光ポンピング原子磁気センサを用いたMR信号検出のための磁場分布解析
光ポンピング原子磁気センサを用いたMR信号検出のための磁場分布解析
カテゴリ: 論文誌(論文単位)
グループ名: 【A】基礎・材料・共通部門
発行日: 2012/03/01
タイトル(英語): Analyses of Magnetic Field Distributions for the Measurement of Magnetic Resonance Signals using Optically Pumped Atomic Magnetometers
著者名: 土田 昌宏(京都大学大学院工学研究科電気工学専攻生体機能工学分野),笈田 武範(京都大学大学院工学研究科電気工学専攻生体機能工学分野),小林 哲生(京都大学大学院工学研究科電気工学専攻生体機能工学分野)
著者名(英語): Masahiro Tsuchida (Graduate School of Engineering, Kyoto University), Takenori Oida (Graduate School of Engineering, Kyoto University), Tetsuo Kobayashi (Graduate School of Engineering, Kyoto University)
キーワード: 超低磁場MRI,光ポンピング,原子磁気センサ,フェライトシールド ultra-low field (ULF) MRI,optically pumping,atomic magnetometer,ferrite shield
要約(英語): In ultra-low field MRI with optically pumped atomic magnetometer (OPAM), it is required for the direct detection of MR signals with high sensitivity to match the resonant frequency of potassium to that of proton. A ferrite shield box, which has high-permeability and high electric resistance, is able to be utilized to match the resonant frequencies. In this study, analyses of magnetic field distributions in the vicinities of sample and potassium vapor cell of OPAM were carried out. In addition, the uniformities of the magnetic fields in the areas of sample and potassium vapor cell of OPAM and the magnetic field caused by MR signals were evaluated. These analyses indicated that the resonant frequencies of proton and potassium were matched by using the ferrite shield box with a number of combinations of height and thickness. The uniformities of the magnetic fields applied to a sample were found to be improved by placing the ferrite shield box far from the sample. Furthermore, regardless of the height, the magnetic field caused by MR signals was able to be measured.
本誌: 電気学会論文誌A(基礎・材料・共通部門誌) Vol.132 No.3 (2012) 特集:平成23 年基礎・材料・共通部門大会
本誌掲載ページ: 220-226 p
原稿種別: 論文/日本語
電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/132/3/132_3_220/_article/-char/ja/
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