Comparative Evaluation of Two Different Radiosurgery

Gamma Knife Radiosurgery is a very precise form of therapeutic radiology. Even though it is called surgery, a Gamma Knife procedure does not involve actual surgery but it uses 192 isocentric beams of highly-focused gamma rays (60-Co) to treat small to medium size lesions. Minimum beam size is 4 mm. This procedure is frame based.

EDGE linear accelerator from Varian (Varian, Palo Alto, USA) is a C-arm machine specifically developed for radiosurgery frameless treatment. The characteristics of this linac are a high level of precision and the possibility to include multiple positioning systems for stereotactical treatments, among which Cone Beam CT (CBCT), the Optical Surface Monitoring System (OSMS), and Calypso.