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Absorbed fractions in a voxel‐based phantom calculated with the MCNP‐4B code
Author(s) -
Yoriyaz Hélio,
dos Santos Adimir,
Stabin Michael G.,
Cabezas Roberto
Publication year - 2000
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 - 10.1118/1.599021
Subject(s) - imaging phantom , voxel , nuclear medicine , dosimetry , code (set theory) , physics , computer science , medicine , artificial intelligence , set (abstract data type) , programming language
A new approach for calculating internal dose estimates was developed through the use of a more realistic computational model of the human body. The present technique shows the capability to build a patient‐specific phantom with tomography data (a voxel‐based phantom) for the simulation of radiation transport and energy deposition using Monte Carlo methods such as in the MCNP‐4B code. MCNP‐4B absorbed fractions for photons in the mathematical phantom of Snyder et al. agreed well with reference values. Results obtained through radiation transport simulation in the voxel‐based phantom, in general, agreed well with reference values. Considerable discrepancies, however, were found in some cases due to two major causes: differences in the organ masses between the phantoms and the occurrence of organ overlap in the voxel‐based phantom, which is not considered in the mathematical phantom.