Percentile-specific computational phantoms constructed from ICRP mesh-type reference computational phantoms (MRCPs)

Abstract

Recently, the Task Group 103 of the International Commission on Radiological Protection (ICRP) has developed new mesh-type reference computational phantoms (MRCPs) for adult male and female. When compared to the current voxel-type reference computational phantoms in ICRP Publication 110, the MRCPs have several advantages, including deformability which makes it possible to create phantoms in different body sizes or postures. In the present study, the MRCPs were deformed to produce a set of percentile-specific phantoms representing the 10 th , 50 th , and 90 th percentiles of standing height and body weight in Caucasian population. For this, anthropometric parameters for the percentile-specific phantoms were first derived from the anthropometric software and survey data. Then, the MRCPs were modified to match the derived anthropometric parameters. For this, first, the MRCPs were scaled in the axial direction to match the head height, torso length, and leg length. Then, the head, torso, and legs were scaled in the transversal directions to match the lean body mass for the percentilespecific phantoms. Finally, the scaled phantoms were manually adjusted to match the body weight and the remaining anthropometric parameters (upper arm, waist, buttock, thigh, and calf circumferences and sagittal abdominal diameter). The constructed percentile-specific phantoms and the MRCPs were implemented into the Geant4 Monte Carlo code to calculate organ doses for a cesium-137 contaminated floor. The results showed that organ doses of the 50 th percentile (both standing height and body weight) phantoms are very close to those of the MRCPs. There were noticeable differences in organ doses, however, for the 10 th and 90 th percentile phantoms when compared with those of the MRCPs. The results of the present study confirm the general intuition that a small person receives higher doses than a large person when exposed to a static radiation field, and organs closer to the source receive higher doses.

PARaDIM: A PHITS-Based Monte Carlo Tool for Internal Dosimetry with Tetrahedral Mesh Computational Phantoms

“…For all simulations, PARaDIM uses tetrahedral mesh-type computational phantoms (14)(15)(16)(17)(18)(19). Yeom et al (18) provide a detailed discussion of computation speeds and memory requirements of this phantom format relative to voxel phantoms.…”

Development of a novel program for conversion from tetrahedral‐mesh‐based phantoms to DICOM dataset for radiation treatment planning: TET2DICOM

“…It can be used for MRKP/MRCP, which are used for performance verification, and for various types of recently developed TM phantoms. 34,35 Moreover,a TM phantom in various postures was successfully applied to the TPS. It is expected that TET2DICOM will prove effective in producing DICOM datasets for phantoms in various postures and that it will henceforward be well implemented to consider various patients' somatotypes and postures in treatment planning.…”

Technical Note: Patient‐morphed mesh‐type phantoms to support personalized nuclear medicine dosimetry — a proof of concept study

“…Selecting an initial phantom that already closely reflects patient body habitus and positioning would reduce computational overhead as well as the magnitude of potential error due to reduced deformation required. Comprehensive libraries of such phantoms are currently available, including a recently developed percentile-specific phantom series (20phantoms) 18 and the UF/NCI phantom series (>400 phantoms). 19 The specific deformable registration method utilized should be considered an implementation detail.…”