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(a) RF shimming excitations leading to the best uniformity of B1+, and the highest average |B1+|. The typical RF shimming excitation region is indicated as the average ± standard deviation of the relative amplitudes and phases. (b, c) Average |B1+| and CV (B1+) for the fetus as ROI (3C) in the fetus-centered imaging landmark. ROIs are defined in Figure 1.
