Fig 3.

Representative segmentations of the left facial nerve of subject 20 with an average Hausdorff distance of 0.64, Dice coefficient of 0.60, length difference of <1%, and segmentation volume difference of 8%. A, Segmentations of observer 1 (green outline) and observer 4 (red outline) superimposed on the CISS image show similar agreement along the main nerve root, bifurcation, and proximal aspects of the temporofacial and cervicofacial roots, with more distal variability along the cervicofacial root, even despite the similar length segmented. B, 3D rendering of the observer 1 segmentation. C, 3D rendering of the observer 4 segmentation. D, Dice overlap map shows the spectrum of agreement, with blue being good agreement and red being poor agreement.