee.org To: 'linac eng' Subject: 600C Date: Mon, 5 Feb 2001 08:49:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" For no apparent reason and with no one operating the machine, we lose all motor motions. No gantry rotation, no collimator rotation and no couch movements. The only cure we have found is to shut down completely and restart. This happens randomly throughout the day. Any suggestions? -- Darrell O. Poole M.D. Anderson Cancer Center Orlando 407.628.0991 407.721.2658 CELL (Usually the quickest) 407.628.8463 FAX dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Position Available: Radiation Oncology Service Engineer Message-ID: <202F77353143D211B82D00C04FB2423C117A50@MAILSERVER.XRT.UPENN.EDU> From: "Kreider, Rick" To: "'linac-eng@plato1.aristotle.net'" Subject: Position Available: Radiation Oncology Service Engineer Date: Fri, 2 Feb 2001 10:32:03 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: application/msword; name="Service Engineering Position.doc" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Service Engineering Position.doc" 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAABAAAAKQAAAAAAAAAA EAAAKwAAAAEAAAD+////AAAAACgAAAD///////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// 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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAA= ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MLC 80 - 100 cond.cables Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net Subject: MLC 80 - 100 cond.cables Date: Fri, 2 Feb 2001 06:59:18 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello all, A while back someone ( maybe Tom Bush ) asked me if I had any experience with the longevity of the newer style MLC 1101099-03 type 100 conductor potted end ribbon cables. They develope a sharp bend close to the P41 connector on the Interconnect PCB, and this appeared to be a possible area for intermittance. I can now report that the first one of these I installed on July 24/00 had to be replaced Jan 31/01. Thats only 6 months of operation ... Since July, I've installed several others. I always write the date installed on them - I'll let you know if more fail. David Burgess Nova Scotia Cancer Centre ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Beg, Borrow or Buy Message-ID: <3A7ABD06.E5AE212C@ieee.org> From: Darrell Poole Reply-To: dopoole@ieee.org To: 'linac eng' Subject: Beg, Borrow or Buy Date: Fri, 2 Feb 2001 05:58:30 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I need to beg, borrow or buy pictures of Toshiba's multileaf collimator from the 1970's and Toshiba's Transverse Axis Tomographic unit (TAT) that we attached to their simulator (LX-4), same era. Personally I had one each of these collimators on the LMR-13 accelerator and RCR-120 Cobalt unit, and the TAT, but have long since lost all records. Any contributions and/or suggestions would be appreciated. -- Darrell O. Poole M.D. Anderson Cancer Center Orlando 407.628.0991 407.721.2658 CELL (Usually the quickest) 407.628.8463 FAX dopoole@ieee.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: CHR Sterilizer Repairs Message-ID: From: "McIlroy, Donald" To: "Wilson, Jim" Subject: RE: CHR Sterilizer Repairs Date: Thu, 1 Feb 2001 19:46:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am hoping with the flood of Emails that this has been clarified. We have new guys in a new situation with an old problem of not enough people. Not to mention me and my four thumbs trying to get a handle on all this. Hang with me and my guys.-MAC > -----Original Message----- > From: Wilson, Jim > Sent: Thursday, February 01, 2001 3:51 PM > To: McIlroy, Donald > Subject: RE: CHR Sterilizer Repairs > > Your CHR guys don't know when to work on a sterilizer and when not to and > have been calling Gary directly. > > -----Original Message----- > From: McIlroy, Donald > Sent: Wednesday, January 31, 2001 9:29 PM > To: Wilson, Jim; Gordon, Michael; Applebee, Emmett; Bushnell, > Robert; Collins, Ken; Farnham, Don; Fein, David; Greenlee, Mark; Kechter, > Jeff; Luckeroth, Joe; Pasion, Alden; Pearce, Ed; Scardigli, Wayne; > Simmons, Phillip; Stober, Gary; Thompson, Steve > Cc: Menken, Dean; Coleman, Paul; Leeder, Mike; Kaufman, John; > McMahan, Robert > Subject: RE: CHR Sterilizer Repairs > > No NO NO! all CHR Sterilizer calls should be directed to Dean > Menken. If he can not be reached leave a message and try John Kaufman. > If he can not be reached leave a message and call Bob McMahan. If he is > not in Leave a message and then call me and I will do the fallow up. > > -----Original Message----- > From: Wilson, Jim > Sent: Wednesday, January 31, 2001 4:01 PM > To: Gordon, Michael; McIlroy, Donald; Applebee, Emmett; > Bushnell, Robert; Collins, Ken; Farnham, Don; Fein, David; Greenlee, Mark; > Kechter, Jeff; Luckeroth, Joe; Pasion, Alden; Pearce, Ed; Scardigli, > Wayne; Simmons, Phillip; Stober, Gary; Thompson, Steve > Cc: Menken, Dean > Subject: CHR Sterilizer Repairs > > Please contact Don McIlroy with all CHR sterilizer repairs. > At this point he is the primary person in charge of assigning the repair > person. At no time should you contact Gary Cuppy directly. If Don is not > available please see your senior technician for assistance. Thanks! ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C carrousel Message-ID: From: david hall Reply-To: hall.david@lycos.com To: Dave Pinchin , lenj@CancerBoard.ab.ca Cc: linac-eng@plato1.aristotle.net, clfikes@mail.mdanderson.org Subject: Re: Varian 2100C carrousel Date: Thu, 1 Feb 2001 19:04:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, Does R3 burn? Regards, David Hall -- On Thu, 1 Feb 2001 14:37:36 Leonard C. Johnson wrote: >We have also had the SSR's go half-wave. You reminded me of >the smoke smell etc. >Len > >On Fri, 02 Feb 2001 08:33:43 +1300 Dave Pinchin > wrote: > >> G'day, >> I've just had this problem myself (#40). It occurs at >> intervals. In our case it was the SSR on the PCB adjacent >> (fiter & target interlock). This one turns on the 110VAC to >> the stepper driver system. The SSR has a tendency to >> 1/2wave rather than fully conduct. This then saturates the >> core of the tranny letting all the smoke out. As it does >> this intermittently (on a cycle by cycle basis) the motor >> runs VERY roughly. >> >> Another thing to check is the stepper motor wires >> themselves. I have seen the insulation hanging off (with >> radiation damage???). >> >> I believe the SSR is available as a seperate part. >> >> Good luck >> Dave >> >> >> >>> 2/02/01 05:37:52 >>> >> We have a noisy carrousel stepping motor on our 2100C #95, >> which still uses the Stepper Driver PCB. Does anyone have >> a good procedure to set up this board? >> >> Chad Fikes >> MD Anderson Cancer Center >> clfikes@mdanderson.org >> >> >> >> >> >> ** This email and attachments have been scanned for content >> and viruses and is believed to be clean ** >> >> This email or attachments may contain confidential or >> legally privileged information intended for the sole use of >> the addressee(s). Any use, redistribution, disclosure, or >> reproduction of this message, except as intended, is >> prohibited. If you received this email in error, please >> notify the sender and remove all copies of the message, >> including any attachments. Any views or opinions expressed >> in this email (unless otherwise stated) may not represent >> those of Canterbury District Health Board. > >---------------------- >Leonard C. Johnson >lenj@cancerboard.ab.ca > > Get your small business started at Lycos Small Business at http://www.lycos.com/business/mail.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C carrousel Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: Dave Pinchin Cc: linac-eng@plato1.aristotle.net, clfikes@mail.mdanderson.org Subject: Re: Varian 2100C carrousel Date: Thu, 1 Feb 2001 13:37:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have also had the SSR's go half-wave. You reminded me of the smoke smell etc. Len On Fri, 02 Feb 2001 08:33:43 +1300 Dave Pinchin wrote: > G'day, > I've just had this problem myself (#40). It occurs at > intervals. In our case it was the SSR on the PCB adjacent > (fiter & target interlock). This one turns on the 110VAC to > the stepper driver system. The SSR has a tendency to > 1/2wave rather than fully conduct. This then saturates the > core of the tranny letting all the smoke out. As it does > this intermittently (on a cycle by cycle basis) the motor > runs VERY roughly. > > Another thing to check is the stepper motor wires > themselves. I have seen the insulation hanging off (with > radiation damage???). > > I believe the SSR is available as a seperate part. > > Good luck > Dave > > > >>> 2/02/01 05:37:52 >>> > We have a noisy carrousel stepping motor on our 2100C #95, > which still uses the Stepper Driver PCB. Does anyone have > a good procedure to set up this board? > > Chad Fikes > MD Anderson Cancer Center > clfikes@mdanderson.org > > > > > > ** This email and attachments have been scanned for content > and viruses and is believed to be clean ** > > This email or attachments may contain confidential or > legally privileged information intended for the sole use of > the addressee(s). Any use, redistribution, disclosure, or > reproduction of this message, except as intended, is > prohibited. If you received this email in error, please > notify the sender and remove all copies of the message, > including any attachments. Any views or opinions expressed > in this email (unless otherwise stated) may not represent > those of Canterbury District Health Board. ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C carrousel Message-ID: From: Dave Pinchin To: clfikes@mail.mdanderson.org Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C carrousel Date: Thu, 1 Feb 2001 11:33:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" G'day, I've just had this problem myself (#40). It occurs at intervals. In our case it was the SSR on the PCB adjacent (fiter & target interlock). This one turns on the 110VAC to the stepper driver system. The SSR has a tendency to 1/2wave rather than fully conduct. This then saturates the core of the tranny letting all the smoke out. As it does this intermittently (on a cycle by cycle basis) the motor runs VERY roughly. Another thing to check is the stepper motor wires themselves. I have seen the insulation hanging off (with radiation damage???). I believe the SSR is available as a seperate part. Good luck Dave >>> 2/02/01 05:37:52 >>> We have a noisy carrousel stepping motor on our 2100C #95, which still uses the Stepper Driver PCB. Does anyone have a good procedure to set up this board? Chad Fikes MD Anderson Cancer Center clfikes@mdanderson.org ** This email and attachments have been scanned for content and viruses and is believed to be clean ** This email or attachments may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury District Health Board. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian 2100C carrousel Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: clfikes@mail.mdanderson.org Cc: linac-eng@plato1.aristotle.net Subject: Re: Varian 2100C carrousel Date: Thu, 1 Feb 2001 10:36:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Chad, I have an instruction manual from Superior Electric (the manufacturer of the Slo-Syn type STM103 translator module) that I could fax to you. It contains some set up and adjustment information that might help. Please send me your fax number. Len On Thu, 1 Feb 2001 10:37:52 -0600 clfikes@mail.mdanderson.org wrote: > We have a noisy carrousel stepping motor on our 2100C #95, > which still uses the Stepper Driver PCB. Does anyone have > a good procedure to set up this board? > > Chad Fikes > MD Anderson Cancer Center > clfikes@mdanderson.org > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100C carrousel Message-ID: <862569E6.005CCC98.00@utm-notes-m2.mdacc.tmc.edu> From: clfikes@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: Varian 2100C carrousel Date: Thu, 1 Feb 2001 08:37:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We have a noisy carrousel stepping motor on our 2100C #95, which still uses the Stepper Driver PCB. Does anyone have a good procedure to set up this board? Chad Fikes MD Anderson Cancer Center clfikes@mdanderson.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: COLL, ACC, CTRL Message-ID: From: Torben Gade To: linac-eng@plato1.aristotle.net Subject: COLL, ACC, CTRL Date: Mon, 29 Jan 2001 02:04:13 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello I have a problem with a Varian C2100, #85. Sometimes and special in 16 e and 20 e I have a problem with COLL and ACC interlocks and sometimes they will be followed by a CTRL interlock. The problems happens under Beam On. I have an idea that it must be some noise. Any idea or proposal. ??? Torben Gade Aalborg Sygehus Syd Denmark ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: who Message-ID: From: Torben Gade To: linac-eng@plato1.aristotle.net Subject: who Date: Sun, 28 Jan 2001 23:22:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Collimator service equipment for Siemens. Message-ID: <862569E0.005B72A6.00@notesmta02.allina.com> From: "Jonathan E. Cook" To: linac-eng@plato1.aristotle.net Subject: Collimator service equipment for Siemens. Date: Fri, 26 Jan 2001 08:44:10 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am a relative newcomer to Linac service. We have a Primus with a MLC and a KD2 with a standard collimator. What type of hoist and hardware works the best for service on the upper defining head since either the MLC or the standard collimator have to be pulled in order to access certain parts of the upper head. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens CD Message-ID: <3AE23899EECFD411B2210008C7B2BF399F506F@wmhmail.whs.org> From: "Williams, Rod" To: "'Watters, Dan'" , "'linac-eng@plato1.aristotle.net'" Subject: RE: Siemens CD Date: Fri, 26 Jan 2001 06:13:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Good Morning to you all in Siemens land, I was wondering if your local service people keep you informed on the latest upgrades and technical service bulletins for your machines, Varian has some customer bulletins available but most of the ones that would keep the machines running, and in good shape are kept confidential. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Watters, Dan [SMTP:dwatters@umcaz.edu] > Sent: Thursday, January 25, 2001 3:43 PM > To: 'linac-eng@plato1.aristotle.net' > Subject: Siemens CD > > Hello All, > > I would like to thank everyone who responded to my inquiry about the > Siemens > parts CD-ROM. I would also like to thank Siemens for the information they > provided and their kind offer concerning this CD. I, for one, am very > appreciative of the fact that they monitor this list and provide these > services to us. > > Thanks Again, > > Dan Watters > Radiology Engineering > UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Software versions Message-ID: <3A642D7B0006FC56@relay.nhs.uk> (added by postmaster@relay.nhs.uk) From: "Coley Chris (RDE) Essex Rivers" To: linac-eng@plato1.aristotle.net Subject: Software versions Date: Fri, 26 Jan 2001 01:29:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear All Could anybody tell me the differences between version 5.4 and 6 on a Varian 2100C console computer. Thanks in advance. Chris Coley (Technician) Essex County Hospital ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens CD Message-ID: <6CE096D0CDF4D211A3110008C75D0752360597@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Siemens CD Date: Thu, 25 Jan 2001 13:42:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello All, I would like to thank everyone who responded to my inquiry about the Siemens parts CD-ROM. I would also like to thank Siemens for the information they provided and their kind offer concerning this CD. I, for one, am very appreciative of the fact that they monitor this list and provide these services to us. Thanks Again, Dan Watters Radiology Engineering UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Trade Publications Message-ID: <000801c08702$f7aa6e80$2d66aec7@techop.com> From: technical options To: rtexec , linac-eng@plato1.aristotle.net Subject: Re: Trade Publications Date: Thu, 25 Jan 2001 11:13:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Sidney, Here are some options for you, magazine-wise: Medical Imaging 401-455-0555 www.medicalimagingmag.com Advance Radiology & Radiation Oncology 800-355-1088 www.advanceforAR.com Both of these magazines sound like what you are looking for. Hope this info helps. Lisa Przepasniak Technical Options of Georgia, Inc. ----- Original Message ----- From: rtexec To: Sent: Thursday, January 25, 2001 10:47 AM Subject: Trade Publications > I am searching for any trade publication (magazine or journal etc.) that > has information on radiotherapy technology such as accelerators, > treatment planning systems, V&R networks, portal imaging or anything > along those lines. Manufacturers marketing pamphlets and web sites are > fine but do not go into the technology at all. I need a larger view. > Searching the web has not been successful. Can anyone please help me? > > Thanks in advance for any replies > Sidney Mauck > RT Exec > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Trade Publications Message-ID: <4.1.20010125092903.009fdd30@radonc17.ucsf.edu> From: John Somers To: rtexec , linac-eng@plato1.aristotle.net Subject: Re: Trade Publications Date: Thu, 25 Jan 2001 06:30:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" What's a RT Exec? At 11:47 PM 1/25/01 +0800, rtexec wrote: >I am searching for any trade publication (magazine or journal etc.) that >has information on radiotherapy technology such as accelerators, >treatment planning systems, V&R networks, portal imaging or anything >along those lines. Manufacturers marketing pamphlets and web sites are >fine but do not go into the technology at all. I need a larger view. >Searching the web has not been successful. Can anyone please help me? > >Thanks in advance for any replies >Sidney Mauck >RT Exec > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Trade Publications Message-ID: <3A704A78.F3980268@pd.jaring.my> From: rtexec To: linac-eng@plato1.aristotle.net Subject: Trade Publications Date: Thu, 25 Jan 2001 07:47:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I