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Abstract #3951

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

Luke Watkins1, Alix Plumley2, Kevin Murphy1, and Emre Kopanoglu2
1Department of Physics and Astronomy, CUBRIC, Cardiff University, Cardiff, United Kingdom, 2Department of Psychology, CUBRIC, Cardiff University, Cardiff, United Kingdom

Within-scan patient motion reduces PTx pulse performance. A motion-robust PTx 5-spoke pulse (MRP) was designed using simulated B1 maps at multiple head positions, and was compared to a conventional 3-spoke reference pulse. For a 5° rotated head orientation, magnitude nRMSE was reduced from 14% to 5.4%, phase RMSE from 17° to 3.6°, maximum magnitude and phase errors from 64% to 20% and 68° to 15° respectively. Although a longer pulse duration, the MRP maintained similar magnitude nRMSE to the reference pulse at the centre, and superior performance in 97% of all four error metrics for 46 off-centre positions.

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