Fig. 2.

Illustration of metrics. The DSC is computed as $\text{DSC}=\frac{2\left(\text{A}\cap \text{B}\right)}{\text{A}+\text{B}}$ and may take values from 0 to 1. A larger number indicates better volume overlap. Hausdorff Distances are the minimum distances from every point in A to any point in B (e.g. red lines) and from B to A (e.g. blue lines). The maximum and mean of these distances are the HD max and HD mean. Smaller numbers indicate less extreme deviations between contour surfaces. HD max is more sensitive to projection-like deviations than DSC. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)