To exploit acceleration potential of Bloch-Siegert shift based $$$B_1^+$$$-mapping, we implemented a 3D segmented EPI sequence with variable number of interleaves. Additionally, sampling of the k-space center with variable block-sizes was investigated. Compared to a fully sampled gradient-echo sequence, we show that acceleration by a factor up to 50 is feasible. Depending on the desired accuracy, whole-brain 3D $$$B_1^+$$$-mapping is possible in 5 to 10 seconds.
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