am searching for any trade publication (magazine or journal etc.) that has information on radiotherapy technology such as accelerators, treatment planning systems, V&R networks, portal imaging or anything along those lines. Manufacturers marketing pamphlets and web sites are fine but do not go into the technology at all. I need a larger view. Searching the web has not been successful. Can anyone please help me? Thanks in advance for any replies Sidney Mauck RT Exec ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Address Message-ID: From: "Heil, Ben" To: "'RSAINC1@aol.com'" , Linac-eng@plato1.aristotle.net Subject: RE: Address Date: Wed, 24 Jan 2001 15:42:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" ProComm 1105 Industrial Pkwy Brick, NJ 08724-2507 Phone: (732) 206-0660 Fax: (732) 458-1919 Benjamin Heil Electronics Engineering Technologist Hamilton Regional Cancer Centre -----Original Message----- From: RSAINC1@aol.com [mailto:RSAINC1@aol.com] Sent: Wednesday, January 24, 2001 6:26 PM To: Linac-eng@plato1.aristotle.net Subject: Address I seem to have lost my address and Phone number to ProCom for RF Drivers. Can anyone help? Roger ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Address Message-ID: <9e.f2bde3a.27a0bea1@aol.com> From: RSAINC1@aol.com To: Linac-eng@plato1.aristotle.net Subject: Address Date: Wed, 24 Jan 2001 15:26:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I seem to have lost my address and Phone number to ProCom for RF Drivers. Can anyone help? Roger ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 600C DS12 Servo Timer Fail Message-ID: From: Kerry Clark To: "'kevinpueschel@worldnet.att.net'" , Linac-eng list Subject: RE: 600C DS12 Servo Timer Fail Date: Wed, 24 Jan 2001 10:49:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" HI, we have a Varian 600 sn 483, we were seeing these DS12s up to 3 times a day. Our local Varian guy put some filtering on the control timer PCB to reduce them to about three times a week. We believe they are the result of noise from the PFN or Magnetron, as we see a marked increase just before we see Mod I/Ls and have to reprocess. We also have similar problems with one of our 2100's sn 1148, but with less frequency. At the moment we are watching the new thyratron that Varian has suggested will sort out our problems. The DS12's are increasing again and watching how much the machine wants to change the PRF every morning, so I don't think we have seen the end of it. Kerry. > -----Original Message----- > From: kevinpueschel@worldnet.att.net [SMTP:kevinpueschel@worldnet.att.net] > Sent: Wednesday, 24 January 2001 05:11 > To: Linac-eng list > Subject: 600C DS12 Servo Timer Fail > > I have a Varian 600C with Ver 5.2 software. Every 3 to 4 months, This > machine throws several DS12 faults > (04 - Servo Timer Error ) over a period of several days then runs fine > for another 3-4 months. The fault clears and the machine runs normally. I > have swapped out the control timer PCB without any change in symptoms.Does > anybody have a detailed explanation of the servo timer interlock? If > anyone else has experienced anything similar, I'd like to hear from you. > > Kevin Pueschel > Center for Radiation Oncology ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Theraplan Message-ID: <3A6F253A.355A5903@hsc.vcu.edu> From: Christopher L Bartee To: linac-eng@plato1.aristotle.net Subject: Theraplan Date: Wed, 24 Jan 2001 10:55:55 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have an old AECL theraplan system. Recently (10 mins ago) one of the connectors that provides 5 volts smoked. I am fishing to see if anybody has an old system they would like to part with, or old parts. This is an AECL Theratronics series 400 theraplan treatment planning system. Of course thertronics does not support this equipment anymore. Any information please email or call 804-628-0977 Thanks, Christopher L. Bartee Research Associate Medical College of Virginia ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Millennimum MLC Morning Start Up Message-ID: <3A6EE370.FA97B1F0@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" , "Medical Physics, Listserver" Subject: Millennimum MLC Morning Start Up Date: Wed, 24 Jan 2001 06:15:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Happy New Year Again! We think we have found the answer to a question I posted last year in November involving the correct sequence for starting the Millennium MLC. We have a 120 leaf Millennium MLC and are using Varis Treatment instead of the MLC Treatment Workstation. We have combined the Varis Treatment Workstation and the MLC treatment workstation on one computer. We were experiencing problems during start up. Many people answered and I want to thank you. Below is the procedure that we have found to bring up the MLC with the least confusion and know what is happening. 1. Turn on the Machine, the VI/IRM and the Varis/MLC Computer. DO NOT TURN ON the MLC Controller. 2. Make sure the gantry and collimator are at 180 degrees and that there are no electron cones in place. 3. When the Hyperterminal logo disappears on the Varis/MLC Computer screen there will be three beeps and the Hyperterminal button will be activated in the task bar. 4. Click the Hyperterminal Button in the task bar and you will get a blank Hyperterminal Screen. 5. At this time TURN ON THE MLC CONTROLLER. 6. Let the MLC Controller run its full course. If there are any problems with the MLC the Hyperterminal screen will show it and you will not get a READY message. 7. Wait till you get the message line MLC 2 READY . This may be around 3 minutes after the leaf information stops and nothing is changing on the Hyperterminal screen. 8. Now bring up Varis Treatment. This eliminates any communication problems. 9. In Varis Treatment Go to Standby mode. With in 10 to 20 seconds you should see the MLC screen go into PARKED mode. 10. Proceed with Morning Run UP or what ever you do. 11. Start treating Patients. Hyperterminal is used to monitor the MLC Controller so you want it on before you initialize. If the MLC controller is turned on before Hyperterminal comes fully up, then you loose any information from the MLC Controller up to that point. This was our problem. We were starting the Varis/MLC Computer and MLC Controller around the same time. By the time Hyperterminal was activated the initialization was at leaf 45, so we did not know what happened before. Also if you have problems during the day and have to reinitialize the MLC just drop out of the treatment program completely, do not shut down the Varis/MLC Computer, just bring up the Hyperterminal screen, shut down the MLC Controller and turn it back on. Initialization is now started. You can now follow the whole process and find out what is happening. You can also scroll down the Hyperterminal Screen, it becomes gray, and see what happened previously during the day with the MLC. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 600C DS12 Servo Timer Fail Message-ID: <852569DE.004C24E1.00@mail.lrcc.on.ca> From: Randy.McVittie@lrcc.on.ca To: kevinpueschel@worldnet.att.net Cc: Linac-eng list Subject: Re: 600C DS12 Servo Timer Fail Date: Wed, 24 Jan 2001 05:51:40 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have seen this happen on one of our 2100CD's here in London. It has not happened with any regularity to cause me any concern, just one of those things that came and went. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 2100cd beam problems Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF94D@phsexch6.partners.org> From: "Maddox, Jerry" To: "'Leonard C. Johnson '" , "'JDDIHWRR@aol.com '" Cc: "'linac-eng@plato1.aristotle.net '" Subject: RE: 2100cd beam problems Date: Tue, 23 Jan 2001 12:13:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Len, good point. Been fighting a Ds12 interlock during the test cycle, HWFA, which turned out to be an intermittent connection at the gantry patch. Jerry -----Original Message----- From: Leonard C. Johnson To: JDDIHWRR@aol.com Cc: linac-eng@plato1.aristotle.net Sent: 1/23/01 10:57 AM Subject: Re: 2100cd beam problems Jerry; Another thing to check is the Accel. Solenoid power supply output current. Since the power supply and all of it's connections are part of the gantry and therefore rotate with the gantry the output could be changing with gantry angles. We once found loose connections on the rear terminal strip of the power supply. Len On Mon, 22 Jan 2001 10:36:15 EST JDDIHWRR@aol.com wrote: > I have finally decide to break the ice and post a request > on the site. I havw a 2100c/d, SN#688, that i have started > experiencing a strange anomaly with the 6/9e > beams. Reproducibility Vs, gantry angle is changing. > on inspection we have determined that the solenoid is in > fact locked in place and not moving. We found that the dose > rate is changing with gantry location, leading us to think > that the dose calibration is changing. We did find we could > change the greatest discrepency between gantry angles by > adjusting Bun-R/T, and SOLI. As we changed adjustments, and > then rotated the gantry the greatest change in dose > difference would actually swap to another gantry angle. The > largest difference was measured at 4.2%. Varian tolerance > is 2% for this test. Our physicist has test data for the > years 1998 and 1999 that shows this machine was well below > 1%. However in whe he did his annual calibration this year, > he found this machine to be 3-4% out of > tolerance. Gentlemen, any advice will be greatly > appreciated on this problem. I thank you in advance. Jerry > D. Dukes BioMed Department > Christus-St.Michael Health Care Center Texarkana, Tx. ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Electa Message-ID: <002201c08575$92985ae0$b10c45cf@martha> From: Daryl Knox To: Linac-Group Subject: Electa Date: Tue, 23 Jan 2001 11:49:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I would like to get the info on the new Electa machines as far as maintenance and treatmant as compaired to Varian. I have worked on Varian for 13 years so I'm partial. Don't hold back. Daryl Knox ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 600C DS12 Servo Timer Fail Message-ID: <001e01c08557$0e7d1020$0500a8c0@gtei.net.dsl.gtei.net> From: kevinpueschel@worldnet.att.net To: Linac-eng list Subject: 600C DS12 Servo Timer Fail Date: Tue, 23 Jan 2001 08:10:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have a Varian 600C with Ver 5.2 software. Every 3 to 4 months, This machine throws several DS12 faults (04 - Servo Timer Error ) over a period of several days then runs fine for another 3-4 months. The fault clears and the machine runs normally. I have swapped out the control timer PCB without any change in symptoms.Does anybody have a detailed explanation of the servo timer interlock? If anyone else has experienced anything similar, I'd like to hear from you. Kevin Pueschel Center for Radiation Oncology ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 2100cd beam problems Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: JDDIHWRR@aol.com Cc: linac-eng@plato1.aristotle.net Subject: Re: 2100cd beam problems Date: Tue, 23 Jan 2001 07:57:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jerry; Another thing to check is the Accel. Solenoid power supply output current. Since the power supply and all of it's connections are part of the gantry and therefore rotate with the gantry the output could be changing with gantry angles. We once found loose connections on the rear terminal strip of the power supply. Len On Mon, 22 Jan 2001 10:36:15 EST JDDIHWRR@aol.com wrote: > I have finally decide to break the ice and post a request > on the site. I havw a 2100c/d, SN#688, that i have started > experiencing a strange anomaly with the 6/9e > beams. Reproducibility Vs, gantry angle is changing. > on inspection we have determined that the solenoid is in > fact locked in place and not moving. We found that the dose > rate is changing with gantry location, leading us to think > that the dose calibration is changing. We did find we could > change the greatest discrepency between gantry angles by > adjusting Bun-R/T, and SOLI. As we changed adjustments, and > then rotated the gantry the greatest change in dose > difference would actually swap to another gantry angle. The > largest difference was measured at 4.2%. Varian tolerance > is 2% for this test. Our physicist has test data for the > years 1998 and 1999 that shows this machine was well below > 1%. However in whe he did his annual calibration this year, > he found this machine to be 3-4% out of > tolerance. Gentlemen, any advice will be greatly > appreciated on this problem. I thank you in advance. Jerry > D. Dukes BioMed Department > Christus-St.Michael Health Care Center Texarkana, Tx. ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: 2100cd beam problems Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF94A@phsexch6.partners.org> From: "Maddox, Jerry" To: "'JDDIHWRR@aol.com '" , "'linac-eng@plato1.aristotle.net '" Subject: RE: 2100cd beam problems Date: Tue, 23 Jan 2001 06:30:33 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Your symptoms sure sound like the loose waveguide I saw. The energy which is steered closest to the wall, and the lowest ones, tend to be first affected. The steering currents change significantly, and when I looked closely all modes'steering currents were changing at the same gantry angles. Some questions: Any symmetry changes vs angle? Both mu's tracking? You are changing steering, which would be affected by a mechanical alignment shift, energy changes, or magnetic field changes. For magnetic field changes, water, new MRI's, transformers, cables, angle servoes/ion chamber come to mind. For energy changes, AFC. Energy in 6,9 electrons is not affected by the gun. Recently heard of a case where water on a chamber was changing electron dose calibration, different brand. Hope this gives you some ideas and starts the discussion. Look forward to hearing the answer. -----Original Message----- From: JDDIHWRR@aol.com To: linac-eng@plato1.aristotle.net Sent: 1/22/01 10:36 AM Subject: 2100cd beam problems I have finally decide to break the ice and post a request on the site. I havw a 2100c/d, SN#688, that i have started experiencing a strange anomaly with the 6/9e beams. Reproducibility Vs, gantry angle is changing. on inspection we have determined that the solenoid is in fact locked in place and not moving. We found that the dose rate is changing with gantry location, leading us to think that the dose calibration is changing. We did find we could change the greatest discrepency between gantry angles by adjusting Bun-R/T, and SOLI. As we changed adjustments, and then rotated the gantry the greatest change in dose difference would actually swap to another gantry angle. The largest difference was measured at 4.2%. Varian tolerance is 2% for this test. Our physicist has test data for the years 1998 and 1999 that shows this machine was well below 1%. However in whe he did his annual calibration this year, he found this machine to be 3-4% out of tolerance. Gentlemen, any advice will be greatly appreciated on this problem. I thank you in advance. Jerry D. Dukes BioMed Department Christus-St.Michael Health Care Center Texarkana, Tx. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens Parts CD-ROM Message-ID: From: "Orsolini, Joe D" To: "''linac-eng@plato1.aristotle.net' '" Subject: RE: Siemens Parts CD-ROM Date: Mon, 22 Jan 2001 18:38:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I agree, and ditto for Varian accelerators. I have seen Siemens diagnostic x-ray group parts CD but it too is not for customer consumption. Thanks Joe Orsolini UVa Health System -----Original Message----- From: Watters, Dan To: 'linac-eng@plato1.aristotle.net' Sent: 1/22/01 4:03 PM Subject: Siemens Parts CD-ROM Hi All, Has anyone out there been able to purchase the illustrated parts breakdown CD-ROM from Siemens. I am getting sick of having to look up everything in a computerized list. There are many times when a picture would be most helpful. I realize the Siemens engineers use the intranet now for parts ID. Maybe if we, the customers, lobbied Siemens we could talk them into updating and selling the CD-ROM to us. Any other opinions on this out there in linac land? Thanks, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Parts CD-ROM Message-ID: <6CE096D0CDF4D211A3110008C75D0752360590@XChange.umcaz.edu> From: "Watters, Dan" To: "'linac-eng@plato1.aristotle.net'" Subject: Siemens Parts CD-ROM Date: Mon, 22 Jan 2001 13:03:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi All, Has anyone out there been able to purchase the illustrated parts breakdown CD-ROM from Siemens. I am getting sick of having to look up everything in a computerized list. There are many times when a picture would be most helpful. I realize the Siemens engineers use the intranet now for parts ID. Maybe if we, the customers, lobbied Siemens we could talk them into updating and selling the CD-ROM to us. Any other opinions on this out there in linac land? Thanks, Dan Watters UMC Tucson ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 2100cd beam problems Message-ID: <8e.101a0cae.279dad6f@aol.com> From: JDDIHWRR@aol.com To: linac-eng@plato1.aristotle.net Subject: 2100cd beam problems Date: Mon, 22 Jan 2001 07:36:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have finally decide to break the ice and post a request on the site. I havw a 2100c/d, SN#688, that i have started experiencing a strange anomaly with the 6/9e beams. Reproducibility Vs, gantry angle is changing. on inspection we have determined that the solenoid is in fact locked in place and not moving. We found that the dose rate is changing with gantry location, leading us to think that the dose calibration is changing. We did find we could change the greatest discrepency between gantry angles by adjusting Bun-R/T, and SOLI. As we changed adjustments, and then rotated the gantry the greatest change in dose difference would actually swap to another gantry angle. The largest difference was measured at 4.2%. Varian tolerance is 2% for this test. Our physicist has test data for the years 1998 and 1999 that shows this machine was well below 1%. However in whe he did his annual calibration this year, he found this machine to be 3-4% out of tolerance. Gentlemen, any advice will be greatly appreciated on this problem. I thank you in advance. Jerry D. Dukes BioMed Department Christus-St.Michael Health Care Center Texarkana, Tx. