Actively shielded bias magnetic field tuning coil for optically pumped atomic magnetometer toward direct MR signal detection in ultra-low field MRI

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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