Despite its power to mitigate B1+-inhomogeneity, subject-specific tailored parallel transmission (pTx) suffers from a cumbersome workflow involving measurement of field maps as well as online pulse design. Recently however, it was shown that RF inhomogeneity-mitigating (universal) pulses could be found offline to work robustly over a given B1+ maps-database, thus potentially sparing the user the time-consuming calibration. To gain further performance with improved database matching for universal pulses, in this work we investigate with electromagnetic simulations the intersubject B1+ map variability by systematically varying position (in Z and Y), head length and head breadth of a reference head model.
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