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Abstract #1452

Optimization of fast k-space trajectories for 3D spatially selective parallel excitations

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

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 and Technology, Cambridge, MA, United States

The k-space trajectory, in addition to the RF, possesses powerful degrees of freedom to enhance 3D parallel selective excitations. A novel approach on rapidly designing arbitrarily shaped time-optimal trajectories was used to simultaneously optimize the trajectory and RF pulse. The trajectory was defined by shape parameters that were optimized for a cubic ROI and brain only excitation. Two trajectories were optimized a 3D Cross and a 3D Concentric Shells trajectory with durations of less than 7 ms each. The excitation RMSE could be reduced by up to 60% in an eight channel 7T setup, yielding applicable 3D selective excitation pulses.

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