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Abstract #3698

Motion Robust Parallel Transmission Excitation Pulse Design for Ultra-High Field MRI

Luke Watkins1, Alix Plumley1, Kevin Murphy1, and Emre Kopanoglu1
1Cardiff University Brain Research Imaging Centre, Cardiff, United Kingdom

Within-scan patient motion hampers the performance of parallel-transmit (pTx) pulses. In this study we developed a motion-robust pTx pulse (MRP) in the small tip angle regime to improve magnitude homogeneity over a range of pitch/roll/yaw rotations from 0° to 5°. The 4-spoke MRP was compared to a 3-spoke conventionally designed pulse (CDP). The MRP produced more homogenous magnitude profiles than the CDP for all evaluated rotations (0°,1°,2°,5° around each axis). The benefit of the method was more prominent with increased rotation angles. The proposed design shows potential for excitation pulses that maintain highly homogeneous magnitude profiles during patient head motion.

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