An ICRP-based Chinese adult male voxel model and its absorbed dose for idealized photon exposures--the skeleton.
A site-specific skeleton voxel model for a Chinese adult male was constructed in this paper upon a previous Chinese individual voxel model. The whole skeleton was divided into 19 site-specific bones and bone groups; the mass of various skeleton tissues at each bone site, e.g. red bone marrow, was specified according to Asian reference data and the distribution data from ICRP Publication 70. The resultant voxel model (called CAM) has a resolution of 1.741 mm x 1.741 mm in plane, and the total bone mass is 8397.8 g which is almost equal to the Asian reference value. Dose coefficients for the red bone marrow and bone surface in CAM were calculated, and then compared with those from Rex, CMP and ICRP 74. It shows that the dose to RBM in Rex is generally 12% lower than that to CAM in low-energy range (30-150 keV) for AP, LAT, ROT and ISO geometries. It is also found that the RBM dose from mathematical models, i.e. CMP and ICRP 74, is underestimated by -30% in AP geometry and overestimated by 30% in PA geometry for low-energy photons. Meanwhile, the bone surface dose in the low-energy range is overestimated by 150% and 75% in CMP and ICRP 74, respectively, if compared with that from CAM.
Department of Engineering Physics, Tsinghua University, Beijing, People's Republic of China.
Liye
L
Liu
Zhi
Z
Zeng
Junli
J
Li
Binquan
B
Zhang
Rui
R
Qiu
Jizeng
J
Ma
D000328:Adult; D001842:Bone and Bones / Q000528:radiation effects*; D002681:China; D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D005006:Ethnicity; D006801:Humans; D008297:Male; D008953:Models, Anatomic; D015233:Models, Statistical; D008962:Models, Theoretical; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D017785:Photons; D012016:Reference Values