水 励 起 高 速 三 次 元 拡 散 強 調 MRIパルスシーケンスの 開 Title 発 とラット 骨 盤 部 への 生 体 応 用 沼 野, 智 一, 本 間, 一 弘, 岩 崎, 信 明, 兵 頭, 行 志, Author(s) 新 田, 尚 隆 Citation 日 本 磁 気 共 鳴 医 学 会 雑 誌, 28(3): 185-195 Issue Date 2008-07-15 URL http://hdl.handle.net/10748/5908 DOI Rights Type Journal Article Textversion author http://www.tmu.ac.jp/ 首 都 大 学 東 京 機 関 リポジトリ

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Fig.1 Vector representation of the magnetization behavior during a DEFT sequence. Fig.2 a: Diagram of the 3D MP-RAGE pulse sequence modified for diffusion imaging (3D-DWI). The FatSat-3D-DWl performs the area of a dashed line. b: The WE-3D-DWI is performed by choosing a binominal[1:1 or 1:2:1] pulse of RAGE sequence. Fig.3 Vector representation of the magnetization behavior during a binominal[1:2:1] pulse train. Fig.4 Phantom experiment results of different fat-saturation methods. A solid line is water phantom profile, and a dash line is oil phantom profile. Fig.5 Relation between the density of acetone and measured diffusion coefficient by 3D-DWI, FatSat-3D-DWI and WE-3D-DWI. Fig.6 a: T2-weighted FSE, 3D-DWI and WE-3D-DWI images of the rat pelvis. The fat tissue of WE-3D-DWI images was not displayed by fat-saturation (water-excitation) effect. b: 3D-DWI images obtained with b-value of 0, 1000 s/mm2 and the corresponding map of the calculated ADC-map of rat

pelvis. c: WE-3D-DWI images obtained with b-value of 0, 1000 s/mm2 and the corresponding map of the calculated ADC-map of rat pelvis. Fig.7 a: Collected echo peaks (the first 32 echoes of shooting) versus RAGE-loop (only the readout gradient was applied) of the FatSat-3D-DWI and WE[1-2-1]3D-DWI. b: The contrast which becomes dominant with the acquisition ordering of k-space. An arrow indicates the order of the data with which it is filled up into k-space, and coloring indicates the image contrast that become dominant.