Actively shielded bias magnetic field tuning coil for optically pumped atomic magnetometer toward direct MR signal detection in ultra-low field MRI
Takenori Oida 1 , Masahiro Tsuchida 1 , and Tetsuo Kobayashi 1
Department of Electrical Engineering,
Graduate School of Engineering, Kyoto University, Kyoto,
Recently, optically pumped atomic magnetometers (OPAMs)
have been developed and allow us easily to measure
extremely small magnetic fields. An ultra-low field
(ULF) MRI system with an OPAM has been attracted
attentions in recent years. In this study, we proposed
an actively shielded bias magnetic field tuning coil
toward direct detection of MR signals with an OPAM.
Results of magnetic field distribution analyses
demonstrated that the active shield could reduce the
magnetic distortion caused by the bias tuning coil and
the actively shielded bias magnetic field tuning coil
was feasible to detect MR signals directly with an OPAM.
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