Construction of a Voxel Phantom Based on CT Data for a Japanese Female Adult and Its Use for Calculation of Organ Doses from External Electrons

Abstract

A voxel phantom for a Japanese female adult was developed from CT data. This new phantom, Onago, has a slightly larger size than the Asian Reference Man, Female (ARMF). The organ doses and effective doses for external electrons were calcu- lated with Onago in the energy range of 1 MeV through 10 GeV, and compared with those of a Japanese male voxel phantom Otoko and with those of a MIRD phantom. The organ doses show some typical tendencies which are common to all phan- toms, and the absolute values are also similar. However, in some cases the absolute values of organ doses differ greatly among the phantoms: the maximum difference observed between the voxel phantoms and the MIRD-type phantom was a factor of fifty for the individual organ dose and a factor of two for the effective dose. This suggests the necessity of sophisti- cated phantoms and detailed investigation using the phantoms to find out the realistic reference organ doses and the fluctua- tions due to different factors for external electron exposures.