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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