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a Amplitude and b phase transmit B1 maps of individual surface coils of the 8-channel transceiver array. c Axial images demonstrating corresponding ROIAmp and ROIPhase used in the RF shimming procedure for subjects #1 (c) and #2 (d). e B1 map of the same slice shown in c obtained after RF shimming. Amplitude B1 map in e is presented in kHz. The B1 map images were acquired at 64 × 64 resolution over a field of view (FOV) of 192 × 192 mm2 using a 2 mm slice thickness
