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要旨:
In this work, we demonstrate B1 phase shimming in situ at 9.4 Tesla: A rapid calibration pre-scan provides B1+ magnitude and phase maps that are used to predict the total field across the subject dependent on a phase configuration of choice. In addition, a GUI provides the option to select a region within a slice where the field is quickly and reliably optimized by a simulated annealing algorithm based on a suitable optimization criterion. The accuracy of this method is demonstrated in a saline phantom and used for B1 shimming in the human brain.
