Fig. 3.

A. g-Factor maps at 3 T and 7 T when undersampling in one direction (MB1, in-plane, R = 3), or in two directions (MB3, in-plane R = 3). g-Factor maps were calculated from sensitivity maps estimated from a phantom data acquired at different field strengths with 32-channel coils. B. Scatter plot of median 1/g value of all slices. Median 1/g values of each method were shown in black line, with median 1/g = 0.97 and 0.57 for 3 T MB1 and MB3 and 0.98 and 0.71 for 7 T MB1 and MB3.