Abstract #0526

Three-Dimensional Motion Analysis of Hepatic Tissue for Focal Spot Tracking Based on Portal Vain Structure

Etsuko Kumamoto^1,2, Yoshie Takao³, Daisuke Kokuryo⁴, Toshiya Kaihara², Kagayaki Kuroda^5,6

¹Information Science & Technology Center, Kobe University, Kobe, Japan; ²Graduate School of System Infomatics, Kobe University, Kobe, Japan; ³Graduate School of Engineering, Kobe University, Kobe, Japan; ⁴Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; ⁵Graduate School of Engineering, Tokai University, Hiratsuka, Japan; ⁶Medical Device Development Center, Foundation for Biomedical Research & Innovation, Kobe, Japan

This study was performed to extend the two-dimensional target tracking technique for MRgFUS of liver to three-dimensional. To analyze translation and deformation of a portal vein tree induced by respiration, we acquired series of multi-slice balanced SSFP images in sagittal plane of a healthy volunteers liver. The rate of the translation and deformation were different by location of branching vessels. The deformation function of the respiratory phase was defined for estimating out-plane displacement. The experimental results demonstrated the three-dimensional translate and deformation of the hepatic tissue could be measured and the estimation method of out-plane displacement will be useful for the three-dimensional target tracking technique.