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Medical Technical Officer / Senior Planning Radiographer Vacancy Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: Medical Technical Officer / Senior Planning Radiographer Vacancy Date: Mon, 22 Jan 2001 02:41:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" POOLE HOSPITAL NHS TRUST DORSET CANCER CENTRE RADIOTHERAPY PHYSICS SERVICE Post: Medical Technical Officer / Senior Planning Radiographer Grade: MTO3 / Senior II Radiographer Salary: ,17195 - ,20115 p.a. (or Sen.II scale) Closing Date: 15th February 2001 Come and join the team in a modern Cancer Centre by the beautiful beaches and coastline of Dorset. The Radiotherapy Physics Service at the Dorset Cancer Centre has a vacancy for a Medical Technical Officer (Grade 3), or Senior II Radiographer, to work within the team providing scientific treatment planning of radiation therapy at Poole Hospital. Working as part of the Physics team, this post will contribute to a vital aspect of Health Care provided at Poole for the benefit of patients from the whole of Dorset, whilst enjoying the numerous benefits of an attractive South Coast environment. The Department is currently equipped with 3 linear accelerators, providing photon and electron beams, orthovoltage equipment, low doserate afterloading equipment, and a Simulator with CT facilities. A new accelerator will be installed in 2002 with MLC and electronic portal imaging. Treatment planning uses PLATO computers, with on-site diagnostic CT and MRI. HDR brachytherapy is under consideration. Significant relevant experience will be required for this post, and a relevant degree, HTEC/HNC or equivalent qualification is essential, preferably in Physical Sciences or MPPM, along with accuracy in Maths and good communications skills. Exceptionally, appointment at a lower grade would be considered for a candidate not meeting the full experience or qualification requirements, with opportunities for further training. It may be feasible for a radiographer appointee to maintain clinical skills by rotation within the Radiotherapy Department. We would also welcome enquiries from qualified therapy radiographers with planning experience and wishing to specialise in treatment planning, in which case appointment in a Senior Radiographer grade would be considered. For further details, or to arrange an informal visit, contact Mr. W. A. Heywood on 01202 442306 or e-mail aheywood@poole-tr.swest.nhs.uk For an application form and job description please send an s.a.e. (minimum size 18x25 cm) to Mrs. S. Turner, Recruitment Officer, Personnel Department, Poole Hospital N.H.S.Trust, Longfleet Road, Poole, Dorset. BH15 2JB. Please quote job reference 976 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MTO 4 Vacancy Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: MTO 4 Vacancy Date: Fri, 19 Jan 2001 01:23:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable POOLE HOSPITAL NHS TRUST DORSET CANCER CENTRE Come and join the team in a modern Cancer Centre by the beautiful beaches and coastline of Dorset. We have a vacancy for an experienced Electronics / Electro-mechanical = MTO to provide equipment support to radiotherapy at Poole Hospital, where you = will contribute to a vital aspect of Health Care for patients from the whole = of Dorset, whilst enjoying the numerous benefits of an attractive South = Coast environment. =20 Grade:MTO 4 Salary: =A320919 - =A324473 p.a. Closing Date:15th February 2001=20 Main duties will be in maintenance and quality assurance of a broad = range of radiotherapy equipment, including multi-modal linear accelerators, and = in supporting the electronic, electromechanical or mechanical development services provided within Medical Physics (according to skill & = experience.) For appointment to MTO4, current experience in linear accelerator = servicing and maintenance will be required. Exceptionally, candidates with lesser experience but an appropriate background would be considered for = appointment to a lower grade, and offered opportunities for specific technical = training. For further details, or to arrange an informal visit, contact=20 Tony Heywood on 01202 442306 (e-mail aheywood@poole-tr.swest.nhs.uk)=20 or Brian Whitlock on 01202 448175 (e-mail = bwhitlock@poole-tr.swest.nhs.uk) For an application form and job description please send an s.a.e. = (minimum size 18x25 cm) to=20 Mrs. S. Turner,=20 Recruitment Officer,=20 Personnel Department,=20 Poole Hospital N.H.S.Trust,=20 Longfleet Road,=20 Poole,=20 Dorset.=20 BH15 2JB. =20 Please quote job reference 977. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Medical Physicist Message-ID: From: Robert Wood To: linac-eng@plato1.aristotle.net Subject: Medical Physicist Date: Thu, 18 Jan 2001 12:25:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" My boss requested that I post this on this list. Any views or opinions expressed in this email (unless otherwise stated) are mine and do not reflect the opinions or policies of any other person or organization. This email may contain personel or private information and the foregoing is not intended to be a legally binding or legally effective electronic signature. This message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify me, disregard the foregoing message, and delete the message immediately. 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//////////////////8BAP7/AwoAAP////8GCQIAAAAAAMAAAAAAAABGGAAAAE1pY3Jvc29mdCBX b3JkIERvY3VtZW50AAoAAABNU1dvcmREb2MAEAAAAFdvcmQuRG9jdW1lbnQuOAD0ObJxAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAA== ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 6/100 Message-ID: From: Chris Coyle To: linac-eng@plato1.aristotle.net Subject: Varian 6/100 Date: Wed, 17 Jan 2001 10:42:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Clinac 6/100 # 69 is up for grabs at Overlake Hospital Bellevue, WA Contact Dann Jergenson at 425.688.5568 Chris Coyle Swedish Tumor Inst Seattle, WA. 206.215.3963 chris.coyle@swedish.org ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta SL25 Thyratron CX 1154L problems. Conklusion. Message-ID: <2E2DB450DFB@medfys.aau.dk> From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Cc: ulsq@medfysik.aau.dk Subject: Elekta SL25 Thyratron CX 1154L problems. Conklusion. Date: Wed, 17 Jan 2001 02:27:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, thank you very much for responding to my problems with the thyratron on SL25. I've got 9 responds = 5 suggested "try yet another thyratron" 1 suggested " bad grounding cable" 1 explained the difference between Cx1154 and Cx1154L 1 discussed the function of the modulator 1 suggested "arcing in the modulator" I appreciate all the responds and I noticed that noone apparently had ran into same problems... Nevertheless I borrowed a CX1154 (no L) from a nearby site and installed that. Puf. That cleared the problem. Though it hurts my scientific feelings I don't have the time to get to the bottom of this but my conclusion right now is that CX1154L only can run in our SL15 and CX1154 (no L) in our SL25. Again, thank you all for your attention. Original message : Hi Group, on our Elekta SL25 we have a problem when installing a new thyratron. We can not get it running without what appear to be x-tra firing of the thyratron. Its an awful sound but actually the accelerator is able to deliver the proper dose. (However we will not use such a noisy thyratron so we continue a little further with the old CX1154). Looking at the scope we can see the thyratron is firing irregular and at a faster frequency. Up till now we have tried 2 brand new CX1154L . By playing with the "charge rate" or the "replenish voltage" we are able to run the thyratron stable for 1 or 2 days. But then a new setting is required. In order to find the defective part we have changed the thyratron prepulser board. No success. Unfortunately we don't have any old fashioned CX1154 (no L) so we don't know if its the thyratron or ??? The favourite theory at the moment is a defective "PPG card". Im aware of the "Technical Newsletter" RT 177 from Elekta and our accelerator has no slits anymore. Anyone got any ideas ??? Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: FW: Siemens MLC Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: FW: Siemens MLC Date: Tue, 16 Jan 2001 10:26:26 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - -----Original Message----- From: Liounis, Dave Sent: Tuesday, January 16, 2001 1:25 PM To: 'JMADDOX@LROC.HARVARD.EDU' Cc: Barnes, Bill Subject: RE: Siemens MLC Jerry, Just finished doing speed calibrations with Kathy Gardener from Siemens two weeks ago. The way that seemed to work out the best was to reset all leafs to default so we had had starting point. Next we adjusted the leaves for fast speed. Every leaf's Hex code was written into a excel spread sheet for future reference. We adjusted so all leaf speeds were getting to their slow down point within about 1 sec of each other. Next we adjusted the slow speeds trying to keep all leafs getting to their final destination as fast as possible without having overshoot. Make sure you document hex codes on spreadsheet. after adjustments turn gantry to 90 deg. Check both fast and slow leaf speeds with and against gravity. You may possibly need to touch up some of the speeds. Turn Gantry to 270 deg and check leaf speeds with and against Gravity. Some leaves may need to be adjusted to the point of having some overshoot, I would try to keep this to a minimum If you document your hex codes it help you determine if there is a problem with a leaf by how often you are having to adjust the same leaf. If you have any other questions I would be happy to help you any way I can. I would keep the spread sheets taped to the MLC cabinet for future reference. Dave Liounis Fox Chase Cancer Center Radiation Oncology Engineering 215-728-2997 D_LIOUNIS@FCCC.EDU - -----Original Message----- From: Barnes, Bill Sent: Tuesday, January 16, 2001 11:47 AM To: Liounis, Dave Subject: FW: Siemens MLC - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - - -----Original Message----- From: Maddox, Jerry [mailto:JMADDOX@LROC.HARVARD.EDU] Sent: Saturday, January 13, 2001 10:33 AM To: 'Barnes, Bill' Subject: RE: Siemens MLC Tx for the tips and info. Have you had much experience with the speed calibration? Very time consuming, any tips? We have learned not to power down when the MLC is moving, as a new calibration will be necessary. I have been pleasantly surprised to recieve email direct from Siemens in response to some inquiries. FSE is much more available than other companies. 8255s seem to go occasionally, good item to stock. Also the transistor that controls the 300v in the injector. Recently had the fat +/-15v ps in the interlock chassis die. I stock all the potted power supplies. Hope to get into ordering more of the semiconductors, key switches, etc., even though we are under contract. We have been afraid not to have a full parts contract due to the big ticket items that failed, such as pulse tank, driver, flex guide, target. Very helpful to exhange info on this forum. Jerry > -----Original Message----- > From: Barnes, Bill [SMTP:B_Barnes@FCCC.EDU] > Sent: Thursday, January 11, 2001 6:06 AM > To: Linac-Eng (E-mail) > Subject: Siemens MLC > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hello Everyone, > > First I would like to thank everyone for the great response I > received from my post on the Siemens MLC Downtime stats, overall > the results were good with fairly low downtime and good response > from FSE Support. > > I would like to thank Kathy Gardner of Siemens FSE Support for her > direct support of our MLC problems. We have again received great > support from the FSE Staff at Siemens! > > Also since the purpose of this forum is to share knowledge, so I > would like to tell the other engineers who did not already know > this... > > when calibrating the positional part of the Siemens MLC, it worked > better for us to begin calibration with both MLC banks at +20cm. > Power Off the MLC cabinet. Release the software interlocks at the > MLC cabinet, restore power to cabinet, then drive one bank of the > MLC > beyond the -10cm point and into the mechanical stops. Do the > Encoder initialization at this point, instead of at -10cm. This > seems to > give us a better overall calibration. Then proceed with the rest of > your MLC calibration by moving the bank to > -10cm and start the capture process. Then do the same for the > other bank. > > Also when doing the capture process, always try to capture the data > from a leaf when the leaf has been driven from one direction > consistently... by this I mean move the leaf from the -10 cm point > to the 0cm point and if you overshoot the capture point, then take > the leaf back to the negative side and move it to where you want it > to be. This seemed to help us compensate for the mechanical > backlash. > > I hope this will help someone else as it has helped us... > > v/r > > Billy Barnes B.S.E.T. > Radiation Oncology Engineer > > Fox Chase Cancer Center > 7701 Burholme Ave. > Philadelphia, Pa. 19111 > > 215-728-2997 > 215-728-4789 fax > > B_barnes@fccc.edu > > > -----BEGIN PGP SIGNATURE----- > Version: PGPfreeware 6.5.8 for non-commercial use > > > iQA/AwUBOl2VN6aK70jdHRmKEQL5pgCeOl/6AfP3A+9byr6sRPaXYcGYTl4An0C9 > zQJ8OxuF8lksYBeNe7B7BpPM > =krdk > -----END PGP SIGNATURE----- - -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOmR82aaK70jdHRmKEQLejgCcDTLtAq3DjgH3Ixl4HLc5VfCQD3oAn3N6 iGv0k1J1Awx0iHklNRetrU7t =TxSG - -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOmSUF6aK70jdHRmKEQJlnwCfTIplP7jqyRF0L7ALEZqtAkV7op4Anj9W gaEFa5lbnXYNvyVAPmHmCIdB =V9sZ -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Varian MLC infrared emitters Message-ID: From: graham freestone To: rod.williams@phci.org, linac-eng@plato1.aristotle.net Subject: Re: Varian MLC infrared emitters Date: Sat, 13 Jan 2001 17:00:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Rod & listers, The suppliers of those diodes is Optodiode Corp.; www.optodiode.com >From memory they were approx US$8 each, and there was a minimum purchase of 10? 20? (or $200 worth?). Anyway, a significant saving over buying the PCB, as long as you don't mind buying 10 years worth. Regards Graham Freestone _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: wages Message-ID: From: "Schebler, Joe" To: "'linac-eng@plato1.aristotle.net'" Subject: wages Date: Fri, 12 Jan 2001 13:13:09 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings all, How do I get the results of the recent poll of salaries? Also How many of you in-house/clinic linac engineers have to be on 24 Hr call? What I,m actually after is the average salary of an experienced in-house linac engineer with three or more years of experience. Joe Schebler Univ of Iowa Hospital 319 356-3376 joe-schebler@uiowa.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens MLC Message-ID: <4.1.20010112112153.009c3100@radonc17.ucsf.edu> From: John Somers To: "Barnes, Bill" Cc: "Linac-Eng (E-mail)" Subject: RE: Siemens MLC Date: Fri, 12 Jan 2001 08:26:51 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Bill, yes we have cleaned off that same black stuff from the Siemens MLC leaves. So far as I can tell, it is generated somehow by use of the leaves. We do IMRT all day long and move those leaves a heckuva lot. And we don't put anything on the leaves for lube, as recommended by Siemens. That seems to work OK. John At 01:35 PM 1/12/01 -0500, Barnes, Bill wrote: > >Hello John, > [snip]..... > >I have noticed the Siemens MLC seems to be coated with a dry dark >colored substance that resembles graphite. When I ask the Siemens >reps, they say nothing has been applied for lubrication and they do >not recommend applying any lubricate. Yet when we clean our leafs >with alcohol and lint free materials, this substance is removed. Is >it needed? Should it be reapplied? >Does anyone out there know more on this? What works best on your >Siemens MLC's? > >As we all know this list is monitored by the factory people of most >manufactures, so I am sure Siemens will respond to these questions >quickly. > >Billy Barnes B.S.E.T. >Radiation Oncology Engineer > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Siemens MLC Message-ID: From: "Barnes, Bill" To: 'John Somers' Cc: "Linac-Eng (E-mail)" Subject: RE: Siemens MLC Date: Fri, 12 Jan 2001 10:35:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello John, We accomplished this new method of initializing the encoders (this idea came from Siemens Factory Reps "Kathy Gardner") for the reason of providing an exact point, every time, for the encoders to start counting pulses. It seems to work well for us, so far. As for the backlash of the leafs... we went through all of the leafs on one of our Primus units and adjusted each for optimal balance between backlash and travel... Our results were encouraging. As you said it is difficult to find that point, so make sure you have 5 or 6 hours to kill before you start the procedure. I have received several requests as to time involved with Siemens MLC units vs Varian... I have worked on both and both seem to require a lot of adjusting, cleaning and attention... Honestly I haven't noticed one taking more time or assets over the other one. I have noticed the Siemens MLC seems to be coated with a dry dark colored substance that resembles graphite. When I ask the Siemens reps, they say nothing has been applied for lubrication and they do not recommend applying any lubricate. Yet when we clean our leafs with alcohol and lint free materials, this substance is removed. Is it needed? Should it be reapplied? Does anyone out there know more on this? What works best on your Siemens MLC's? As we all know this list is monitored by the factory people of most manufactures, so I am sure Siemens will respond to these questions quickly. Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - -----Original Message----- From: John Somers [mailto:somers@RadOnc17.UCSF.Edu] Sent: Friday, January 12, 2001 9:39 AM To: Barnes, Bill; Linac-Eng (E-mail) Subject: Re: Siemens MLC Bill and everyone on the list, Your suggestion of initializing the encoders at the mechanical stop is new to me. I would be interested to know what improvement you see in calibration when you do this rather than initializing at -10 cm. As you described, we also capture the other cal points using leaf motion always from the same direction. The mechanical backlash is significant, and involves a compromise between backlash and leaf binding when the leaf drive mechanisms are installed. That compromise varies, depending on who is doing it, which drive is being serviced, how late at night, etc., etc. Thanks for the info. John Somers At 06:05 AM 1/11/01 -0500, Barnes, Bill wrote: > >Hello Everyone, > >First I would like to thank everyone for the great response I >received from my post on the Siemens MLC Downtime stats, overall the >results were good with fairly low downtime and good response from >FSE Support. > >I would like to thank Kathy Gardner of Siemens FSE Support for her >direct support of our MLC problems. We have again received great >support from the FSE Staff at Siemens! > >Also since the purpose of this forum is to share knowledge, so I >would like to tell the other engineers who did not already know >this... > >when calibrating the positional part of the Siemens MLC, it worked >better for us to begin calibration with both MLC banks at +20cm. >Power Off the MLC cabinet. Release the software interlocks at the >MLC cabinet, restore power to cabinet, then drive one bank of the >MLC >beyond the -10cm point and into the mechanical stops. Do the >Encoder initialization at this point, instead of at -10cm. This >seems to >give us a better overall calibration. Then proceed with the rest of >your MLC calibration by moving the bank to > -10cm and start the capture process. Then do the same for the > other >bank. > >Also when doing the capture process, always try to capture the data >from a leaf when the leaf has been driven from one direction >consistently... by this I mean move the leaf from the -10 cm point >to the 0cm point and if you overshoot the capture point, then take >the >leaf back to the negative side and move it to where you want it to >be. This seemed to help us compensate for the mechanical backlash. > >I hope this will help someone else as it has helped us... > >v/r > >Billy Barnes B.S.E.T. >Radiation Oncology Engineer -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOl9PzqaK70jdHRmKEQLLFgCg2AXQINBNgtojpuUST08YKsZhuXMAn00i nrfA7tEjI2O7QZfoVzqZyceS =AsXf -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl2100C Gun Replacement Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "Wilson, Jim" Subject: Re: Cl2100C Gun Replacement Date: Fri, 12 Jan 2001 08:59:42 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Jim, Call me on my cell phone 301-524-6046. -- On Fri, 12 Jan 2001 08:23:05 Wilson, Jim wrote: >Hi Dave!! I have been trying to avoid replacing the gun in our 2100 since we >are getting 2 new ones in about a year but...........I don't think I have a >choice. I can only make 2.2V of gunI and often you see the waveform "tearing >up". Our 6X is grumpy (worse at gantry angles) and I have already gotten as >much out of filament increases (as well as a wee bit of gunHIV increase) as >I can. Anyway, I was wondering if you had any thoughts about how the latest >guns process. I was on vacation last year when Prov Portland had to do a gun >replacement emergently and they couldn't get the gun output up enough. They >finally called in Varian and Sid turned the filaments up to 7-7.5V for a few >hours and that made it work. Is that common now?? Also, I wonder if we >should replace the target at the same time, considering all the leaky >targets I have heard about. VacIon PS also?? Any other comments on gun >replacements would be appreciated, it will be my first time. That seems >amazing to me considering that I have been doing this for 17 years. Stay in >touch and have a great new year!!! Jim > >*************************************************************************** * >This message is intended for the sole use of the individual and entity to >whom it is addressed, and may contain information that is privileged, >confidential and exempt from disclosure under applicable law. If you are >not the intended addressee, nor authorized to receive for the intended >addressee, you are hereby notified that you may not use, copy, disclose or >distribute to anyone the message or any information contained in the >message. If you have received this message in error, please immediately >advise the sender by reply email and delete the message. Thank you very >much. > Get your small business started at Lycos Small Business at http://www.lycos.com/business/mail.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Elekta SL25 Thyratron CX 1154L problems. Message-ID: <3A5F2622.52E3F0FC@yale.edu> From: "Peter E. Vitali" To: Ole@medfys.aau.dk Cc: linac-eng@plato1.aristotle.net Subject: Re: Elekta SL25 Thyratron CX 1154L problems. Date: Fri, 12 Jan 2001 07:44:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ole: If the CX 1154L is a Marconi tube (Old EEV) contact Gary Lewis, Marconi Applied Technologies, Waterhouse Lane, Chelmsford Essex CM1 2QU, United Kingdom. I met him at the ASTRO meeting in the USA in October and he was very knowledgeable about how they work in the various linear accelerators. He may be able to tell you what to do to correct the problem. Tel: +44 (0) 1245 493493 E-mail: gary.lewis@marconi.com Marconi is on the Internet at: www.marconitech.com Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Elekta SL25 Thyratron CX 1154L problems. Message-ID: <26FE7E97FA6@medfys.aau.dk> From: Ole@medfys.aau.dk To: linac-eng@plato1.aristotle.net Subject: Elekta SL25 Thyratron CX 1154L problems. Date: Fri, 12 Jan 2001 07:33:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Group, on our Elekta SL25 we have a problem when installing a new thyratron. We can not get it running without what appear to be x-tra firing of the thyratron. Its an awful sound but actually the accelerator is able to deliver the proper dose. (However we will not use such a noisy thyratron so we continue a little further with the old CX1154). Looking at the scope we can see the thyratron is firing inregular and at a faster frequency. Up till now we have tried 2 brand new CX1154L . By playing with the "charge rate" or the "replenish voltage" we are able to run the thyratron stable for 1 or 2 days. But then a new setting is required. In order to find the defective part we have changed the thyratron prepulser board. No succes. Unfortunately we dont have any old fashioned CX1154 (no L) so we dont know if its the thyratron or ??? The favourite theory at the moment is a defective "PPG card". Im aware of the "Technical Newsletter" RT 177 from Elekta and our accelerator has no slits anymore. Anyone got any ideas ??? Ole G. Nielsen Department of Medical Physics Aarhus University Hospital 8000 Aarhus C Denmark Voice +8949.2487 Fax +8949.2590 email: ole@medfysik.aau.dk ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian MLC infrared emitters Message-ID: <3AE23899EECFD411B2210008C7B2BF399F5058@wmhmail.whs.org> From: "Williams, Rod" To: "'linac-eng@plato1.aristotle.net'" Subject: Varian MLC infrared emitters Date: Fri, 12 Jan 2001 04:46:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello to all, I am looking for a source for the emitter used on the 120 MLC emitter board, it has a part number on it of OD-880-F1, any help would be appreciated. Thanks Rod Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: MTO4 Vacancy at Poole Hospital Message-ID: From: Brian Whitlock To: linac-eng@plato1.aristotle.net Subject: MTO4 Vacancy at Poole Hospital Date: Fri, 12 Jan 2001 02:52:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable POOLE HOSPITAL NHS TRUST DORSET CANCER CENTRE Come and join the team in a modern Cancer Centre by the beautiful beaches and coastline of Dorset ? We have a vacancy for an experienced Electronics / Electro-mechanical = MTO to provide equipment support to radiotherapy at Poole Hospital, where you = will contribute to a vital aspect of Health Care for patients from the whole = of Dorset, whilst enjoying the numerous benefits of an attractive South = Coast environment.=09 Grade:MTO 4 Salary: =A320919 - =A324473 p.a. Closing Date:15th February 2001=20 Main duties will be in maintenance and quality assurance of a broad = range of radiotherapy equipment, including multi-modal linear accelerators, and = in supporting the electronic, electromechanical or mechanical development services provided within Medical Physics (according to skill & = experience.) For appointment to MTO4, current experience in linear accelerator = servicing and maintenance will be required. Exceptionally, candidates with lesser experience but an appropriate background would be considered for = appointment to a lower grade, and offered opportunities for specific technical = training. For further details, or to arrange an informal visit, contact=20 Tony Heywood on 01202 442306 (e-mail aheywood@poole-tr.swest.nhs.uk)=20 or Brian Whitlock on 01202 448175 (e-mail = bwhitlock@poole-tr.swest.nhs.uk) For an application form and job description please send an s.a.e. = (minimum size 18x25 cm) to=20 Mrs. S. Turner,=20 Recruitment Officer,=20 Personnel Department,=20 Poole Hospital N.H.S.Trust,=20 Longfleet Road,=20 Poole,=20 Dorset.=20 BH15 2JB. =20 Please quote job reference 977. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Info Message-ID: <81E5F727841DD211A5FD0008C728DB7B02E618A8@campusx1.tue.nl> From: "Franken, Y." To: linac-eng@plato1.aristotle.net Subject: Info Date: Thu, 11 Jan 2001 08:11:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, I spotted this mail adress. Is it a LINAC-listserver ? Greetings, Yuri Franken Eindhoven University of Technology ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Faculty positions Message-ID: <979232713017681@caramail.com> From: Damien Delon To: nucmed@irus.rri.on.ca, egs4-L@mailbox.slac.stanford.edu, MEDPHYS@cwis-20.wayne.edu, Dose-net@orau.gov, radiobiology@mailbase.ac.uk, radsafe@romulus.ehs.uiuc.edu, bnct@mitvma.mit.edu, RADSCI-L@western.tec.wi.us, mpehta-list@leeds.ac.uk, linac-eng@plato1.aristotle.net Subject: Faculty positions Date: Thu, 11 Jan 2001 08:08:37 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi folks, I would like to draw your attention to open Faculty positions at the department of Physics, EPFL in Lausanne. Please note that applications should be sent before 15 January 2001 = (see the following link). http://dpwww.epfl.ch/Physique.pdf Regards, AE http://dpwww.epfl.ch/ ______________________________________________________ Bo=EEte aux lettres - Caramail - http://www.caramail.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "'Barnes, Bill '" , "''CJ.de.Bruijne@walcheren.ziekenhuis.nl' '" , "Maddox, Jerry" Cc: "'Linac-Eng (E-mail) '" Subject: RE: Cl.2100 Crowbar trouble Date: Thu, 11 Jan 2001 07:48:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, IAW CTB-092, the fuse should be 1A, 250V, slo blo. Varian part number: 67-135410-00. Regards, David Hall -- On Wed, 10 Jan 2001 11:42:36 Maddox, Jerry wrote: > The mod was a fuse, and definitely should be done. It is embarrassing to >evacuate the hospital due to the smoke from these coils. Haven't seen this >happen lately, does it still? > >-----Original Message----- >From: Barnes, Bill >To: 'CJ.de.Bruijne@walcheren.ziekenhuis.nl' >Cc: Linac-Eng (E-mail) >Sent: 1/10/01 6:46 AM >Subject: RE: Cl.2100 Crowbar trouble > >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >I have also experienced a lot of problems with the coils of the >Crowbar overheating to the point of smoking/flames. I think Varian >came out with a mod to fix this? But a redesign should also consider >this. >The micro switches fail frequently as well. > > >Billy Barnes B.S.E.T. >Radiation Oncology Engineer > >Fox Chase Cancer Center >7701 Burholme Ave. >Philadelphia, Pa. 19111 > >215-728-2997 >215-728-4789 fax > >B_barnes@fccc.edu > > >- -----Original Message----- >From: CJ.de.Bruijne@walcheren.ziekenhuis.nl >[mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] >Sent: Wednesday, January 10, 2001 1:57 AM >To: hall.david@lycos.com >Cc: linac-eng@plato1.aristotle.net >Subject: RE: Cl.2100 Crowbar trouble > > >Hello David, > >A change in manufacturing is exactly the idea I have about it. >We compared the broken item with an older one and saw that >at least the way the contact blade was fixed to the house had >changed. Maybe the problem occures with items in a certain >manufacturing-range? >This should not happen with a (Varian-price) $2000,- part >I think. > >Regards, Keesjan > >> -----Original Message----- >> From: david hall [SMTP:hall.david@lycos.com] >> Sent: Tuesday, January 09, 2001 4:13 PM >> To: CJ.de.Bruijne@walcheren.ziekenhuis.nl >> Subject: Re: Cl.2100 Crowbar trouble >> >> Hello, >> >> I have seen that happen several times in the recent past, must be a >> change in the manufacturing process, because it never happened to >> me prior to ~1.5 years ago. >> >> Regards, >> >> David Hall >> -- >> >> On Tue, 9 Jan 2001 12:54:24 >> CJ.de.Bruijne wrote: >> >Hi colleagues, >> > >> >In december we were called because of loud noises in the gantry. >> >We discovered the contact blade of the crowbar was travelling >> >trough the gun when turning the gantry. >> >Might have given large sparks! >> > >> >Our question to you: >> >Has such a thing ever happened in your department? >> > >> >The crowbar was delivered okt. 1997 and placed march 2000 >> >The screw that fastens the contact blade had spontaneous >> >come loose within 9 months! >> > >> >Happy troublehunting, >> >Keesjan de Bruijne >> >Ziekenhuis Walcheren >> >Vlissingen, the Netherlands >> >afd. DIA >> >cj.de.bruijne@walcheren.ziekenhuis.nl >> > >> > >> >> >> Get FREE Email/Voicemail with 15MB at Lycos Communications at >> http://comm.lycos.com > >-----BEGIN PGP SIGNATURE----- >Version: PGPfreeware 6.5.8 for non-commercial use > >iQA/AwUBOlxNP6aK70jdHRmKEQITEACeMDNPXfhZI1i4fk2YKyiIDsgzqt0An3Mp >WKiqQzhrXKvilhMbYrsjE5DP >=J49b >-----END PGP SIGNATURE----- > Get your small business started at Lycos Small Business at http://www.lycos.com/business/mail.html ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Crowbar trouble Message-ID: From: "Barnes, Bill" To: "'Carl \"Randy\" La Foone'" Cc: "Linac-Eng (E-mail)" Subject: RE: Crowbar trouble Date: Thu, 11 Jan 2001 03:08:41 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I agree with Randy, the crowbar is a definite "Must Have" spare item. Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - - -----Original Message----- From: Carl "Randy" La Foone [mailto:randy@radparts.com] Sent: Wednesday, January 10, 2001 9:14 PM To: linac-eng@plato1.aristotle.net Subject: RE: Crowbar trouble List members, Regardless whether the CTB (fuse and holder)is installed or not, the big concern is the crowbar is still bad and needs to be replaced. It's well worth the expense to have one in spares to prevent the 2 hours of downtime. Another telltale sign of your crowbar going bad before it actually does is "chatter" or intermittent lose of Gun HV (i.e. no output). Our Regards to the list (once more), Randy, Dee & Jeff The Radparts Guys - -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOl2VrKaK70jdHRmKEQKctwCgqK5bLlRUw9m4hrAXP7bIBWV/mFYAnjVi dob4pA/b3zRZWy4d3cbJuixR =gbDE - -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOl2V6aaK70jdHRmKEQIGdQCZAc8bDVBTxtrC4YGO6APAlHU1tQIAn2SJ pKGYbojrm0XvWryz3O+uCXjs =kWAb -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens MLC Message-ID: From: "Barnes, Bill" To: "Linac-Eng (E-mail)" Subject: Siemens MLC Date: Thu, 11 Jan 2001 03:05:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Everyone, First I would like to thank everyone for the great response I received from my post on the Siemens MLC Downtime stats, overall the results were good with fairly low downtime and good response from FSE Support. I would like to thank Kathy Gardner of Siemens FSE Support for her direct support of our MLC problems. We have again received great support from the FSE Staff at Siemens! Also since the purpose of this forum is to share knowledge, so I would like to tell the other engineers who did not already know this... when calibrating the positional part of the Siemens MLC, it worked better for us to begin calibration with both MLC banks at +20cm. Power Off the MLC cabinet. Release the software interlocks at the MLC cabinet, restore power to cabinet, then drive one bank of the MLC beyond the -10cm point and into the mechanical stops. Do the Encoder initialization at this point, instead of at -10cm. This seems to give us a better overall calibration. Then proceed with the rest of your MLC calibration by moving the bank to -10cm and start the capture process. Then do the same for the other bank. Also when doing the capture process, always try to capture the data from a leaf when the leaf has been driven from one direction consistently... by this I mean move the leaf from the -10 cm point to the 0cm point and if you overshoot the capture point, then take the leaf back to the negative side and move it to where you want it to be. This seemed to help us compensate for the mechanical backlash. I hope this will help someone else as it has helped us... v/r Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOl2VN6aK70jdHRmKEQL5pgCeOl/6AfP3A+9byr6sRPaXYcGYTl4An0C9 zQJ8OxuF8lksYBeNe7B7BpPM =krdk -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Crowbar trouble Message-ID: From: "Carl \"Randy\" La Foone" To: linac-eng@plato1.aristotle.net Subject: RE: Crowbar trouble Date: Wed, 10 Jan 2001 18:14:01 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" List members, Regardless whether the CTB (fuse and holder)is installed or not, the big concern is the crowbar is still bad and needs to be replaced. It's well worth the expense to have one in spares to prevent the 2 hours of downtime. Another telltale sign of your crowbar going bad before it actually does is "chatter" or intermittent lose of Gun HV (i.e. no output). Our Regards to the list (once more), Randy, Dee & Jeff The Radparts Guys ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: From: Craig Pearce To: "'lenj@CancerBoard.ab.ca'" Cc: 'linac eng' Subject: RE: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 13:00:07 