Figure 10.

These two examples demonstrate the different properties of the maximum thickness (t_max) and the mean thickness (t_mean) metrics. (a) and (c) show the original images of two image slices. (b) and (d) show the corresponding images with boundaries superimposed. The green contours in (b) and (d) represent the manual segmentation. The light and dark blue contours represent the outer wall boundaries produced using Methods SA0 and SA5 respectively. The semiautomated segmented lumen boundary is represented by the red contours. In these two examples, Method SA5 overestimated the vessel wall size more than Method SA0, which was reflected by the difference in t_mean. However, t_max produced by the two methods were similar.