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Benchmarking BrachyDose: Voxel based EGSnrc Monte Carlo calculations of TG‐43 dosimetry parameters
Author(s) -
Taylor R. E. P.,
Yegin G.,
Rogers D. W. O.
Publication year - 2007
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 - 10.1118/1.2400843
Subject(s) - voxel , dosimetry , monte carlo method , nuclear medicine , physics , brachytherapy , computational physics , mathematics , radiation therapy , statistics , medicine , radiology
In this study, BrachyDose, a recently developed EGSnrc Monte Carlo code for rapid brachytherapy dose calculations, has been benchmarked by reproducing previously published dosimetry parameters for three brachytherapy seeds with varied internal structure and encapsulation. Calculations are performed for twoI125seeds (Source Tech Medical Model STM1251 and Imagyn isoSTAR model 12501) and onePd103source (Theragenics Model 200). Voxel size effects were investigated with dose distribution calculations for three voxel sizes: 0.1 × 0.1 × 0.1mm 3 , 0.5 × 0.5 × 0.5mm 3 , and 1 × 1 × 1mm 3 . In order to minimize the impact of voxel size effects, tabulated dosimetry data for this study consist of a combination of the three calculations: 0.1 × 0.1 × 0.1mm 3voxels for distances in the range of 0 < r ≤ 1 cm , 0.5 × 0.5 × 0.5mm 3voxels for 1 < r ≤ 5 cm and 1 × 1 × 1mm 3voxels for 5 < r ≤ 10 cm . Dosimetry parameters from this study are compared with values calculated by other authors using Williamson's PTRAN code and to measured values. Overall, calculations made with Brachydose show good agreement with calculations made with PTRAN although there are some exceptions.