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Look in CTB092 http://www.varian.com/onc/shared/pdf/CTB092A.PDF Craig Pearce > -----Original Message----- > From: Leonard C. Johnson [SMTP:lenj@CancerBoard.ab.ca] > Sent: Thursday, 11 January 2001 07:36 > To: John Somers > Cc: B_Barnes@FCCC.EDU; CJ.de.Bruijne@walcheren.ziekenhuis.nl; > linac-eng@plato1.aristotle.net; peter.vitali@yale.edu; > JMADDOX@LROC.HARVARD.EDU > Subject: Re: Cl.2100 Crowbar trouble > > John; > I installed a 0.5Amp. slow-blow fuse in between TB1-4 and > S1A N.O. contact. This fuse is installed into a fuse holder > (F4) mounted on the front panel of the gun deck. This added > fuse protects the interlock switches, lamps, blower, and > the crowbar. > Len > > On Wed, 10 Jan 2001 09:56:44 -0500 John Somers > wrote: > > > Can anyone tell us the fuse type and rating? I just replaced a smoking > > crowbar on our 2100C last week. This fuse is definitely worth > installing. > > > > John Somers > > > > > > At 11:57 AM 1/10/01 -0500, Peter E. Vitali wrote: > > >It still happens. During December we lost a crow bar this > > way. Had the fire >department in. Problem is a lot of > > these Modifications aren't given to sites >that have Varian > > Machines but no service contracts. Did not find > > any reference > > >to it in Customer Technical Bulletins. > > > >Pete Vitali > > > > > > > > > ---------------------- > Leonard C. Johnson > lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Crowbar trouble Message-ID: <000b01c07b3d$2c6657a0$14eafea9@dad> From: Parts To: CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Crowbar trouble Date: Wed, 10 Jan 2001 11:40:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear CJ, RadParts.com carries the HV crowbar relay's in stock for a fraction of the cost you mentioned and at a lower cost than any other supplier - we also carry the fuse holders & fuses if you need them. Our Regards to the list, Randy, Dee & Jeff The RadParts Guys You can search and order via our secure server/online database at www.radparts.com or contact us Toll Free: 877-704-3838 for 24/7 Emergency Parts Support, or via fax at: 847-735-8331. Email us at parts@radparts.com We accept credit cards, echecks, wire tranfers and purchase orders. We guarantee your satisfaction & the lowest possible price. Subj: RE: Cl.2100 Crowbar trouble Date: 01/10/2001 1:03:21 AM Central Standard Time From: CJ.de.Bruijne@walcheren.ziekenhuis.nl Sender: owner-linac-eng@plato1.aristotle.net To: hall.david@lycos.com CC: linac-eng@plato1.aristotle.net Hello David, A change in manufacturing is exactly the idea I have about it. We compared the broken item with an older one and saw that at least the way the contact blade was fixed to the house had changed. Maybe the problem occures with items in a certain manufacturing-range? This should not happen with a (Varian-price) $2000,- part I think. Regards, Keesjan > -----Original Message----- > From: david hall [SMTP:hall.david@lycos.com] > Sent: Tuesday, January 09, 2001 4:13 PM > To: CJ.de.Bruijne@walcheren.ziekenhuis.nl > Subject: Re: Cl.2100 Crowbar trouble > > Hello, > > I have seen that happen several times in the recent past, must be a change > in the manufacturing process, because it never happened to me prior to > ~1.5 years ago. > > Regards, > > David Hall > -- > > On Tue, 9 Jan 2001 12:54:24 > CJ.de.Bruijne wrote: > >Hi colleagues, > > > >In december we were called because of loud noises in the gantry. > >We discovered the contact blade of the crowbar was travelling > >trough the gun when turning the gantry. > >Might have given large sparks! > > > >Our question to you: > >Has such a thing ever happened in your department? > > > >The crowbar was delivered okt. 1997 and placed march 2000 > >The screw that fastens the contact blade had spontaneous > >come loose within 9 months! > > > >Happy troublehunting, > >Keesjan de Bruijne > >Ziekenhuis Walcheren > >Vlissingen, the Netherlands > >afd. DIA > >cj.de.bruijne@walcheren.ziekenhuis.nl > > > > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: <4.1.20010110120552.009ab4b0@radonc17.ucsf.edu> From: John Somers To: lenj@CancerBoard.ab.ca Cc: linac-eng@plato1.aristotle.net Subject: Re: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 09:08:47 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Thanks a lot Len, this is really a help. Smoke in the vaults is pretty ugly, especially when it also smells like burning plastic. John At 11:36 AM 1/10/01 -0700, Leonard C. Johnson wrote: >John; >I installed a 0.5Amp. slow-blow fuse in between TB1-4 and >S1A N.O. contact. This fuse is installed into a fuse holder >(F4) mounted on the front panel of the gun deck. This added >fuse protects the interlock switches, lamps, blower, and >the crowbar. >Len > >On Wed, 10 Jan 2001 09:56:44 -0500 John Somers > wrote: > >> Can anyone tell us the fuse type and rating? I just replaced a smoking >> crowbar on our 2100C last week. This fuse is definitely worth installing. >> >> John Somers >> ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: From: "Leonard C. Johnson" Reply-To: lenj@CancerBoard.ab.ca To: John Somers Cc: B_Barnes@FCCC.EDU, CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net, peter.vitali@yale.edu, JMADDOX@LROC.HARVARD.EDU Subject: Re: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 10:36:21 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" John; I installed a 0.5Amp. slow-blow fuse in between TB1-4 and S1A N.O. contact. This fuse is installed into a fuse holder (F4) mounted on the front panel of the gun deck. This added fuse protects the interlock switches, lamps, blower, and the crowbar. Len On Wed, 10 Jan 2001 09:56:44 -0500 John Somers wrote: > Can anyone tell us the fuse type and rating? I just replaced a smoking > crowbar on our 2100C last week. This fuse is definitely worth installing. > > John Somers > > > At 11:57 AM 1/10/01 -0500, Peter E. Vitali wrote: > >It still happens. During December we lost a crow bar this > way. Had the fire >department in. Problem is a lot of > these Modifications aren't given to sites >that have Varian > Machines but no service contracts. Did not find > any reference > >to it in Customer Technical Bulletins. > > >Pete Vitali > > > > > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: <4.1.20010110095241.0096bf00@radonc17.ucsf.edu> From: John Somers To: peter.vitali@yale.edu, JMADDOX@LROC.HARVARD.EDU Cc: B_Barnes@FCCC.EDU, CJ.de.Bruijne@walcheren.ziekenhuis.nl, linac-eng@plato1.aristotle.net Subject: Re: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 06:56:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Can anyone tell us the fuse type and rating? I just replaced a smoking crowbar on our 2100C last week. This fuse is definitely worth installing. John Somers At 11:57 AM 1/10/01 -0500, Peter E. Vitali wrote: >It still happens. During December we lost a crow bar this way. Had the fire >department in. Problem is a lot of these Modifications aren't given to sites >that have Varian Machines but no service contracts. Did not find any reference >to it in Customer Technical Bulletins. > >Pete Vitali > > > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: <3A5C9421.257ADEF5@yale.edu> From: "Peter E. Vitali" To: "Maddox, Jerry" Cc: "'Barnes, Bill '" , "''CJ.de.Bruijne@walcheren.ziekenhuis.nl' '" , "'Linac-Eng (E-mail) '" Subject: Re: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 08:57:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" It still happens. During December we lost a crow bar this way. Had the fire department in. Problem is a lot of these Modifications aren't given to sites that have Varian Machines but no service contracts. Did not find any reference to it in Customer Technical Bulletins. Pete Vitali ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: <36298D09ED1AD311B4DC0008C7F4D4E103DFF940@phsexch6.partners.org> From: "Maddox, Jerry" To: "'Barnes, Bill '" , "''CJ.de.Bruijne@walcheren.ziekenhuis.nl' '" Cc: "'Linac-Eng (E-mail) '" Subject: RE: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 08:42:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" The mod was a fuse, and definitely should be done. It is embarrassing to evacuate the hospital due to the smoke from these coils. Haven't seen this happen lately, does it still? -----Original Message----- From: Barnes, Bill To: 'CJ.de.Bruijne@walcheren.ziekenhuis.nl' Cc: Linac-Eng (E-mail) Sent: 1/10/01 6:46 AM Subject: RE: Cl.2100 Crowbar trouble -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have also experienced a lot of problems with the coils of the Crowbar overheating to the point of smoking/flames. I think Varian came out with a mod to fix this? But a redesign should also consider this. The micro switches fail frequently as well. Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl [mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] Sent: Wednesday, January 10, 2001 1:57 AM To: hall.david@lycos.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Cl.2100 Crowbar trouble Hello David, A change in manufacturing is exactly the idea I have about it. We compared the broken item with an older one and saw that at least the way the contact blade was fixed to the house had changed. Maybe the problem occures with items in a certain manufacturing-range? This should not happen with a (Varian-price) $2000,- part I think. Regards, Keesjan > -----Original Message----- > From: david hall [SMTP:hall.david@lycos.com] > Sent: Tuesday, January 09, 2001 4:13 PM > To: CJ.de.Bruijne@walcheren.ziekenhuis.nl > Subject: Re: Cl.2100 Crowbar trouble > > Hello, > > I have seen that happen several times in the recent past, must be a > change in the manufacturing process, because it never happened to > me prior to ~1.5 years ago. > > Regards, > > David Hall > -- > > On Tue, 9 Jan 2001 12:54:24 > CJ.de.Bruijne wrote: > >Hi colleagues, > > > >In december we were called because of loud noises in the gantry. > >We discovered the contact blade of the crowbar was travelling > >trough the gun when turning the gantry. > >Might have given large sparks! > > > >Our question to you: > >Has such a thing ever happened in your department? > > > >The crowbar was delivered okt. 1997 and placed march 2000 > >The screw that fastens the contact blade had spontaneous > >come loose within 9 months! > > > >Happy troublehunting, > >Keesjan de Bruijne > >Ziekenhuis Walcheren > >Vlissingen, the Netherlands > >afd. DIA > >cj.de.bruijne@walcheren.ziekenhuis.nl > > > > > > > Get FREE Email/Voicemail with 15MB at Lycos Communications at > http://comm.lycos.com -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOlxNP6aK70jdHRmKEQITEACeMDNPXfhZI1i4fk2YKyiIDsgzqt0An3Mp WKiqQzhrXKvilhMbYrsjE5DP =J49b -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "'CJ.de.Bruijne@walcheren.ziekenhuis.nl'" , "Barnes, Bill" Cc: "Linac-Eng (E-mail)" Subject: RE: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 06:37:44 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Bill, Varian's crowbar mod is to install a fuse in series with the coil. Regards, David Hall -- On Wed, 10 Jan 2001 06:46:27 Barnes, Bill wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >I have also experienced a lot of problems with the coils of the >Crowbar overheating to the point of smoking/flames. I think Varian >came out with a mod to fix this? But a redesign should also consider >this. >The micro switches fail frequently as well. > > >Billy Barnes B.S.E.T. >Radiation Oncology Engineer > >Fox Chase Cancer Center >7701 Burholme Ave. >Philadelphia, Pa. 19111 > >215-728-2997 >215-728-4789 fax > >B_barnes@fccc.edu > > >- -----Original Message----- >From: CJ.de.Bruijne@walcheren.ziekenhuis.nl >[mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] >Sent: Wednesday, January 10, 2001 1:57 AM >To: hall.david@lycos.com >Cc: linac-eng@plato1.aristotle.net >Subject: RE: Cl.2100 Crowbar trouble > > >Hello David, > >A change in manufacturing is exactly the idea I have about it. >We compared the broken item with an older one and saw that >at least the way the contact blade was fixed to the house had >changed. Maybe the problem occures with items in a certain >manufacturing-range? >This should not happen with a (Varian-price) $2000,- part >I think. > >Regards, Keesjan > >> -----Original Message----- >> From: david hall [SMTP:hall.david@lycos.com] >> Sent: Tuesday, January 09, 2001 4:13 PM >> To: CJ.de.Bruijne@walcheren.ziekenhuis.nl >> Subject: Re: Cl.2100 Crowbar trouble >> >> Hello, >> >> I have seen that happen several times in the recent past, must be a >> change in the manufacturing process, because it never happened to >> me prior to ~1.5 years ago. >> >> Regards, >> >> David Hall >> -- >> >> On Tue, 9 Jan 2001 12:54:24 >> CJ.de.Bruijne wrote: >> >Hi colleagues, >> > >> >In december we were called because of loud noises in the gantry. >> >We discovered the contact blade of the crowbar was travelling >> >trough the gun when turning the gantry. >> >Might have given large sparks! >> > >> >Our question to you: >> >Has such a thing ever happened in your department? >> > >> >The crowbar was delivered okt. 1997 and placed march 2000 >> >The screw that fastens the contact blade had spontaneous >> >come loose within 9 months! >> > >> >Happy troublehunting, >> >Keesjan de Bruijne >> >Ziekenhuis Walcheren >> >Vlissingen, the Netherlands >> >afd. DIA >> >cj.de.bruijne@walcheren.ziekenhuis.nl >> > >> > >> >> >> Get FREE Email/Voicemail with 15MB at Lycos Communications at >> http://comm.lycos.com > >-----BEGIN PGP SIGNATURE----- >Version: PGPfreeware 6.5.8 for non-commercial use > >iQA/AwUBOlxNP6aK70jdHRmKEQITEACeMDNPXfhZI1i4fk2YKyiIDsgzqt0An3Mp >WKiqQzhrXKvilhMbYrsjE5DP >=J49b >-----END PGP SIGNATURE----- > Get FREE Email/Voicemail with 15MB at Lycos Communications at http://comm.lycos.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: From: "Barnes, Bill" To: "'CJ.de.Bruijne@walcheren.ziekenhuis.nl'" Cc: "Linac-Eng (E-mail)" Subject: RE: Cl.2100 Crowbar trouble Date: Wed, 10 Jan 2001 03:46:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have also experienced a lot of problems with the coils of the Crowbar overheating to the point of smoking/flames. I think Varian came out with a mod to fix this? But a redesign should also consider this. The micro switches fail frequently as well. Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl [mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl] Sent: Wednesday, January 10, 2001 1:57 AM To: hall.david@lycos.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Cl.2100 Crowbar trouble Hello David, A change in manufacturing is exactly the idea I have about it. We compared the broken item with an older one and saw that at least the way the contact blade was fixed to the house had changed. Maybe the problem occures with items in a certain manufacturing-range? This should not happen with a (Varian-price) $2000,- part I think. Regards, Keesjan > -----Original Message----- > From: david hall [SMTP:hall.david@lycos.com] > Sent: Tuesday, January 09, 2001 4:13 PM > To: CJ.de.Bruijne@walcheren.ziekenhuis.nl > Subject: Re: Cl.2100 Crowbar trouble > > Hello, > > I have seen that happen several times in the recent past, must be a > change in the manufacturing process, because it never happened to > me prior to ~1.5 years ago. > > Regards, > > David Hall > -- > > On Tue, 9 Jan 2001 12:54:24 > CJ.de.Bruijne wrote: > >Hi colleagues, > > > >In december we were called because of loud noises in the gantry. > >We discovered the contact blade of the crowbar was travelling > >trough the gun when turning the gantry. > >Might have given large sparks! > > > >Our question to you: > >Has such a thing ever happened in your department? > > > >The crowbar was delivered okt. 1997 and placed march 2000 > >The screw that fastens the contact blade had spontaneous > >come loose within 9 months! > > > >Happy troublehunting, > >Keesjan de Bruijne > >Ziekenhuis Walcheren > >Vlissingen, the Netherlands > >afd. DIA > >cj.de.bruijne@walcheren.ziekenhuis.nl > > > > > > > Get FREE Email/Voicemail with 15MB at Lycos Communications at > http://comm.lycos.com -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOlxNP6aK70jdHRmKEQITEACeMDNPXfhZI1i4fk2YKyiIDsgzqt0An3Mp WKiqQzhrXKvilhMbYrsjE5DP =J49b -----END PGP SIGNATURE----- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemmens Message-ID: <3.0.6.32.20010110120736.007e3db0@rambam.health.gov.il> From: "Dr. Raquel Bar-Deroma" To: linac-eng@plato1.aristotle.net Subject: Siemmens Date: Wed, 10 Jan 2001 02:07:36 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi, Our department will purchase a new linac in the near future. Today we have 3 linacs all Varian. We,the physicists, are checking other manufacturers specially Siemens. For some reason in your list there is a prevalence of Varian equipment, I mean comments, complaints, problems , etc.. Can somebody comment on: 1 - having linacs of 2 different manufacturers in the same clinic, 2 - comments on Siemens new linacs. I would like to receive the answers directly to my e-mail address below. Thank you. Raquel Bar-Deroma, D.Sc. Phone: +972 4 854 3153 Chief Physicist Fax: +972 4 854 2929 Dept. of Oncololy e-mail: r_bar_daroma@rambam.health.gov.il Rambam Medical Center POBox 9602, Haifa 31096,Israel ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: Cl.2100 Crowbar trouble Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: hall.david@lycos.com Cc: linac-eng@plato1.aristotle.net Subject: RE: Cl.2100 Crowbar trouble Date: Tue, 9 Jan 2001 22:56:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello David, A change in manufacturing is exactly the idea I have about it. We compared the broken item with an older one and saw that at least the way the contact blade was fixed to the house had changed. Maybe the problem occures with items in a certain manufacturing-range? This should not happen with a (Varian-price) $2000,- part I think. Regards, Keesjan > -----Original Message----- > From: david hall [SMTP:hall.david@lycos.com] > Sent: Tuesday, January 09, 2001 4:13 PM > To: CJ.de.Bruijne@walcheren.ziekenhuis.nl > Subject: Re: Cl.2100 Crowbar trouble > > Hello, > > I have seen that happen several times in the recent past, must be a change > in the manufacturing process, because it never happened to me prior to > ~1.5 years ago. > > Regards, > > David Hall > -- > > On Tue, 9 Jan 2001 12:54:24 > CJ.de.Bruijne wrote: > >Hi colleagues, > > > >In december we were called because of loud noises in the gantry. > >We discovered the contact blade of the crowbar was travelling > >trough the gun when turning the gantry. > >Might have given large sparks! > > > >Our question to you: > >Has such a thing ever happened in your department? > > > >The crowbar was delivered okt. 1997 and placed march 2000 > >The screw that fastens the contact blade had spontaneous > >come loose within 9 months! > > > >Happy troublehunting, > >Keesjan de Bruijne > >Ziekenhuis Walcheren > >Vlissingen, the Netherlands > >afd. DIA > >cj.de.bruijne@walcheren.ziekenhuis.nl > > > > > > > Get FREE Email/Voicemail with 15MB at Lycos Communications at > http://comm.lycos.