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

Saito, Kimiaki  ; Koga, Sukehiko*; Ida, Yoshihiro*; Kamei, Tetsuya*; Funabiki, Jun*

A voxel phantom for a Japanese female adult was developed according to CT data. The developed phantom Onago has a slightly larger size than the Asian Reference Man, Female (ARMF). The organ doses and effective doses for external electrons were calculated with the developed phantom in the energy range of 1 MeV through 10 GeV, and compared with those for a Japanese male voxel phantom Otoko and with those for a MIRD phantom. The organ doses show some typical tendencies which are common for all phantoms, but in some cases the absolute values of organ doses differ largely according to phantom. 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 sophisticated phantoms and detailed investigation using the phantoms to find out the realistic reference organ doses and the fluctuations for external electron exposures.