Fig. 1.

Diffusion tractography results of the optic radiation (OR) in a representative MS patient. (a) Lateral geniculate nucleus (LGN) region-of-interest (ROI). (b) Subcortical white matter of the primary visual cortex (V1) ROI. (c) Volume-rendered thresholded probabilistic tractography results for the OR (yellow), LGN ROI (red) and V1 ROI (green). (d) Volume-rendered thresholded probabilistic tractography results for the OR (yellow) with segmented MS lesions (purple). The white arrow highlights the MS lesion in the OR while the blue arrow highlights the normal appearing white matter of the OR. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)