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Abstract #2924

Sodium B 1 mapping at 9.4 T

Christian C. Mirkes 1,2 , G. Shajan 1 , Jens Hoffmann 1 , Daniel Brenner 3 , Rolf Pohmann 1 , and Klaus Scheffler 1,2

1 High-Field MR Center, Max Planck Institute for Biological Cybernetics, Tbingen, BW, Germany, 2 Department for Biomedical Magnetic Resonance, University of Tbingen, Tbingen, BW, Germany, 3 MR Physics, German Center for Neurodegenerative Diseases (DZNE), Bonn, NRW, Germany

Accurate sodium B 1 field mapping is a key requirement for quantitative sodium imaging at ultra-high field strength. In this study the performance of three B 1 mapping techniques was evaluated in a phantom at 9.4 T. Compared to the double angle and the Bloch-Siegert shift based methods, the phase sensitive method provided the most reliable maps, especially in regions of weak B 1 .

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