Deformable and Posture-Changeable Computational Phantoms and Dosimetry Data for Standard External-Beam Irradiations

摘要

For many radiation dosimetry studies, whole-body phantoms representing workers and patients are used to perform Monte Carlo calculations of organ doses. Since the 1960s, approximately 121 computational phantoms have been reported in the literatures for studies involving ionizing and non-ionizing radiations [1]. There is a barrier currently in developing and in applying person-specific phantoms that are anatomically different from the ICRP reference individuals. We recently adopted the novel-surface modeling method to systematically design a set of pregnant female phantoms by manual work. Now, the automatically algorithm has been systematically developed to develop computational human phantom by all mesh-based organ files. Using this approach we have now developed a pair of mesh-based adult phantoms, RPI-AM and RPI-AF, representing ICRP 89 50th- percentile adult males and adult females. A software has also been developed to develop the phantoms representing different percentile populations and different postures based on this pair of phantoms. The absorbed organ dose results for the external photon exposures using this pair of phantoms were calculated and compared with the ICRP Phantoms. These results demonstrated that, although both sets of phantoms have the same organ volumes and masses, the anatomical differences can cause to dosimetry differences in terms of the effective doses as well as organ absorbed doses. The posture-changing ability has potential applications in many areas of radiation dosimetry.