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Abstract #1647

Analysis of Respiratory-induced 3D Deformation of Liver based on Branching Structure of Portal Vein obtained with Time-resolved Volume Acquisitions

Etsuko Kumamoto 1 , Tastuhiko Matsumoto 2 , Daisuke Kokuryo 3 , and Kagayaki Kuroda 4,5

1 Information Science and Technology Center, Kobe University, Kobe, Hyogo, Japan, 2 Graduate School of System Informatics, Kobe University, Kobe, Hyogo, Japan, 3 Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan, 4 Graduate School of Engineering, Tokai University, Hiratsuka, Kanagawa, Japan, 5 Center for Frontier Medical Engineering, Chiba University, Chiba, Japan

3D deformation of the liver under slow breathing was analyzed on the basis of the branching structure of the portal veins. A series of sagittal, multi-slice fast steady-state (FIESTA) images was acquired from a healthy volunteerfs liver under slow-paced free respiration and was reconstructed to 4D MR images based on diaphragm positions. Regions of interest, including branching vessels, were set and tracked with the 3D template matching method. The extracted branching vessels showed that the anterior tissue of the liver was extended, and the posterior tissue of the liver was contracted against the superior tissue of the liver, which was compressed as the diaphragm fell.

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