B1 mapping is important to characterize non-uniform coil geometries and to optimize imaging sequences and image reconstructions in low-field MRI, but is made challenging by point-of-care single-sided imaging geometries with large frequency bandwidths and B1 ranges. We propose a high-bandwidth phase-based B1 mapping technique based on a CHORUS pulse sequence with alternated frequency sweep polarities, which has a wide (40 kHz) imaging bandwidth and high B1 dynamic range. The sequence was implemented and validated on a 65 mT single-sided prostate MRI scanner in phantom scans with butterfly coil transmit and local multichannel receive.
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