Ultra-high field MRI with parallel transmit offers significant advantages but B1+ maps are required to utilize its potential. Acquiring B1+ maps for each channel is time-consuming and limits the application of ultra-high field in clinical practice. In this abstract we present an approach to acquire full 3D multi-channel B1+ maps in 11 seconds. We do this by employing a time-interleaved acquisition of modes strategy using undersampled relative maps and two fast undersampled Sandwich B1+ maps all reconstructed using TxLR, a calibrationless reconstruction for transmit field maps. We demonstrate this approach with simulations and scans in phantom and in the brain.
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Kent et al. (2024) studied this question.
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