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Untitled Message-ID: <862569CF.008268A2.00@utm-notes-m2.mdacc.tmc.edu> From: twaldron@mail.mdanderson.org To: linac-eng@plato1.aristotle.net Subject: Date: Tue, 9 Jan 2001 15:34:19 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: multipart/mixed; boundary="----_=_NextPart_002_01C19968.260B5550" ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; charset="iso-8859-1" Dear Colleagues, I hope your holidays were restful and joyous and that you welcome the new year with good health and a positive outlook. Many of you are aware of efforts during the past year to organize our profession. I am happy to report that this effort is alive and well, progressing and enjoying the on-going full support of the AAPM. ****** July 2000 Meeting ******** As was announced last year in this forum, a meeting was held in conjunction with the AAPM annual meeting (and World Congress on Biomedical Engineering) in Chicago during July of 2000. Our group was hosted by the AAPM Ad Hoc Committee to Assist in Formation of a Professional Organization for Accelerator Service Personnel, chaired by James Galvin, Ph.D. This committee is a group of interested physicists and industry professionals with a common belief that such a group is a necessary step forward from the status quo as well as beneficial to Radiation Oncology and Medical Physics. The meeting was moderated by Dr. Galvin, and consisted of a number of expert speakers and seminars on topics involved in functions, structure, member services and the process of creating a professional organization. The 50+ accelerator service engineers attending the 1.5 day meeting also held open discussions on what form our organization might take, vote on a name, and group into committees to distribute the work necessary to create this association. Rather than going into great detail on this part, I've appended the minutes of the meeting to this posting. The name of our group is the be the RADIOTHERAPY SERVICE ENGINEERS ASSOCIATION (RSEA). The organization as such does not legally exist until we form a non-profit corporation, which is the current task at hand. -So we do not yet have formal officers, membership definitions, dues, etc. There is much to be done. We do, however, currently enjoy the strong fiscal, moral and leadership support of the AAPM, and the commitment of sufficient individuals that we shall succeed in this endeavor. We have organized into four main committees: 1. FORMATION COMMITTEE, chaired by myself. 2. EDUCATION COMMITTEE, chaired by John Somers. 3. MEMBERSHIP COMMITTEE, chaired by Larry Crowley 4. COMMUNICATIONS COMMITTEE, chaired by Richard Whitham. ***** RSEA Incorporation ****** Since our July meeting, the Bylaws subcommittee of the Formation committee has met via conference call to establish legal representation through the AAPM's legal counsel and set a timetable for finalization of bylaws, articles of incorporation and statement of goals; all of which are necessary to enter existence from a legal and tax perspective. We will meet again electronically in January and in person in March with the goal of attaining incorporation/tax status by summer 2001. ******* Acknowledgments ****** I wish to take this opportunity to express our thanks to the AAPM for supporting this effort. The July meeting was made real only through the effort and support of AAPM President Ken Hogstrom and the Ad Hoc committee. I have also received numerous expressions of support from the OEMs and a number of vendors and service providers within the Radiotherapy realm. In the future I intend to provide updates on our progress at bimonthly intervals. If you have questions about our status or any aspect of RSEA, feel free to email or call me. I will be happy to fill you in. Thanks. Tim Waldron Chairman, RSEA Formation Committee (713) 792-3235 twaldron@mdanderson.org Minutes of the July meeting follow... MINUTES OF THE FIRST MEETING OF THE RADIOTHERAPY SERVICE ENGINEERS ASSOCIATION July 22 and 23, 2000 Sheraton Chicago Hotel and Towers Chicago, Illinois INDIVIDUALS PRESENT: See Attachment A WELCOMING REMARKS: Kenneth Hogstrom, President of the American Association of Physicists in Medicine (AAPM), welcomed the attendees to this meeting aimed at discussing the creation of a society to represent individuals involved in the maintenance of the equipment used for radiation therapy. Hogstrom pointed out that the AAPM had become aware of an interest in the formation of such a group, and that he had established a presidential Ad Hoc Committee within the AAPM to provide assistance with this process. He said that the idea was for the AAPM to use the resources of a mature organization to help this effort to move forward as quickly and efficiently as possible. Hogstrom ------_=_NextPart_002_01C19968.260B5550 Content-Type: text/plain; name="ATT26697.txt" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="ATT26697.txt" ?s remarks are included at the end of these minutes to these minutes (see Attachment B). INTRODUCTION: James Galvin, as the Chair of the AAPM Ad Hoc = Committee, started the didactic portion of the meeting with some introductory remarks. = Galvin said that the AAPM Ad Hoc Committee had organized a program for the next = two days (See Attachment C). The initial part of the program was designed = to provide information about how the AAPM was organized to fulfill its purpose = as a group representing medical physicists. Galvin pointed out that the = purpose of this portion of the program was to help provide a framework that the = founding members of a new society for accelerator maintenance engineers could use as a = template. DIDACTIC TALKS: Salvatore Trofi, Executive Director of the AAPM, spoke = about the organization of the AAPM Headquarters to give the attendees an idea of = how a new society might be structured. He also discussed the resources = available within the AAPM that might prove helpful to those undertaking the formation of = this new society. Donald Frey discussed the educational component of the AAPM?s = activities, and Robert Rice talked about the Job Placement Service run by the AAPM. In = order to understand the process of incorporating a non-prophet society, Edward = Sternick was asked to talk about the steps involved in forming a corporation. A = total of four hours was devoted to this portion of the meeting. DISCUSSION SESSIONS: The remainder of the time allotted for the meeting = was used for brainstorming sessions aimed ar starting the process of = structuring the society. The first topic discussed was the selection of a name = for the new group. After considerable debate and discussion, the name = RADIOTHERAPY SERVICE ENGINEERS ASSOCIATION (RSEA) was selected. A request for volunteers for the different committees needed to move = the process forward was made. The major committee established at this = time was the Formation Committee. This committee separated into three = subcommittees: By-Laws, Statement of Purpose, and Finance. The Formation Committee = selected Tinothy Waldron as Chair and Jim Beaty as Vice Chair. An Education = Committee was also formed. The names of the individuals volunteering for these = committees are attached. The Formation Committee agreed to start on the process of drafting = By-Laws for the RSEA. Waldron agreed to contact the AAPM to find the name of = the person they use to handle their legal affairs. He will approach this = person to seek help in the incorporation process. The meeting was adjourned at 3:00 pm on Sunday July 23. Respectfully Submitted, James M. Galvin, D.Sc. Chair, AAPM Ad Hoc Committee - Formation of a Professional Society for Radiotherapy Accelerator Personnel ATTACHMENT -B Welcoming Speech Organizational Meeting Accelerator Engineers and Technicians = Professional Society July 22-23, 2000 Introduction and Welcome My name is Ken Hogstrom, and I am president of the AAPM. I = welcome each accelerator engineer and technician, our speakers, and members of = the AAPM ad-hoc committee supporting this effort to this very important = meeting. On behalf of the AAPM it is our pleasure to host this organizational = meeting of accelerator engineers and technicians for the purpose of forming = their own professional society. I am extremely delighted with the = turnout, which I understand has approximately 40 registrants, excluding our speakers. Recognition of Effort I want to recognize several of you who have assisted in having this = meeting. First, I want to recognize members of our AAPM ad-hoc = committee that is assisting you in this effort. First is its Chair, Jim Galvin and = Vice-Chair, Larry Berkley. Next, I would like to recognize members of our AAPM = headquarters staff, Executive Director Sal Trofi and Deputy Executive Director = Angela Keyser. Angela and another headquarters staff member, Farhana Khan, have = arranged the logistics of this meeting. Next, I want to introduce AAPM members = Jatinder Palta, liaison with our Radiation Therapy Committee, Marty Weinhous, = Almon Shiu, and Ned Sternick. Ned is serving as our procedural consultant. = I want to recognize our vendor liaisons, Tim Prosser from Elekta and Steve = Hotz from Siemens. Tom McCausland and Marty Shapiro are representing 3rd party = providers, and Tim Waldron and John Somers are representing radiation oncology = departments. History of AAPM Involvement For some time there has been interest amongst radiotherapy = accelerator maintenance personnel (engineers and technicians) to form a = professional society. Medical physicists in radiation oncology are = responsible for guaranteeing accurate delivery of the dose prescribed by the physician. = As part of that responsibility, medical physicists are frequently = responsible for accelerator maintenance, either through supervision of in-house = personnel or in cooperation with a vendor, a third party company, or in-house = biomedical service. Therefore, it is beneficial to the patient and to = the medical physicist to have the most qualified maintenance personnel and to = have a close professional relationship with them. Following two investigating = committee meetings (July 26 and October 31, 1999), there was a consensus to = proceed with this initiative with the assistance of an AAPM Ad-hoc Committee. Ad-hoc Committee Objectives The objectives of this committee are: (1) to provide the radiotherapy accelerator maintenance personnel an opportunity to form a professional society, (2) to facilitate the process so long as the radiotherapy accelerator maintenance personnel wish to proceed, and (3) to ensure that the AAPM and medical physicists maintain a strong professional relationship with radiotherapy accelerator maintenance = personnel through any society formed. To achieve these objectives, the ad-hoc committee has been charged = with the following: (1) Schedule and host a forum for Saturday and Sunday, July 22-23, = 2000, in which the planning for a professional society by radiotherapy = accelerator engineers and technicians will be initiated. (2) Provide leadership and logistics support throughout the process of = forming a professional society. (3) Encourage the formation of a professional society that will = promote a high degree of professionalism amongst its members and that will ensure a = continued high level of competition amongst companies providing radiotherapy = accelerator maintenance service. (4) Encourage the professional society to maintain a strong = professional relationship with medical physicists by incorporating features such as = allowing the AAPM to be a member organization, utilizing administrative services = of AAPM headquarters on a for-fee basis, conducting annual meetings in = conjunction with the AAPM annual meeting, and allowing medical physicists to have = associate or other class of membership. (5) Report regularly to the AAPM regarding the progress and make any = budget requests (with justification) as needed. Challenge for the Workshop My position as a professional medical physicist is enhanced by being a = member of the American Association of Physicists in Medicine. I know all of = its members are supporting medical physicists through volunteer services and = dues. These resources allow the Association to accomplish many things that = benefit our members, enhance our profession, and secure our future. The remainder of today and tomorrow you will be challenged to = develop a successful strategy to design and implement a professional society = that will belong to you. To be successful, you must begin to understand just = what is a professional society; you must create a vision for your professional = society; you must establish a plan to achieve that vision; and you must = identify leaders that will direct you though this process and serve in initial = leadership positions. The workshop this weekend will assist you in doing this. You can count on the AAPM providing you support through this process = as long as you desire it. After forming your society, the AAPM wishes = to provide opportunities that can enhance your society. We welcome our = developing a mechanism for having joint annual meetings, your allowing medical = physicists with appropriate interests and qualifications to be associate or other = class of member, and our finding a way to make some resources of the AAPM = headquarters office available to you. The latter will be very important to you as = the size of your professional society will not likely permit you to have = many of the management tools and space that our headquarters enjoy. Also, a = society?s stability is very dependent on the stability of its headquarters. = Again, being housed adjacent to our headquarters help create that stability. Closing You have an exciting list of speakers, a dedicated committee to assist = you, and a number of interested professionals. But most important each of you = must have a burning desire to create a professional society. I wish you a = successful meeting, and look forward to your forming a new society = representing professional accelerator maintenance engineers and technicians. ATTACHMENT ? C SOCIETY FOR RADIATION ONCOLOGY ACCELERATOR MAINTENANCE PERSONNEL Sheraton Chicago Hotel and Towers July 22 and 23, 2000 Erie Room Saturday, July 22 1:00-1:30 pm Welcoming Remarks Ken Hogstrom 1:30-2:00 pm Introduction Jim Galvin 2:00-3:00 pm The AAPM Headquarters Sal Trofi 3:30-4:00 pm AAPM Educational Activities Don Frey 4:00-5:00 pm Forming a New Society Ned Sternick 6:00-7:30 pm Reception Sunday, July 23 8:00-8:30 am Continental Breakfast 8:30-9:30 am The AAPM Placement Service Bob Rice 9:30-11:30 am Discussion and Brainstorming Everyone 11:30-12:00 noon Establishment of an Educational Don Frey Program (Brainstorming) 12:00-1:00 pm Lunch 1:00-2:30 pm Discussion and Brainstorming Everyone 2:30-3:00 pm Conclusion ? What next? Jim Galvin ATTACHMENT ? D FORMATION COMMITTEE C Timothy Waldron - Chair Jeff Peyton A Chuck Smith B Vince Ortiz Rich Kimball C Tim Cullen A Frank Spitz Jim Beaty - Vice Chair B Tom McCausland B Larry D Lorme Blair Free John Somers A David Lionnis __________________________ Subcommittees: A ByLaws B Statement of Purpose C Finance EDUCATION COMMITTEE Sheryl Brady Francis (Frank) Mertes Ricky Kreider Mark Wanlass John Somers Bill Hughes MEMBERSHIP COMMITTEE Larry Crowley Steve Kloster Richard Witham COMMUNICATIONS COMMITTEE Richard Witham ------_=_NextPart_002_01C19968.260B5550-- ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Theraplan Parts - Series 400. Message-ID: <00BE56E17E26D11197CB00805FA6803A04FAC204@mail.midcentral.co.nz> From: Keith Croft To: 'Linac eng' Subject: Theraplan Parts - Series 400. Date: Tue, 9 Jan 2001 14:25:59 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We are disposing of this machine - if anyone is interested in parts, such as the graphics cards, streamer tape unit etc let me know. Keith Croft, Palmerston North NZ. Sorry for being nothing to do with linacs exactly.... ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Mevatron Older Chamber High Voltage Supply Message-ID: <001101c07a61$1a4c5380$2d66aec7@techop.com> From: technical options To: Ken Allen , linac-eng@plato1.aristotle.net Subject: Re: Siemens Mevatron Older Chamber High Voltage Supply Date: Tue, 9 Jan 2001 09:25:02 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Dear Ken, We are able to supply you with the power supply that you need. (Plastic Capacitors part #HV10-152M). The majority of our parts are for the Varian accelerators, but we do have a few Siemens parts, too. Please give us a call at 800-755-9640 if you're interested. Lisa Przepasniak Technical Options of Georgia, Inc. P.S. Check out our website at www.technicaloptions.com. ----- Original Message ----- From: Ken Allen To: Sent: Monday, January 08, 2001 5:36 PM Subject: Siemens Mevatron Older Chamber High Voltage Supply > Greetings all, > We've got a dead Mevatron Chamber High Voltage Power Supply and it's been narrowed down to the HV Step-Up transformer (part no: HV10-152M made by Plastic Capacitors Inc. out of Chicago.) (Input 118Vac 50-500 Hz, Output 1KVdc 1.5mA) The company doesn't have stock. Anyone out there have a second source or some of the original units? > Thanks as always. > > > Ken Allen > Nuclear Electonics Technologist > CancerCare Manitoba > 675 McDermot Ave > Winnipeg, MB, Canada > R3E 0V9 > T: 204-787-2192 > F: 204-775-1684 > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Siemens Mevatron Older Chamber High Voltage Supply Message-ID: <6.107a75c7.278c7fcc@aol.com> From: Jhscruggs@aol.com To: Ken.Allen@cancercare.mb.ca, linac-eng@plato1.aristotle.net Cc: Radsrus@aol.com Subject: Re: Siemens Mevatron Older Chamber High Voltage Supply Date: Tue, 9 Jan 2001 06:53:00 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Ken, I am responding to your email. I have the power supply you need in stock. It is a High voltage P.S. part number HV10-152M from Plastic Capacitors. Our part number is 26 0415-00. Feel free to give me a call at RadParts our toll free number is 877-704-3838 or 847-735-8348. I look forward to hearing from you. Regards, Jeff Scruggs visit us at www.radparts.com The RadParts guys, Jeff, Dee, Randy ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: <3A5B21E8.FCD9445B@bellsouth.net> From: Gil Head To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: Cl.2100 Crowbar trouble Date: Tue, 9 Jan 2001 06:36:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" CJ.de.Bruijne@walcheren.ziekenhuis.nl wrote: > > Hi colleagues, > > In december we were called because of loud noises in the gantry. > We discovered the contact blade of the crowbar was travelling > trough the gun when turning the gantry. > Might have given large sparks! > > Our question to you: > Has such a thing ever happened in your department? > Yes, and the contact blade was so new and shiny that I didn't realize what is was at first. I had replaced the crowbar relay a relatively short period of time before this happened. The screw head was broken off. Gil -- "Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself." Mark Twain ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: From: David Burgess To: linac-eng@plato1.aristotle.net, CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: Re: Cl.2100 Crowbar trouble Date: Tue, 9 Jan 2001 06:36:34 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Keesjan, We have 2100C s/n 708. We've had a few problems on the Gun Deck because the Guns platform ( a rectangular sheet of metal ) flex's as the Gantry rotates. Some hardware came loose and we secured them with "Locktite". Also a stiffener was added to the platform ( our 2100CD s/n 1025 came with an improved platform ). So we had a loose screw on the crowbar ( not the blade as in your case ) and we contributed it to the platform flexing and vibration. Best regards David Burgess Nova Scotia Cancer Centre >>> 1/9/2001 7:54:24 AM >>> Hi colleagues, In december we were called because of loud noises in the gantry. We discovered the contact blade of the crowbar was travelling trough the gun when turning the gantry. Might have given large sparks! Our question to you: Has such a thing ever happened in your department? The crowbar was delivered okt. 1997 and placed march 2000 The screw that fastens the contact blade had spontaneous come loose within 9 months! Happy troublehunting, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 2300CD beam-finding (6X) problem Message-ID: From: David Burgess To: kimyeung@netvigator.com, Linac-Eng@plato1.aristotle.net Subject: Re: 2300CD beam-finding (6X) problem Date: Tue, 9 Jan 2001 06:19:50 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Kim, These are just some suggestions: 1. During your Beam Finding in 6X the LD PWR 2 ( Rabbit Ears) are not very conspicuous (due to the Energy Switch being in), but the Rabbit Ears are still viewable. Were you able to see anything of the Rabbit Ears on LD PWR 2 ? Target I you would look at later as you have got to tune the Accelerator Section first. Recall that the Target is after the Energy Slit. 2. The Target cable has a tendancy to break. Both ours broke the ground braid at the Target site. The Target signal was then just some garble ( noise) and some capacitive signal. Make sure yours is OK in 6X Target position. 3. I assume you took the ACC. SOL I value from the Display Analog Meters. You might be better to take the measure directly from the ACC SOL I Power Supply, just encase the meters display has significant error in gain or offset. Reducing ACC.SOL I to 70% is only a guideline and in 6X you may have to start higher ( due to Energy Switch). 4. Also, I think you should practise using 18X and get a good feel for it. Tune 18X to get a good high output dose ( if you have selected a RR for 400 MU/min., you should be able to tune it to get 600 mu/min). Then cut back Gun I etc. for your desired unservoed dose rate. That proves the machine is capabile of achieving a good high output dose. 18X is safer to practise with. Again look at LD PWR 2 for tuning the Accelerator Section, then move to Target I and adjust for maximum dose output and correct energy, etc. 5. I'll change SOL I on one of our units and let you know what parameters are most affected. Best regards David Burgess Nova Scotia Cancer Centre >>> "kimyeung@ultraline" 1/6/2001 10:02:15 AM >>> Hi Colleagues, We could not get target I pulse when we performed the beam finding on 2300CD's 6X. We followed the Varian's procedures. Firstly, we reduced BunR, BunT, AngR, AngT, PosR, PosT, GunI (0.5V) & RFDriver to minimum and set SOL I to 70%. and all servos were off, AFC was set to manual. We did set no mode when we changed the "orientation of SOL I adjustment. Then we increased Gun I, adjusted RF Driver and AFC in order to get a target I pulse but we could not manage to get the pulse although we had increase increased the Gun I to a high value and even we had tried to bring in SOL I, Bun R BUN T. When we put back all the previous data , recorded prior to the beam finding, the machine could give some output about 80% of the nominal. Can anyone kindly give advise or suggestion on this issue? If the SOL I for 6X is changed from 64% to 46% what is the physical interpretation of the change? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Cl.2100 Crowbar trouble Message-ID: From: aengstle@gundluth.org To: CJ.de.Bruijne@walcheren.ziekenhuis.nl Cc: linac-eng@plato1.aristotle.net Subject: Re: Cl.2100 Crowbar trouble Date: Tue, 9 Jan 2001 06:19:52 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I have had the crowbar center contact come loose but never off before. We have had trouble in the past with screws and other fasteners coming loose from the crowbar assy. and floating around inside of the gundeck. I try to check the condition of the crowbar during PM and use loctite when putting one in. Alan Engstler Gundersen Lutheran ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Cl.2100 Crowbar trouble Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: Cl.2100 Crowbar trouble Date: Tue, 9 Jan 2001 03:54:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi colleagues, In december we were called because of loud noises in the gantry. We discovered the contact blade of the crowbar was travelling trough the gun when turning the gantry. Might have given large sparks! Our question to you: Has such a thing ever happened in your department? The crowbar was delivered okt. 1997 and placed march 2000 The screw that fastens the contact blade had spontaneous come loose within 9 months! Happy troublehunting, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Siemens Mevatron Older Chamber High Voltage Supply Message-ID: From: Ken Allen To: linac-eng@plato1.aristotle.net Subject: Siemens Mevatron Older Chamber High Voltage Supply Date: Mon, 8 Jan 2001 14:36:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings all, We've got a dead Mevatron Chamber High Voltage Power Supply and it's been narrowed down to the HV Step-Up transformer (part no: HV10-152M made by Plastic Capacitors Inc. out of Chicago.) (Input 118Vac 50-500 Hz, Output 1KVdc 1.5mA) The company doesn't have stock. Anyone out there have a second source or some of the original units? Thanks as always. Ken Allen Nuclear Electonics Technologist CancerCare Manitoba 675 McDermot Ave Winnipeg, MB, Canada R3E 0V9 T: 204-787-2192 F: 204-775-1684 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100C Startup -Svar Message-ID: From: Torben Gade To: linac-eng@plato1.aristotle.net, peter.vitali@yale.edu Subject: Varian 2100C Startup -Svar Date: Mon, 8 Jan 2001 01:11:23 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello We got the problem when we make an upgrade from software 4.XX to 5.4. But after a while we got a new processor PCB from Varian and after that we can start up from power off without problems. I cannot remember the version of the new PCB but if anybody want to know it just give me a hint. Torben Gade Aalborg Sygehus Syd Denmark >>> "Peter E. Vitali" 05-01-01 18.21 >>> Happy New Year! Last year I asked a question on what was the sequence to start up a 2100C from power off condition. This came about because we were having a problem that when the machine came up there would always be a communication error interlock. Some people asked that when we found the solution to let them know. We have 2 2100Cs, Series or Version 2, serial numbers 228 and 408. Both have been upgraded to Varian Software Version 6.1 with new DELL Pentium Computers supplied by Varian. We do not suspect the Software version of being the culprit, but the speed of the new computer. The STD Bus Pro Log CPU in the machine run at a very slow speed and the Pentiums are very fast. This causes a timing problem which leads to a communication problem. The solution is : 1. Before turning on the Machine, Shut down the Computer in the Electronics Cabinet, in our case the DELL. 2. Turn the Machine 0n. 3. Wait till you hear 2 beeps from the dedicated key board. The STD is now up. Usually it takes 20 to 30 seconds after you turn the machine on. 4. Now turn on the Computer in the Electronics Cabinet. It should come up with no communication interlocks or errors. This has been our experience last 3 months. Hope this helps. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu 4. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: ELECTRONICS / I.T. TECHNICIAN Message-ID: <01Jan8.085723gmt.118082@minotaur.ulth.northy.nhs.uk> From: Bob Wheller To: linac-eng@plato1.aristotle.net Subject: ELECTRONICS / I.T. TECHNICIAN Date: Mon, 8 Jan 2001 00:57:20 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable THE LEEDS TEACHING HOSPITALS NHS TRUST PROFESSIONAL & TECHNICAL Medical Physics ELECTRONICS / I.T. TECHNICIAN=20 Cookridge Hospital Grade: MTO4 =A320,219 - =A324,473 p.a. - Hours 37 p.w. Ref: LRP 358 The radiotherapy centre based at Cookridge Hospital uses cutting-edge electronic technology in the treatment of cancer. An enthusiastic experienced electronics / I.T. technician with an interest in = contributing to this vital field of technological medicine is required to join an = expert team which provides technical support for treatment equipment, valued = in excess of =A35M, at this centre. You should hold an HNC or equivalent in electronic engineering or = computing, have substantial experience in practical electronics and/or proven = skills in IT systems support. The post would involve management of IT equipment within the Medical = Physics Department together with full participation in the team servicing the radiotherapy treatment equipment. =20 An appointment at a lower level may be considered for those with lesser experience. Application forms available from LTH central recruitment department, = 0113 206 6410, Trust HQ, St James's University Hospital, Beckett Street, = Leeds, LS9 7TF =20 or for informal discussion contact Bob Wheller, Chief Technician on = 0113 392 4246. Closing Date; 1st February 2001 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: long running problem Message-ID: From: CJ.de.Bruijne@walcheren.ziekenhuis.nl To: linac-eng@plato1.aristotle.net Subject: long running problem Date: Sun, 7 Jan 2001 22:56:24 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > Hi 'list'eners, > > A happy new year to all of you. > I hope as for us it had a very good start. > > Our long running problem about PFN voltages is solved at last. > It started in 1998 (maybe earlier) > We informed you more than a year ago (nov. '99) about it and > throughout 2000 we (hospital & Varian engineers) tried to nail it > down. > > Symptoms: > - irreguraly loss of doserate. > - all energies, Low e- (6,9,12) more sensitive to it as others. > - temporary solving of the problem by tweaking the PFN-pots > on the programboards. (w/o moving gun I, AFC or steering pots) > - reoccuring of the problem within some days.....weeks. > > Solution: > - renewal of the compensated HV divider in the modulator. > > The way to the solution: > Measuring a lot of parameters time on time and put it down in a > spreadsheet. > Also we watched the morningcheckoutlogs for months and months. > Finally we started to measure the PFN-V at the PFNdeck with a HV > probe. > At the faulty HV divider we found a bad resistor and a leaking > condensator. > > Many thanks to Dave Pinchin and his Excel spreadsheet for MC logs. > They were very helpful as you can see in the attached picture. > (o, sorry. This list doesn't swallow attachements I discover this monday morning) (Ill send it you private when your interested. Keesjan, 8 jan. 2001) > It proves once more this list is very helpfull for over ninehunderd > linac engineers > all over the world. > > > > Regards, > Keesjan de Bruijne > Ziekenhuis Walcheren > Vlissingen, the Netherlands > afd. DIA > cj.de.bruijne@walcheren.ziekenhuis.nl > > -----Original Message----- From: Bruijne, Keesjan de Sent: Friday, January 05, 2001 9:05 AM To: 'Linac questions (and answers)' Subject: long running problem ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 2300CD beam-finding (6X) problem Message-ID: <3A572567.2D562FAE@netvigator.com> From: "kimyeung@ultraline" To: "''Linac-Eng@plato1.aristotle.net' '" Subject: Re: 2300CD beam-finding (6X) problem Date: Sat, 6 Jan 2001 06:02:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Colleagues, We could not get target I pulse when we performed the beam finding on 2300CD's 6X. We followed the Varian's procedures. Firstly, we reduced BunR, BunT, AngR, AngT, PosR, PosT, GunI (0.5V) & RFDriver to minimum and set SOL I to 70%. and all servos were off, AFC was set to manual. We did set no mode when we changed the "orientation of SOL I adjustment. Then we increased Gun I, adjusted RF Driver and AFC in order to get a target I pulse but we could not manage to get the pulse although we had increase increased the Gun I to a high value and even we had tried to bring in SOL I, Bun R BUN T. When we put back all the previous data , recorded prior to the beam finding, the machine could give some output about 80% of the nominal. Can anyone kindly give advise or suggestion on this issue? If the SOL I for 6X is changed from 64% to 46% what is the physical interpretation of the change? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Job Posting - Linac engineering technician position Message-ID: From: Eric Earnst To: linac-eng@plato1.aristotle.net Subject: Job Posting - Linac engineering technician position Date: Fri, 5 Jan 2001 19:08:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all, Another position related to the first post I sent today, it also isn't service related but I'm hoping you can pass it along to people you = think might be qualified (I'll be quiet after this). We also have openings = in our service organization, if you are interested, let me know and I will = pass you to the right person. Boilerplate: Accuray, Inc. is seeking a highly self-motivated and energetic = individual to fill a position of Senior Electronics Technician in their Hardware Engineering group. Primary responsibilities for this position are = assembly, test and troubleshooting of prototype hardware with emphasis on the = linac subsystem of the CyberKnife=AE. Qualified individuals should have = broad experience ranging from board level to 19-inch equipment racks; = experience with linear accelerators or high power RF is very desirable. Drafting ability a strong plus. This position requires an Associates Degree in Electrical, Mechanical = or Manufacturing Engineering and/or equivalent experience. Candidate must = be very detail and quality oriented, with proven ability to work in a = small team environment and effectively meet deadlines. Must have strong troubleshooting and test skills. Accuray Incorporated, located in Sunnyvale, CA, is an exciting medical start-up whose primary objective is the development of the CyberKnife image-guided stereotactic radiosurgery system. This device precisely delivers collimated beams of radiation for the primary purpose of = destroying solid tumors, while preserving the surrounding normal tissue. More information on the CyberKnife=AE system and Accuray is available on our website: http://www.accuray.com/ . End boilerplate Accuray is moving from low rate production to higher rates and find = that we need more control of how our linac is engineered and built. We = currently buy it from an outside vendor but we have full manufacturing rights. = The linac operates at 6 MV, 9.3 GHz, 300 rads/min with circular cross = section collimators ranging from 5 to 60 mm. The accelerator and microwave components are located on the end effector of a large 6 degree of = freedom robot that allows delivery of radiation from many different angles. We = also have an x-ray imaging subsystem that allows us to eliminate frames. Thanks, Eric =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D Eric Earnst Director of Product Hardware Accuray, Inc. 570 Del Rey Ave Sunnyvale, CA 94086 408-522-3740 x379 408-522-3749 fax ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Job Posting - Linac engineering position Message-ID: From: Eric Earnst To: linac-eng@plato1.aristotle.net Subject: Job Posting - Linac engineering position Date: Fri, 5 Jan 2001 11:35:15 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all, One of our service guys just passed me the info on this list. The = position isn't service related but I'm hoping you can pass it along to people = you think might be qualified. Boilerplate: Accuray, Inc. is seeking a highly self-motivated and energetic = individual to fill a position of Project Lead in their Hardware Engineering group. = This individual will provide leadership of a project to transfer the = technology for an X-band linear accelerator from an outside supplier to in-house engineering and production control. Qualified individuals should have = broad electronics, integration and troubleshooting experience; experience = with linear accelerators or high power RF is very desirable. They should = also have the ability to take a