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Figure 3: Leksell Gamma Knife Perfexion radiation unit and collimator system. (a) Cross-section of the Perfexion radiation unit. (b) Detailed view of sectors. Each sector holds 24 cobalt-60 sources and can be moved independently of other sectors in desired position to define a collimator size or block beams

Figure 3: Leksell Gamma Knife Perfexion radiation unit and collimator system. (a) Cross-section of the Perfexion radiation unit. (b) Detailed view of sectors. Each sector holds 24 cobalt-60 sources and can be moved independently of other sectors in desired position to define a collimator size or block beams