Spinal Cord Segmentation Validation Results.

Top: Validation of spinal cord segmentation. Comparisons are made between Rater 1 (R1), Rater 2 (R2), and the semi-automatic (SA) methods. The 3D Dice coefficient (DC) measures the amount of overlap between two 3D volumes; mean distance (MD) measures the average distance between the spinal cord center-line in all axial planes of the image; Hausdorff Distance (HD) measures the maximum distance between the two 3D surfaces.Bottom: Adjustments made to the base case segmentation. First, the impact of using a cascade of smoothing filters with different kernel sizes on the segmentation metrics is shown. Second, the impact of using two subjects to create the ground truth data is shown, using both the set of the worst two performing sets of data and the best two performing sets of data.Spinal Cord Segmentation Validation Results.