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Abstract #0551

Ultra-fast inner volume excitations with parallel transmission at 7 Tesla using fully optimized B0-robust k-space trajectories

Mathias Davids 1,2 , Bastien Gurin 2 , Lawrence L. Wald 2,3 , and Lothar R. Schad 1

1 Computer Assisted Clinical Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, BW, Germany, 2 Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 3 Harvard-MIT Division of Health Sciences Technology, Cambridge, MA, United States

Three-dimensional spatially selective excitations remain difficult due to limitations of the pulse duration and off-resonance induced distortions, especially at high-field strengths. It is shown that the shape optimization of k-space trajectory increases the achieved flip angle accuracy substantially while maintaining acceptable pulse durations (less than 8 ms). In particular, the incorporation of off-resonance robustness constraints within the optimization creates trajectories with an optimal tradeoff between pulse duration, excitation fidelity, and off-resonance robustness. The impact is evaluated based on simulations as well as preliminary experimental data acquired using an 8-channel parallel transmit system at 7 Tesla.

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