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Abstract #0660

Respiration-Resolved 3D Multi-Channel B1 mapping of the body at 7T

Sebastian Dietrich1, Christoph Stefan Aigner1, Juliane Ludwig1, Johannes Mayer1, Simon Schmidt2, Christoph Kolbitsch1,3, Tobias Schaeffter1,3, and Sebastian Schmitter1,2
1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany, 2Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 3Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom

A major challenge of ultra-high field MRI is the spatially inhomogeneous transmit radio frequency field that induces spatial contrast variations. In this work we present a novel technique to retrieve channel-wise, motion-resolved absolute 3D FA maps of the human body at 7T. Free breathing 3D scans of the thorax were performed and B1 maps without motion artifacts are obtained for the two motion states inhale and exhale. It allows acquiring B1 libraries that can be used for offline RF pulse calculation including motion-robust RF pulses.

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