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Sato, Kaoru; Noguchi, Hiroshi; Emoto, Yutaka*; Koga, Sukehiko*; Saito, Kimiaki
Radiation Protection Dosimetry, 123(3), p.337 - 344, 2007/02
Times Cited Count：39 Percentile：91.33(Environmental Sciences)A Japanese adult male voxel (volume pixel) phantom (hereinafter referred to as the JM phantom) was constructed on the basis of CT images of a healthy Japanese adult male volunteer. Body characteristics of the JM phantom were compared with those of a voxelized MIRD5 type phantom and a Japanese adult male voxel phantom which was previously developed. The voxel size of the JM phantom is 0.98
0.981 mm
. The shapes of organs of the JM phantom, even for small or complicated organs, such as thyroid and stomach, are more realistically reproduced as compared with the previous Japanese voxel phantom (voxel size: 0.980.9810 mm). Photon self-absorbed fractions for brain, kidneys, spleen, pancreas, thyroid and urinary bladder wall of JM were evaluated and were compared with those of the other phantoms. In consequence, it was suggested that the mass, shape and thickness of organs are important factors for the determination of self-absorbed fractions.
Sato, Kaoru; Furuta, Takuya
no journal, ,
In retrospective evaluation of exposure doses and risks, it is necessary to consider the individual differences in physiques and organ geometries in addition to exposure conditions. The presenters are now developing deformation functions of the physiques and organ shapes of the adult Japanese male polygon phantom (JPM) for purposes of the retrospective evaluation for individuals. The newly developed deformation functions are as follows: (1) dividing organs of JPM into "Units" composed of several organs based on anatomical information, (2) deforming each "Unit" by using Lattice method, (3) creating "Joint model" by combining the deformed "Units", and (4) reproducing the continuous shape changes of the organs by applying Morph method to "Joint models". The above process made it possible to deform the JPM without generating polygon intersections. The deformed JPM was applicable to the tetrahedralization and radiation transport simulation.
