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Abstract #1420

MRF-based channel-wise absolute B1+ mapping at low RF power in the human abdomen at 7T

Max Lutz1, Christoph Stefan Aigner1, Sebastian Flassbeck2,3, Felix Krüger1, Constance G. F. Gatefait1, Tobias Schaeffter1,4,5, and Sebastian Schmitter1,6,7
1Physikalisch-Technische Bundesanstalt, Braunschweig and Berlin, Germany, 2Dept. of Radiology, Center for Biomedical Imaging, New York, NY, United States, 3Center for Advanced Imaging Innovation and Research, New York, NY, United States, 4School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, 5Department of Biomedical Engineering, Technical University of Berlin, Berlin, Germany, 6Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 7Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Synopsis

Keywords: High-Field MRI, High-Field MRI

For pTx applications, knowledge of the underlying Tx channel-wise B1+ profile is essential. In this work, we present a hybrid absolute B1+-mapping approach where MRF-based B1+-mapping is utilized to map the channel-wise absolute B1+ profile, providing higher accuracy at low flip angles than standard methods. The hybrid approach is compared to mapping each Tx channel separately using the MRF-based method. Phantom and body in-vivo measurements at 7T show good agreement between the two approaches.

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Abstract Presentation Video

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