Ultra-high field MRI with parallel transmit offers significant advantages but B1 transmit maps must be acquired to utilize its full potential. Acquiring absolute B1+ maps for each channel is a time-consuming process and limits the application of UHF to clinical practice. We compare two methods of accelerating the transmit mapping procedure to obtain fast volumetric multi-channel maps for an 8-channel transmit array. Both methods make use of a low-rank reconstruction (TxLR) from undersampled data and a modified pre-saturation TurboFLASH (satTFL) B1+ mapping sequence in combination with either Fourier encoding or a B1TIAMO style acquisition.
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