title: Gamma Knife surgery: past to Perfexion.
authors.affiliation: Department of Neurological Surgery, University of Virginia Health System, Charlottesville, Virginia, USA.
authors.forename: Jason
authors.initials: J
authors.lastname: Sheehan
mesh_terms: D006801:Humans; D016634:Radiosurgery / Q000295:instrumentation / Q000379:methods