New patient laser alignment

By Frans Sturm.

Laserline Positioning System

This is our new laserline patient positioning system, designed by Frans Sturm.

                              

We have two older laserline systems.
One system uses a helium-neon laser tube and a beam splitter which splits the laserbeam into a horizontal and a vertical laserline.
The other system has separate diode lasers, but is still difficult to adjust.
Our new unit is an improved design of this last system.



In each treatment shelter we have 5 laserline units for patient alignment:
two horizontal (left and right) and
three vertical (left, right and longitudinal).
The laserline unit is suitable for use in horizontal or vertical position.

The high located vertical unit ensures a clear laser line at the top of the patient
without the need of an extra laser at the ceiling.

                                            

The laserline unit exists of a green diode-laser, two lenses and a cylindrical mirror.

The lenses are mounted in adjustable lensholders for easily focussing the laserline at patientplane.

These parts are mounted on a stainless steel rod, which is made tiltable by rotating a fine-threaded handscrew.

This section is placed on a wallplate, with four handscrews you can fine-adjust and lock the horizontal or vertical position.

                                                                                                                                                                                                                                                                                                                 

This new design has strong advantages:

*  The wallplate has slotted holes for accurate fixing on the concrete treatment room walls.

*  With four adjusting screws it's easy to adjust and lock the exact horizontal or vertical position.

*  The spring-loaded tilt adjusting screw provides accurate adjustment of the laserline on isocentre.

*  To focus the laserline at isocentre, the lenses can easily be adjusted and fixed.

* Easy replacement of the diode-laser without loss of adjustments.

* Simple and solid design.

Suppliers:

Diode lasers: www.intelite.com

Cylindrical mirrors: TNO, Industrie en techniek, Delft, The Netherlands, (dick.debruijn@tno.nl)

Springs: www.tevema.nl

Linos Photonics lenses: www.radiometer.nl

Magnets: www.goudsmit-magnetics.nl

Interested? Questions?

Do you want to order complete laserline units?

You want to have drawings or specifications?

Please feel free to contact us:


Frans Sturm

Dpt. of Radiotherapie, University Medical Centre

Utrecht, The Netherlands.

(+ 31) 30 - 250 8456

f.c.sturm@azu.nl

or:


Jan Kok

j.g.m.kok@umcutrecht.nl