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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