DEVELOPMENT OF FEMALE ATOM-MIRD HYBRID VOXEL MODEL FOR MONTE CARLO DOSIMETRY CALCULATIONS

Abstract

Purpose: The objective of the present study is to construct a female computational phantom that combines the tomographic model of the ATOM adult female physical phantom with the organ models of the MIRD5 mathematical phantom. Methods and Materials: The ATOM adult female phantom was scanned with a CT scanner. Then, the acquired images were taken at 1.5 mm interval and segmented for air, skeleton, lungs, and soft tissue. Transverse images of the MIRD5 mathematical phantom were also obtained at the same interval. The hybrid voxel model was finally constructed by combining the segmented images of the ATOM physical phantom and the transverse images of the MIRD5 mathematical phantom. Results: The organs of the MIRD5 mathematical model were successfully transferred to the hybrid model, replicating the dimensions of the organs within a few %. Fourteen radiosensitive organs were defined in the female model. The developed model showed very reasonable values for the organ doses when compared with other models in the literature. Conclusions: The developed hybrid model can be used to calculate the organ doses of the ATOM adult female phantom.