Dynamic off-resonance magnetic field monitoring and correction using proton field probes
Ying-Hua Chu 1 , Yi-Cheng Hsu 1 , Shang-Yueh Tsai 2 , Wen-Jui Kuo 3 , and Fa-Hsuan Lin 1
Institute of Biomedical Engineering,
National Taiwan University, Taipei, Taiwan,
Chengchi University, Taipei, Taiwan,
Yang Ming University, Taipei, Taiwan
Here we develop a 10-channel field probe system using 1H
as the NMR signal source to monitor the magnetic field.
The field probe is decoupled from the subject by
interleaving the field probe measurement and subject
imaging. Specifically, field probe NMR signal was
measured at high spatial frequency k-space point in
order to minimize the NMR signal from the subject.
Empirical data showed successful monitoring of
respiratory and cardiac cycles. We can track 2D field
drifting with 0.1 s temporal resolution and use this
information to improve the time-domain SNR (tSNR) of
dynamic spiral imaging by 137 %.
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