Detecting rotating magnetic fields using optically pumped atomic magnetometers for measuring ultra-low-field magnetic resonance signals

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• 作者：Takenori Oida^a ; ^{oida@kuee.kyoto-u.ac.jp} ; Yosuke Ito^b ; ^a ; Keigo Kamada^a ; Tetsuo Kobayashi^a
• 关键词：Optically pumped atomic magnetometer ; Rotating-magnetic-field measurement ; Magnetic resonance imaging
• 刊名：Journal of Magnetic Resonance
• 出版年：2012
• 期刊代码：126_10907807
• 类别：ch
• 出版时间：April, 2012
• 卷：217
• 期：Complete
• 页码：6-9
• 文件大小：563 K

摘要

In this paper, we describe the detection of rotating magnetic fields using optically pumped atomic magnetometers (OPAMs) for measuring magnetic resonance (MR) signals. From the results of rotating- and alternating-magnetic-field measurements, we found that to detect a rotating magnetic field with high sensitivity, the rotation direction of the magnetic field to be measured must select the bias-magnetic-field direction of OPAM. In addition, the OPAM sensitivity for rotating magnetic fields should be twice that for alternating magnetic fields. These results indicate that for measuring MR signals, magnetic fields caused by rotating magnetizations can be detected with the sensitivity of order at 1 kHz using OPAMs.