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Abstract #3703

Rapid pre-saturated TFL transmit field mapping with an optimized 3D centric single-shot readout

Dario Bosch1, Jonas Bause1, Philipp Ehses2, Moritz Zaiss1,3, and Klaus Scheffler1,4
1High Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tuebingen, Germany, 2German Center for Neurodegenerative Diseases, Bonn, Germany, 3Department of Neuroradiology, University Hospital Erlangen, Erlangen, Germany, 4Institute for Biomedical Magnetic Resonance, University Hospital Tuebingen, Tuebingen, Germany

Robust and fast measurements of the transmit field strength is of great importance particularly in parallel transmit applications at ultra-high field. In this work, a pre-saturation TurboFLASH B1+ mapping sequence was optimized for 3-dimensional single-shot acquisition with spiral-centric reordering. Improved SNR and reduced artifacts were achieved by using a variable flip-angle readout. The ability of the proposed sampling scheme to perform fast whole-brain B1+ mapping with low SAR was demonstrated in phantom and in-vivo experiments at 9.4 T. The obtained B1+ maps were comparable to those obtained with the conventional 2D-SatTFL approach but required significantly less scan time.

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