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Choice of phantom materials for dosimetry of Leksell Gamma Knife unit: A Monte Carlo study
Author(s) -
Cheung Joel Y. C.,
Yu K. N.,
Yu C. P.,
Ho Robert T. K.
Publication year - 2002
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1508797
Subject(s) - imaging phantom , dosimetry , monte carlo method , collimator , materials science , nuclear medicine , biomedical engineering , medical physics , physics , optics , medicine , mathematics , statistics
In calculations for the Leksell Gamma Knife, GammaPlan employs a tissue equivalent material without the presence of a skull bone, while dosimetry work is based on a polystyrene phantom. The compatibility of these dose distributions is uncertain. The Monte Carlo technique was employed to determine the radial dose distributions from a single 14 mm collimator helmet in 160 mm diam phantoms with different materials. The materials studied were polystyrene, perspex, water, and water with skull bone. Results showed no significant differences among the radial doses in different phantom materials for the 14 mm collimator helmet. The Monte Carlo simulation was repeated with the inclusion of all 201 sources. Again, no significant differences were observed.