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¹Department of Neurosurgery
²Division of Pediatric Neurosurgery, School of Medicine, Gazi University, Ankara,Turkey Awide application field, high precision and low complication and high success rates make Gamma Knife radiosurgery a standard treatment modality in neurosurgery. During Gamma Knife radiosurgery, 201 cobalt 60 sources are arranged in a hemispheric shape in such a manner that all the gamma rays are focused at the center to create a cumulative radiation field. The total energy of the rays is therefore transmitted precisely to the target with preservation of normal brain tissue. The Leksell Gamma Knife has undergone numerous refinements, additions and modifications since 1967. Additions and refinements in Gamma Knife radiosurgery are still continuing parallel to developing technology. We present the new Gamma Knife (Model C) and the latest version of Gamma Plan (Gamma Plan 4C) in use at the Department of Neurosurgery of Gazi University School of Medicine, the 207th Gamma Knife Radiosurgery center in the world. Gazi University Gamma Knife Center is the first center using Gamma Plan 4C in the world. Information on new developments in Gamma Knife radiosurgery is presented instead of the indications and results. Keywords : Automatic Positioning System, Gamma Knife, Gamma Plan 4C, stereotactic radiosurgery