Abstract
The stereotactic intracranial Radiotherapy (SRS) Imaging-guided (IGRT) has increased its developments in few years because of the possibility to target lots of brain tumors also very small thanks to the new hardware tecnologies. SRS represents the main surgical alternative for patients with high risk complicances. This treatments requires a technology ensuring a great accuracy during X-ray exposure on the target as planned. In Perrino's Radiotherapy there are two linacs with two different tecnologies ensuring the patient's set-up accuracy (less than 1 mm). The first one is the OBI system mounted on Linac Trilogy, the second one Brainlab ExacTrac on Linac Unique. The aim of this comunication is to compare the two different system, to know which is the most appropriate ad finally to justify why a new tecnology such as Exactrac is installed on a less performing linac.
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