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Abstract #0526

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

Etsuko Kumamoto1,2, Yoshie Takao3, Daisuke Kokuryo4, Toshiya Kaihara2, Kagayaki Kuroda5,6

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.