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This study analyses the dose difference for a variety of phantom materialsthat can be used for Leksell Gamma Knife. These materials have properties thatare very similar to the human tissue not including the skull bone. Geant4 wasemployed in the analysis the dose distributions for collimator helmet sizes of4mm and 8mm. The phantom had a radius of 80mm. Water, brain, PMMA (Poly-methylmethacrylate) and polystyrene were used as the material types. Results showedno considerable differences for radiation dosimetries depending on the materialtypes. In addition, the polystyrene and PMMA (Poly-methyl methacrylate) phantomare also suitable for measuring the dose profiles of the Gamma Knife unit.

Geant4 based Dosimetry Evaluation for Gamma Knife using Different Phantom Materials