Abstract #2864

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

James L. Kent¹, Ladislav Valkovic^2,3, 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

Synopsis

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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