Fig. 3
From: Impact of region-of-interest method on quantitative analysis of DTI data in the optic tracts
Illustration of the four ROI methods (upper row: axial slices of whole MRI images; lower row: close-ups of the optic tracts and ROIs). From the left: a manual ROI in b0 image, b manual ROI in coregistered T1-weighted image, c ROI guided by FA-skeleton (FA-skeleton in green) and d ROI guided by probabilistic tractography. The pink lines in the tractography image represent the termination masks of the tractography. A complete ROI cannot be shown in a single axial slice as the optic tracts are oriented anatomically in an inferior-superior direction, thus only parts of the ROIs are seen in this image (indicated as red or blue voxels)