Assessment of single isocenter linear accelerator radiosurgery for metastases and base of skull lesions

Gamma Knife (GK) with a stereotactic frame has long been considered the standard in stereotactic radiosurgery treatments for its steep dose gradients, good conformity, and rigid fixation allowing for limited or no treatment margin [1]. The GK Perfexion system (Elekta Medical Systems, Stockholm, Sweden) divides 192 Cobalt-60 (Co-60) sources into eight sectors that can be individually collimated or blocked in order to create variously shaped dose distributions [2]. The GK Icon system (Elekta Medical Systems, Stockholm, Sweden) further extends the technology with the incorporation of both a cone-beam computed tomography (CBCT) system and an infrared intrafraction motion management system to more safely use a thermoplastic masking system instead of frame-based immobilization [3].
Source: Physica Medica: European Journal of Medical Physics - Category: General Medicine Authors: Tags: Technical note Source Type: research