MRIのためのエレベータに起因する変動磁場を低減するシャフト壁の遮蔽方法の検討

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2017/02/01

タイトル(英語): Optimal Elevator Shaft Shielding Method to Reduce Magnetic Field Fluctuations Due to Movement of Elevator for MRI

著者名: 鎌田　清孝（鹿児島工業高等専門学校 電子制御工学科），内門　大地（鹿児島工業高等専門学校 機械・電子システム工学専攻），玉利　陽三（鹿児島工業高等専門学校 情報工学科），湯ノ口　万友（鹿児島大学）

著者名(英語): Kiyotaka Kamata (National Institute of Technology, Kagoshima College), Daichi Uchikado (National Institute of Technology, Kagoshima College), Yozo Tamari (National Institute of Technology, Kagoshima College), Kazutomo Yunokuchi (Kagoshima University)

キーワード: MRI，エレベータシャフト，変動磁場，遮蔽方法　　MRI，Elevator Shaft，Magnetic Flux Density Fluctuations，Shielding Method

要約(英語): This paper describes an optimal shielding shape of elevator shafts for installations of MRI and Electron Beam Lithography System. The imaging of the MRI is mainly disturbed by the magnetic flux density fluctuations (MFDF) in the direction that the uniform flux is applied with amplitudes of 1.5 T and 3.0 T. Almost all MRIs are set horizontally, so the shielding method for the horizontal component of the MFDF was primarily investigated. A shielding shaft divided into upper and lower parts with a gap also enables the opening for going in and out from the elevator. Firstly, the MFDFs due to the movement of the elevator were measured. Then, the magnitudes and directions of the magnetic moments that can model the magnetic materials of the elevator were estimated using an inverse problem, so that the MFDFs obtained agree with those measured. Secondly, the relationship between shape of shielding shaft and the estimated fluctuations of leakage magnetic field in the horizontal and vertical directions due to the movement of the modeled elevator was investigated using a 3D finite linear magnetic-field analysis. Lastly, the optimum shape of the elevator-shielding shaft for preventing MFDFs due to the movement of the elevator was investigated by analysis.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.137 No.2 （2017） 大特集：電子・情報・システム部門誌 30周年記念「電子・情報・システム技術によるイノベーション」

本誌掲載ページ: 342-347 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/ieejeiss/137/2/137_342/_article/-char/ja/