Fig. 8.
(a) Distribution plots depicting the mean and standard deviation of the CR across participants using the MT-3DEPI data for all cortical ROIs, in the MT-3DEPI space. The results from no-correction, and reversed-PE or B0 field-mapping-based distortion correction are shown by red, green and blue bars respectively. Those ROIs marked with orange rectangles, selected based on multiple comparison analysis, showed a significant increase in CR following distortion correction. The A, B and C letters below the orange rectangles indicate “reversed-PE > no correction”, “B0 field mapping > no correction” and “reversed-PE > B0 field mapping” respectively. (b) Relative CR maps, calculated based on equation 1, for both reversed-PE and B0 field mapping correction techniques in 48 ROIs defined by the Harvard-Oxford cortical atlas. Red indicates relative CR improvement while blue indicates reduced CR following distortion correction, however the latter effects were never significant.