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Improvements in color-coded PEV orientation maps as a function of the number of scans. (a) Representative PEV orientation maps computed from 1, 3 and 15 DTI scans, at two slice levels. The precision and accuracy of the PEV orientation within a scan session were computed on a voxel by voxel basis in 4 anatomical regions. (b) Angular variation (AV) and (c) angular bias (AB) of the PEV as a function of SNR. Anatomical locations and abbreviations are shown in Figure 3.
