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Abstract #2864

Acceleration Methods to Acquire Fast 3D Multi-Channel Absolute B1+ Maps at 7T for 8-Channel pTx

James L. Kent1, Ladislav Valkovic2,3, Iulius Dragonu4, and Aaron T. Hess1
1Wellcome Centre for Integrative Neuroimaging, FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom, 2Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, Oxford, United Kingdom, 3Department of Imaging Methods, Institute of Measurement Science, Slovak Academy of Sciences, Bratislava, Slovakia, 4Siemens Healthineers, Frimley, United Kingdom


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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