Position Verification System (PVS)
Using two simultaneous taken x-ray-pictures and the therapy plan a 6 degrees of freedom correction vector is calculated. This correction vector will be sent directly to the control system of the Patient Positioning System and allows therefore the highest precision of tumour positioning.
Moving the Gantry rotation during x-ray acquisition allows to generate a Cone Beam CT (CBCT) at the iso centre. This gives the possibility to adapt the treatment plan according to the change of tumour shape according to the treatment progress.
|Two x-ray tubes||150 kV fluoroscopy tube|
|Two flat panels||300 mm x 400 mm pixel area|
|Pixel size||0.194 mm|
|Data processing||30 fluoroscopy images per second (2x2 binning)
7.5 fluoroscopy images per second full resolution
|Mechanical precision||0.3 mm|
Position Verification System for 360° Gantry (incl. Cone-Beam)