We compare the detectability of multi shot EPI (msEPI) and single shot EPI with GRAPPA (ssEPI-GRAPPA) using D-value maps to show the benefit of BISEPI (Block-Interleaved Segmented EPI) [1] for the same total acquisition time. D-values were derived based on the relationship between target effect, the significance level of detection, the number of time points (volumes), and tSNR [2]. The proposed D-value maps can be a useful quality assurance measure for determining the tSNR gain and activity detection performance of msEPI in comparison to ssEPI-GRAPPA in high-resolution fMRI at 7T.
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