Optimized ultrahigh field parallel transmission workflow using rapid presaturated TurboFLASH transmit field mapping with a three-dimensional centric single-shot readout

Purpose To evaluate the usage of three-dimensional (3D) presaturated TurboFLASH (satTFL) for B1+$$ {\mathrm{B}}_1<^>{+} $$ and B0$$ {\mathrm{B}}_0 $$ mapping on single channel and parallel transmission (pTx) systems. Methods B1+$$ {\mathrm{B}}_1<^>{+} $$ maps recorded with 3D satTFL were compared to maps from three other 3D B1+$$ {\mathrm{B}}_1<^>{+} $$ mapping sequences in an agar phantom. Furthermore, individual-channel B1+$$ {\mathrm{B}}_1<^>{+} $$ maps of 18 human subjects were recorded with 3D satTFL using B1+$$ {\mathrm{B}}_1<^>{+} $$ interferometry. A neural network was trained for masking of the maps. Results Out of the sequences compared satTFL was the only one with a mapping range exceeding well over 90 degrees. In regions with lower flip angles there was high correspondence between satTFL and AFI. DREAM and double angle method also showed high qualitative similarity, however the magnitude differed from the other two measurements. The individual-channel B1+$$ {\mathrm{B}}_1<^>{+} $$ maps were successfully used for pTx pulse calculation in a separate study. Conclusion 3D satTFL can record high-quality B1+$$ {\mathrm{B}}_1<^>{+} $$ maps with a high dynamic range in a short time. Correspondence with AFI maps is high, while measurement duration is reduced drastically.