The Elekta Leksell Gamma Knife instrument was used for GKRS treatment. The B-type gamma knife unit was used before April 2014, and the Perfexion unit was used from April 2014 to the present. After local anesthesia, Leksell stereotactic frame G was placed, and then, contrast magnetic resonance imaging (MRI) was performed to obtain tumor imaging for target delineation. Medical physicists, radiation oncologists, and neurosurgeons designed GKRS treatment plans. In this study, single-session GKRS was used for all patients.
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