design from the concept stage through build, = test and integration using a combination of analytic and hands-on = techniques. This position requires a BS EE or equivalent, and 7+ years experience. Project management experience required. Prior experience with = FDA/UL/IEC design requirements a plus. Candidate must be detail and quality = oriented, with proven ability to work in a team environment and effectively meet deadlines. Must have excellent communication skills. Accuray Incorporated, located in Sunnyvale, CA, is an exciting medical start-up whose primary objective is the development of the = CyberKnife=AE image-guided stereotactic radiosurgery system. This device precisely delivers collimated beams of radiation for the primary purpose of = destroying solid tumors, while preserving the surrounding normal tissue. More information on the CyberKnife=AE system and Accuray is available on our website: http://www.accuray.com/ . End boilerplate Accuray is moving from low rate production to higher rates and find = that we need more control of how our linac is engineered and built. We = currently buy it from an outside vendor but we have full manufacturing rights. = The linac operates at 6 MV, 9.3 GHz, 300 rads/min with circular cross = section collimators ranging from 5 to 60 mm. The accelerator and microwave components are located on the end effector of a large 6 degree of = freedom robot that allows delivery of radiation from many different angles. We = also have an x-ray imaging subsystem that allows us to eliminate frames. Thanks, Eric =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D Eric Earnst Director of Product Hardware Accuray, Inc. 570 Del Rey Ave Sunnyvale, CA 94086 408-522-3740 x379 408-522-3749 fax ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: 2100 Varian Ser 224 couch check favor. Message-ID: From: Robert Wood To: linac-eng@plato1.aristotle.net Subject: 2100 Varian Ser 224 couch check favor. Date: Fri, 5 Jan 2001 10:11:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" I need a favor from some of you people that have Varians about the same vintage as mine. Have you ever set couch rotation at 90 degrees, marked the cross hairs, and rotated to 270 on couch rotation, checked the walk out, then returned to 90 and see if there was a change. I have checked it many times but never took it back to 90 to check the reference. I am curious as to what you find. Would you let me know. I was surprised at what I found. BTW, The couch is an ETR. Robert Wood "Woody" MSTI Boise, Id (208)381-2702 Any views or opinions expressed in this email (unless otherwise stated) are mine and do not reflect the opinions or policies of any other person or organization. This email may contain personel or private information and the foregoing is not intended to be a legally binding or legally effective electronic signature. This message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify me, disregard the foregoing message, and delete the message immediately. I apologize for any inconvenience this may have caused. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varian 2100C Startup Message-ID: <3A560270.668917A0@yale.edu> From: "Peter E. Vitali" To: "Linac-Engineers, Listserver" , "Medical Physics, Listserver" Subject: Varian 2100C Startup Date: Fri, 5 Jan 2001 09:21:43 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Happy New Year! Last year I asked a question on what was the sequence to start up a 2100C from power off condition. This came about because we were having a problem that when the machine came up there would always be a communication error interlock. Some people asked that when we found the solution to let them know. We have 2 2100Cs, Series or Version 2, serial numbers 228 and 408. Both have been upgraded to Varian Software Version 6.1 with new DELL Pentium Computers supplied by Varian. We do not suspect the Software version of being the culprit, but the speed of the new computer. The STD Bus Pro Log CPU in the machine run at a very slow speed and the Pentiums are very fast. This causes a timing problem which leads to a communication problem. The solution is : 1. Before turning on the Machine, Shut down the Computer in the Electronics Cabinet, in our case the DELL. 2. Turn the Machine 0n. 3. Wait till you hear 2 beeps from the dedicated key board. The STD is now up. Usually it takes 20 to 30 seconds after you turn the machine on. 4. Now turn on the Computer in the Electronics Cabinet. It should come up with no communication interlocks or errors. This has been our experience last 3 months. Hope this helps. Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu 4. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mevasim spares Message-ID: From: STEVE BROWN To: linac-eng@plato1.aristotle.net Subject: Mevasim spares Date: Thu, 4 Jan 2001 07:41:04 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Sorry wrong phone number in previous message - should be 01463 704000, Page 1120. Steve. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Mevasim spares Message-ID: From: STEVE BROWN To: linac-eng@plato1.aristotle.net Subject: Mevasim spares Date: Thu, 4 Jan 2001 06:40:38 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" We will be decommissioning and disposing of a Siemens Mevasim / Mecaserto simulator this month (Jan 2001) at Inverness, Scotland. If anyone is interested in spares or parts, e-mail me at above address or telephone 01462 704000, Page 1120. Regards, Steve Brown. ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Theratronics Therasim 750 Message-ID: <3A5338A4.159B3672@scf.sk.ca> From: Robert Penley To: Linac list Subject: Theratronics Therasim 750 Date: Wed, 3 Jan 2001 06:35:16 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Seasons Greetings to all We are removing our old (AECL) Theratronics Therasim750 simulator Ser#101 and spare card rack and cards. If anybody is interested in it or parts for free please let us know very soon as we are going to dispose of it this month (January 2001). The Raytheon RMX-525R/F Generator is of very old vitage and has problems. Robert Penley Saskatoon Cancer Centre rpenley@scf.sk.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Varis Vision 6 Message-ID: From: Carl Murphy To: linac-eng@plato1.aristotle.net Subject: Varis Vision 6 Date: Tue, 2 Jan 2001 11:26:17 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Folks: Has anyone out there upgraded from Varis Vision version 5 to version 6? We have 4 treatment units with ver 5 now. I would like to know any improvements/changes made with the software. There are a lot of quirks with version 5 that I would like to see settled. Thanks in advance, Carl Murphy, C.E.T. Linear Accelerator Service Technologist Medical Physics Department Nova Scotia Cancer Centre Queen Elizabeth II Health Sciences Centre phone: (902) 473-6152 fax: (902) 473-6120 email: ccchm@qe2-hsc.ns.ca ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: UPS Power Supply for linacs? Message-ID: <3A520987.1C5C8064@yale.edu> From: "Peter E. Vitali" To: Ron Kimber Cc: linac-eng@plato1.aristotle.net Subject: Re: UPS Power Supply for linacs? Date: Tue, 2 Jan 2001 09:02:31 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ron: Be careful of the current carrying capability of the UPS. Make sure it can take the current drawn when the beam is first turned on. Do not go by the power rating because that is usually for a continuous current, not instantaneous. You may have to double the power rating to handle the current surge. We had a CGR Sagittiare which ran at 50 cycles so we had to have a motor generator supply it. When the beam turned on the generator would change frequency and the power would go down. It was audible and I use to use the sound to tell me when beam on was occurring when I was working in the modulator room . Next question: Why go to a UPS for stabilizing the line? Unless you have a lot of short power outages I see no benefit, plus you incur the expense of replacing the batteries every two to three years. If your power is so bad that it took out a stabilizer/conditioner what makes you think it wound not take out the UPS at a higher cost? Peter E. Vitali, CBET Therapeutic Radiological Engineer Department of Radiation Physics Yale-New Haven Hospital 15 York Street New Haven, CT. 06504 U.S.A. Tel: 203 688-2948 Fax: 203 688-3663 E-Mail: peter.vitali@yale.edu ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: 2300CD Low unservoed dose rates Message-ID: From: David Burgess To: kimyeung@netvigator.com, Linac-Eng@plato1.aristotle.net Subject: Re: 2300CD Low unservoed dose rates Date: Tue, 2 Jan 2001 07:33:06 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Kim, You could try the following basic sequence: 1. Is the 3 phase power line OK ? 2. Is the De Quing % OK ? 3. Is the PFN V OK ? 4. Is Vacuum OK ? 5. Is the Gun Filament emission OK ? 6. Is the Forward PWR OK ? 7. Is the Reflected PWR OK ? 8. Is Target I OK ? 9. Is Timing OK ? 10. Is Steering OK ? 11. Is AFC OK ? 12. Is Ion Chamber OK ? You should be able to compare these to an older PM. At least one of these has to have a problem. Also recall that 6X uses a higher Gun I (more emmission) than all other energies, 6X also uses the highest HVPS I, consumes the highest electrical power, and runs at the highest RF Driver Frequency ( about 2856.5 MHz vs 2856.0 for other energies). I suspect you may have a Gun Emission problem and may have to increase your Gun Filament voltage. If thats what the problem is, you may see a hole in Target I. Good luck with it. David Burgess Nova Scotia Cancer Centre >>> "kimyeung@ultraline" 12/30/2000 9:10:29 AM >>> Hi Colleagues, Happy New Year! The unservoed dose rates of 2300CD are reducing for all energies. 6x is more pronounced, and its unservoed dose rate is less than the nominal value. The 2300CD had suffered from loose solenoid problem about one year ago and now all the set screws are tightened and beam flatness and symmetry of all energies are good. The low unservoed dose rate problem occurs at all gantry angles. We had tried to adjust Gun I, AFC and RF driver, but failed to increase the unservoed dose rate. Could anyone advise what are the possible causes of the low unservoed dose rate? Thanks in advance. Kim Yeung ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Captive washers - Varian Message-ID: From: david hall Reply-To: hall.david@lycos.com To: "Linac Engineers List Server (E-mail)" , Cripps Steve Subject: Re: Captive washers - Varian Date: Tue, 2 Jan 2001 06:25:45 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hello, Varian has a hardware code which is the basis for the methods used in their assembly process. Regards, David Hall -- On Tue, 2 Jan 2001 22:28:48 Cripps Steve wrote: >This is probably not a new question and I hope not a trivial one, but I have >never received an adequate answer. >With the many hundreds of screen screws etc on Varian machines, why do >Varian insist on using flat and spring washers which are not captive on the >screws themselves. > >I worked in the automotive industry for many years, where most bolts and >screws (particularly Japanese vehicles) have flat and spring washers >permanently mounted on them. This has obvious benefits for service personnel >as well as factory assembly personnel. > >I know the old saying that "Designing for ease of service is an un-necessary >cost" but the cost saving in labour for factory assembly and Varian service >personnel must be far greater than the incremental cost of changing to these >types of fasteners. > >Well that's my gripe for 2001, happy new year all. > >Steve Cripps >Engineering Operations Manager > >Royal Hobart Hospital >Department of Radiation Oncology >(WP Holman Clinic) >GPO Box 1061L >Hobart 7001 >Australia > >Phone: >Switch 03 6223 4000 >Direct 03 6222 8618 >Fax 03 6234 8036 >Mobile 0408 136 906 >International +61 3 6223 4000 > > Get FREE Email/Voicemail with 15MB at Lycos Communications at http://comm.lycos.com ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Re: Captive washers - Varian Message-ID: From: David Burgess To: steve.cripps@dchs.tas.gov.au, linac-eng@plato1.aristotle.net Subject: Re: Captive washers - Varian Date: Tue, 2 Jan 2001 05:43:25 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hi Steve et al, Right on ! I heard that the Clinacs now in manufacture use captive fasteners. We converted our 4 Clinacs to our own captive fasteners and it has been a major time saver. They have 9/64 socket head screws ( Allen head or hex head) and fit on our power screw drivers. They stay on the screw driver tip unless they are pointing downward, in which case they drop off. They are all one size and length so you don't have to be concerned about getting the wrong one in the wrong hole. They are 8-32 thread and have a lockwasher and flatwasher all in one captive unit. But there is initially some work to them. We bought the flatwashers and tapped them ( we purchased the thicker flatwashers so they are thick enough to have several threads and less tendancy to strip), tapping about 1000 takes about 2 hours on a lathe. Then our machinist assembled about 1000 of these captive fasteners using the screw, lockwasher and threaded flatwasher. We then installed them whenever we worked on a Clinac. Anyway, Varian probably have a part number for the new ones they are using. If you would like to see what we have made up, I'll send you some samples and details. David Burgess Nova Scotia Cancer Centre Halifax, Canada ccwdb@qe2-hsc.ns.ca >>> Cripps Steve 1/2/2001 7:28:48 AM >>> This is probably not a new question and I hope not a trivial one, but I have never received an adequate answer. With the many hundreds of screen screws etc on Varian machines, why do Varian insist on using flat and spring washers which are not captive on the screws themselves. I worked in the automotive industry for many years, where most bolts and screws (particularly Japanese vehicles) have flat and spring washers permanently mounted on them. This has obvious benefits for service personnel as well as factory assembly personnel. I know the old saying that "Designing for ease of service is an un-necessary cost" but the cost saving in labour for factory assembly and Varian service personnel must be far greater than the incremental cost of changing to these types of fasteners. Well that's my gripe for 2001, happy new year all. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: RE: UPS Power Supply for linacs? Message-ID: <3AE23899EECFD411B2210008C7B2BF399F5053@wmhmail.whs.org> From: "Williams, Rod" To: 'Ron Kimber' , linac-eng@plato1.aristotle.net Subject: RE: UPS Power Supply for linacs? Date: Tue, 2 Jan 2001 05:47:27 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings to all also, for what it is worth I have found that it is worth while to spend a couple hours to tighten all the connections in these power conditioners, I had one burn up (one phase to the ckt breaker) and after that I found that many of the connections were not as tight as they should be, now as a annual P.M. I run though the three I have. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Ron Kimber [SMTP:procbms@iinet.net.au] > Sent: Monday, January 01, 2001 9:22 PM > To: linac-eng@plato1.aristotle.net > Subject: UPS Power Supply for linacs? > > Greetings all, > > I trust the festive season has been kind to you and that the break has > been > most enjoyable. > > My enquiry of you is regarding the use of battery backed supplies for > linacs. > > We recently lost a line conditioner after a fairly dirty power outage. > Now > that it is time to replace it we are looking at the alternatives. We > could > go back to a stabiliser/conditioner or else step up to a battery backup > UPS. (at a slight increase in cost.) > > It is intended to purchase a 45kVA unit with 8 minute backup at full load. > > Has anyone had experience with these units running a linac. I wouldn't > imagine any problems but I would appreciate some assurance, or otherwise, > from anyone in the know before we purchase. > > Many thanks in anticipation. > ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: Captive washers - Varian Message-ID: <4064724DF431D31183EF00805F8BC6E2013BB124@exch.dchs.tas.gov.au> From: Cripps Steve To: "Linac Engineers List Server (E-mail)" Subject: Captive washers - Varian Date: Tue, 2 Jan 2001 03:28:48 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" This is probably not a new question and I hope not a trivial one, but I have never received an adequate answer. With the many hundreds of screen screws etc on Varian machines, why do Varian insist on using flat and spring washers which are not captive on the screws themselves. I worked in the automotive industry for many years, where most bolts and screws (particularly Japanese vehicles) have flat and spring washers permanently mounted on them. This has obvious benefits for service personnel as well as factory assembly personnel. I know the old saying that "Designing for ease of service is an un-necessary cost" but the cost saving in labour for factory assembly and Varian service personnel must be far greater than the incremental cost of changing to these types of fasteners. Well that's my gripe for 2001, happy new year all. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 ------_=_NextPart_000_01C19968.260B5550 Content-Type: message/rfc822 Content-Description: UPS Power Supply for linacs? Message-ID: <4.1.20010102104950.00923280@mail.iinet.net.au> From: Ron Kimber To: linac-eng@plato1.aristotle.net Subject: UPS Power Supply for linacs? Date: Mon, 1 Jan 2001 19:22:08 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Greetings all, I trust the festive season has been kind to you and that the break has been most enjoyable. My enquiry of you is regarding the use of battery backed supplies for linacs. We recently lost a line conditioner after a fairly dirty power outage. Now that it is time to replace it we are looking at the alternatives. We could go back to a stabiliser/conditioner or else step up to a battery backup UPS. (at a slight increase in cost.) It is intended to purchase a 45kVA unit with 8 minute backup at full load. Has anyone had experience with these units running a linac. I wouldn't imagine any problems but I would appreciate some assurance, or otherwise, from anyone in the know before we purchase. Many thanks in anticipation.