Linac Geocheck, SeeDOS Code GC1

The Geocheck-1 for fast and precise geometric tests of linear accelerators

The Geocheck-1 provides a fast and simple way to verify recommended (i.e. TG40), periodic checks of the treatment system and to perform higher level physics tests.

With Geocheck-1, the following parameters can be evaluated. Alignment of the laser system Mechanical isocenter 0°- 90°- 270° Agreement between the light field axis and the mechanical axis of the collimator Indication of the size of collimators Symmetry of collimators Collimator rotation scale Effect of gravity position on collimators at 90° and at 270° Value of the ODI isocenter distance Variations of the ODI with gantry rotation Linearity of the ODI Direction and scale of the rectilinear movements of the table Isocenter and scale of the rotation movement of the table Geometrical focus

Geocheck-1   -    SeeDOS Code GC1

For a more detailed account of the Geocheck phantom please click here          (pdf file)

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Please contact Colin Walters at cwalters@seedos.com if you would like further  information or you have questions or comments about this web site. SeeDOS Ltd, 26, The Maltings, Leighton Buzzard, Bedfordshire LU7 4BS, United Kingdom Tel: +44 1525 850 670  • Fax: +44 1525 850 685