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Abstract #3365

Rapid and Low SAR B1-Mapping Using a BURST-Based Bloch-Siegert-Shift Sequence

Alexander Gotschy1, 2, Uvo C. Hlscher3, Thomas C. Basse-Lsebrink1, 4, Andr Fischer5, Morwan Choli3, Thomas Kampf1, Volker Sturm1, Daniel Neumann3

1Department of Experimental Physics 5, University of Wrzburg, Wrzburg, Germany; 2Department of Internal Medicine I, University of Wrzburg, Wrzburg, Germany; 3Research Center Magnetic Resonance Bavaria (MRB), Wrzburg, Germany; 4Department of Neurology, University of Wrzburg, Wrzburg, Germany; 5Institute of Radiology, University of Wrzburg, Wrzburg, Germany

An accurate knowledge of the B1+-field distribution becomes increasingly important for many MR applications like B1+ shimming, Spatially Selective Excitation algorithms or guaranteeing patient safety at ultrahigh fields. To meet the requirements of high field applications we used the lately introduced Bloch-Siegert-Shift based B1+-mapping method in a BURST sequence. The new sequence combines robustness against T2* effects with reduced SAR. In the presented study we found that a centric encoded BS-BURST sequence allows highly accelerated B1+-mapping with superior quality. The B1+ map of a whole head could be acquired in 36s which is adequate for applications in clinical routine.