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Abstract #1577

Three-Dimensional Focal Spot Tracking Based on Portal Vain Tree Structure

Etsuko Kumamoto1, 2, Syuhei Iwaoka2, Yoshie Takao3, Daisuke Kokuryo4, Toshiya Kaihara2, Kagayaki Kuroda5, 6

1Information Technology and Science Center, Kobe University, Kobe, Hyogo, Japan; 2Graduate School of System Informatics, Kobe University, Kobe, Hyogo, Japan; 3Graduate School of Engineering, Kobe University, Kobe, Hyogo, Japan; 4Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan; 5Graduate School of Engineering, Tokai University, Hiratsuka, Japan; 6Foundation for Kobe International Medical Alliance, Kobe, Hyogo, Japan

In this study, we proposed two three-dimensional target tracking techniques for MRgFUS of liver. One method was based on a triangular pyramid constructed with a part of branching vessel and a target. The other method projected vertexes of the triangular pyramid onto each axis for single-dimensional tracking. We acquired series of multi-slice balanced SSFP images in sagittal plane of a healthy volunteerfs liver under slow pace respirations and reconstructed isotropic voxel images for ease to extract a branching vessel for interest. The experimental results demonstrate feasibility of three-dimensional tracking based on portal vain tree structure.