Fig. 7.
(a) Distribution plots depicting the mean and standard deviation of the CR across participants using the MT-3DEPI data for all cortical ROIs in MP2RAGE space. The results from no-correction, and reversed-PE or B0 field-mapping-based distortion correction are illustrated by red, green and blue bars respectively. Those ROIs marked with orange rectangles, selected based on the ANOVA analysis, showed a significant increase in CR following distortion correction. The labels A, B and C indicate significant effects of “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 either B0 field mapping (left) or reversed-PE (right) correction techniques in each of the 48 ROIs defined by the Harvard-Oxford cortical atlas (https://neurovault.org/collections/262/). Red indicates relative CR improvement while blue indicates reduced CR following distortion correction, however the latter effects were never significant.