Research on Modeling of Skeletal Composite Voxel Model Based on Micro-CT Image

Spongiosa in existing human voxel phantom is replaced by homogeneous model. This affects the accuracy of skeletal dosimetry calculations. At present NMR and micro-CT images of Caucasian spongiosa are used in the research of establishment and dosimetry of skeletal microscopic model internationally. But there is currently no –research on this area in China. In the present work, micro-CT images were used to establish the skeletal microscopic model based on the Chinese spongiosa. And the skeletal composite voxel model was established by combining skeletal microscopic model with macroscopic model existed in Chinese reference adult male voxel model. Preliminary calculations of electron absorbed fractions for the pelvis form trabecular bone volume, trabecular bone surface and red marrow to endosteum were carried out by using skeletal composite voxel model. The results show that the variation tendencies of electron absorbed fraction curves are accordant with the results of Caucasian. The maximum differences are 5.7%, 1.4% and 2% respectively.