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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.

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Keywords

abdominal acquisition alliance annual anterior applied apply arranged assumption away back blood branch branching breath breathing complicated condition conditions considered constructed coordinate correct culture cycle deformation degrees deviation dimensional displacements distance divided dotted education effective employing engineering error errors euclidean excite expression extract extracted fast feasibility field fiesta filter focal foundation free future graduate grant growing healthy held hepatic important included inferior informatics inhomogeneity institute interleaved international interpolation isotropic japan least linear liver lock materials matrix medical medicine meeting ministry molecular motion moving national negligibly next onto operation organs original pace pixel portal positions posterior process processing projected projection proposal proposed radiological reconstruct relational respirations rotation school science sciences selected sets skeleton skeletons slice slices slow smooth smoothing sophisticated spatial spot square steady step steps structure structures successfully superior supported system table target technology thermal tissue tracked tracking transformation translational tree vain vessel vessels view volunteer