Posture-dependent dose coefficients of mesh-type ICRP reference computational phantoms for photon external exposures
- Authors
- Yeom, Yeon Soo; Han, Haegin; Choi, Chansoo; Thang Tat Nguyen; Shine, Angho; Lee, Choonsik; Kim, Chan Hyeong
- Issue Date
- Apr-2019
- Publisher
- IOP PUBLISHING LTD
- Keywords
- reference computational phantom; mesh; posture; dose coefficient; Monte Carlo
- Citation
- PHYSICS IN MEDICINE AND BIOLOGY, v.64, no.7, pp.1 - 15
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICS IN MEDICINE AND BIOLOGY
- Volume
- 64
- Number
- 7
- Start Page
- 1
- End Page
- 15
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14250
- DOI
- 10.1088/1361-6560/ab0917
- ISSN
- 0031-9155
- 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), posteroanterior (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 organ/tissue doses are significantly influenced by posture, with arm position mostly influencing dose to organs/tissues in the torso region and leg position influencing dose in the pelvic region. For most cases, the gonads showed notably large differences, ranging from a few tens of percentage points to several orders of magnitude, depending on posture and irradiation geometry. The effective doses showed much smaller differences than the organ/tissue doses, but they were nonetheless significant: for example, the kneeling MRCPs in the AP geometry showed lower values at energies <10 MeV by up to 30% and greater values at higher energies by up to 40%. The presented results indicate that not only different irradiation geometries, but also different postures might be necessary in DC calculations for reliable dose estimates for radiological protection purposes.
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