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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