It has been shown recently that parallel transmission universal pulses (UPs), optimized offline on a training field-maps database, can be used to robustly mitigate B1+ inhomogeneity on other subjects, thus holding great potential for spreading their utility by sparing the user the time-consuming individualized calibration. For these UPs to be used widely, however their performance needs to be immune to inter-site differences. In this study, we examined the robustness of the UPs against inter-site variability. Our results so far obtained at two sites show that the UPs are quite robust in producing uniform contrast across the brain despite these differences.
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