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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