title: COMPARISON OF ORGAN DOSES IN HUMAN PHANTOMS: VARIATIONS DUE TO BODY SIZE AND POSTURE.
abstract: Organ dose calculations performed using human phantoms can provide estimates of astronauts' health risks due to cosmic radiation. However, the characteristics of such phantoms strongly affect the estimation precision. To investigate organ dose variations with body size and posture in human phantoms, a non-uniform rational B-spline boundary surfaces model was constructed based on cryosection images. This model was used to establish four phantoms with different body size and posture parameters, whose organs parameters were changed simultaneously and which were voxelised with 4 × 4 × 4 mm3 resolution. Then, using Monte Carlo transport code, the organ doses caused by ≤500 MeV isotropic incident protons were calculated. The dose variations due to body size differences within a certain range were negligible, and the doses received in crouching and standing-up postures were similar. Therefore, a standard Chinese phantom could be established, and posture changes cannot effectively protect astronauts during solar particle events.
authors.affiliation: Beijing University of Aeronautics and Astronautics, School of Aeronautic Science and Engineering, Beijing 100191, China.|China Astronaut Research and Training Center, State Key Laboratory of Space Medicine Fundamentals and Application, Beijing 100094, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Feng
authors.affiliation: China Astronaut Research and Training Center, State Key Laboratory of Space Medicine Fundamentals and Application, Beijing 100094, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Xiang-Hong
authors.affiliation: Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Qian
authors.affiliation: China Astronaut Research and Training Center, State Key Laboratory of Space Medicine Fundamentals and Application, Beijing 100094, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Xue-Jun
authors.affiliation: China Astronaut Research and Training Center, State Key Laboratory of Space Medicine Fundamentals and Application, Beijing 100094, China.
authors.forename: Pan
authors.initials: P
authors.lastname: Zhan-Chun
authors.affiliation: Beijing University of Aeronautics and Astronautics, School of Aeronautic Science and Engineering, Beijing 100191, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Chun-Xin
mesh_terms: D018480:Astronauts; D049628:Body Size; D006801:Humans; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011187:Posture; D011829:Radiation Dosage; D000069079:Radiation Exposure