Keywords: RF Pulse Design & Fields, RF Pulse Design & Fields
Motivation: Dynamic RF shimming in pTX at UHF faces two limitations: lengthy computational time of the GRAPE method or lack of precision of parametric approaches (e.g. kT-points).
Goal(s): To validate an alternative pulse parameterization, fastGRAPE, potentially offering a better trade-off between the performance and computational speed.
Approach: We compare GRAPE, fastGRAPE, and kT-point online and offline pulse designs for a commercial and a custom pTX RF coils at 7T using Bloch simulation and in vivo acquisitions.
Results: For short STA excitation, fastGRAPE yields comparable performances to GRAPE and outperforms kT-points. For inversion with the custom coil, online fastGRAPE provides the best flip angle accuracy.
Impact: With a flip angle accuracy comparable to GRAPE and a computation time comparable to kT-points, fastGRAPE presents a promising strategy both for online and offline dynamic RF shimming.
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