Posture-dependent dose coefficients of mesh-type ICRP reference computational phantoms for photon external exposures.

Posture-dependent dose coefficients of mesh-type ICRP reference computational phantoms for photon external exposures.
Phys Med Biol. 2019 Feb 21;:
Authors: Yeom YS, Han H, Choi C, Nguyen TT, Shin B, Lee C, Kim CH
Abstract
Recently, the International Commission on Radiological Protection (ICRP) developed new mesh-type reference computational phantoms (MRCPs) that provide high deformability compared with the current voxel-type reference computational phantoms of ICRP Publication 110. Taking advantage of this deformability, in the present study, the MRCPs were deformed to five non-standing postures (i.e., walking, sitting, bending, kneeling, and squatting) by developing and using a systematic posture-change method based on the as-rigid-as-possible (ARAP) shape-deformation algorithm and motion-capture technology. The non-standing MRCPs were then implemented in the Geant4 Monte Carlo code to calculate a comprehensive dataset of dose coefficients (DCs) for photon external exposures. These include the dose coefficients for 29 individual organs/tissues and the dose coefficients for effective doses from 0.01 MeV to 10 GeV in the antero-posterior (AP), postero-anterior (PA), left-lateral (LLAT), right-lateral (RLAT), rotational (ROT), and isotropic (ISO) geometries. To investigate the dosimetric impact of posture, the DCs of the non-standing MRCPs were compared with those of the original MRCPs (in the standing posture). The results showed that...

Source: Physics in Medicine and Biology - February 21, 2019 Category: Physics Authors: Yeom YS, Han H, Choi C, Nguyen TT, Shin B, Lee C, Kim CH Tags: Phys Med Biol Source Type: research