Gradient-echo EPI using a high-degree shim insert coil at 7 T: Implications for BOLD fMRI.

Not surprisingly, consistent with the change in σ B 0 Global given in Table 1 , significance testing on a per‐pixel basis (388,257 gray‐matter pixels, from n = 8 subjects) showed that the reduction in B 0 offset is highly significant (paired t‐test, P < 10 ‐9 ).

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