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Abstract #0947

pTX Spoke RF Pulses for Cardiac MRI at 7T: a New Design Robust against Respiration Induced Errors, based on a Virtual Simultaneous Exhale-and-Inhale Calilbration Scan

Sebastian Schmitter 1 , Xiaoping Wu 1 , Kamil Ugurbil 1 , and Pierre-Francois van de Moortele 1

1 Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Cardiac MRI at ultra-high fields is challenged by the short RF wavelength that induces flip-angle variations. We have addressed this problem successfully in 7T cardiac CINE imaging using parallel transmission (pTX) with 2-spoke RF pulses. Sometimes, however, we observed deviations from our expectations. We suspected, that the subjects respiratory state during cardiac CINE breath-hold scans is different than during transmit B1 calibration scans (also breath-hold). Here we investigate the impact of breath-hold position on 7T cardiac CINE imaging using 2-spoke pTX pulses and demonstrate a pulse design strategy to increase the robustness of spoke pulses to variations in breath-hold position.

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