An accurate and fast sampling method was developed on the modeling of a voxel phantom called RadHUMAN for radiation protection of MC-based radiation transport and simulation.The segmented organ voxels,which were assig...An accurate and fast sampling method was developed on the modeling of a voxel phantom called RadHUMAN for radiation protection of MC-based radiation transport and simulation.The segmented organ voxels,which were assigned with three dimensional(3D) coordinates,were simplified through a two-step hybrid sampling algorithm.Firstly,certain voxels were sampled into a coordinate matrix by the nearest neighbor sampling.Secondly,the coordinate matrix was renewed using a weighted sampling.To compare visualization with the sampling,the resultant matrix was used to extract the contour of organs/tissues for constructing polygon-surface phantom.The feasibility and effectiveness of the sampling method was vcriiied through the modeling of large organs(e.g.skeleton system) and application of transformation to MC computational geometries.展开更多
The specific absorbed fractions（SAF） for self- and cross-irradiation are effective tools for the internal dose estimation of inhalation and ingestion intakes of radionuclides. A set of SAFs of photons and electrons ...The specific absorbed fractions（SAF） for self- and cross-irradiation are effective tools for the internal dose estimation of inhalation and ingestion intakes of radionuclides. A set of SAFs of photons and electrons were calculated using the Rad-HUMAN phantom, which is a computational voxel phantom of a Chinese adult female that was created using the color photographic image of the Chinese Visible Human（CVH） data set by the FDS Team. The model can represent most Chinese adult female anatomical characteristics and can be taken as an individual phantom to investigate the difference of internal dose with Caucasians. In this study, the emission of mono-energetic photons and electrons of 10 ke V to 4 Me V energy were calculated using the Monte Carlo particle transport calculation code MCNP. Results were compared with the values from ICRP reference and ORNL models. The results showed that SAF from the Rad-HUMAN have similar trends but are larger than those from the other two models. The differences were due to the racial and anatomical differences in organ mass and inter-organ distance. The SAFs based on the Rad-HUMAN phantom provide an accurate and reliable data for internal radiation dose calculations for Chinese females.展开更多
基金Supported by National Special Program for ITER(No.2011GB113006)Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA03040000)+2 种基金National Natural Science Foundation of China(No.91026004)the Knowledge Innovation Projects of Chinese Academy of Sciences(No.095CF2R211)the Key Foundation for Young Talents in College of Anhui Province(No.2013SQRL063ZD)
文摘An accurate and fast sampling method was developed on the modeling of a voxel phantom called RadHUMAN for radiation protection of MC-based radiation transport and simulation.The segmented organ voxels,which were assigned with three dimensional(3D) coordinates,were simplified through a two-step hybrid sampling algorithm.Firstly,certain voxels were sampled into a coordinate matrix by the nearest neighbor sampling.Secondly,the coordinate matrix was renewed using a weighted sampling.To compare visualization with the sampling,the resultant matrix was used to extract the contour of organs/tissues for constructing polygon-surface phantom.The feasibility and effectiveness of the sampling method was vcriiied through the modeling of large organs(e.g.skeleton system) and application of transformation to MC computational geometries.
基金Supported by Strategic Priority Research Program of Chinese Academy of Sciences(XDA03040000)National Natural Science Foundation of China(910266004,11305205,11305203)National Special Program for ITER(2014GB112001)
文摘The specific absorbed fractions（SAF） for self- and cross-irradiation are effective tools for the internal dose estimation of inhalation and ingestion intakes of radionuclides. A set of SAFs of photons and electrons were calculated using the Rad-HUMAN phantom, which is a computational voxel phantom of a Chinese adult female that was created using the color photographic image of the Chinese Visible Human（CVH） data set by the FDS Team. The model can represent most Chinese adult female anatomical characteristics and can be taken as an individual phantom to investigate the difference of internal dose with Caucasians. In this study, the emission of mono-energetic photons and electrons of 10 ke V to 4 Me V energy were calculated using the Monte Carlo particle transport calculation code MCNP. Results were compared with the values from ICRP reference and ORNL models. The results showed that SAF from the Rad-HUMAN have similar trends but are larger than those from the other two models. The differences were due to the racial and anatomical differences in organ mass and inter-organ distance. The SAFs based on the Rad-HUMAN phantom provide an accurate and reliable data for internal radiation dose calculations for Chinese females.
