Vertebral Column Localization, Labeling, and Segmentation - Spinal Imaging and Image Analysis - page 209

Fig. 16 Range filter 3 × 3
window on the CT image [ 1 ]

They then applied the GVF-snake by initializing its contour to the contour
produced by the ASM, that is the points k 1 to k 16 . Figure 15 shows the same
example after the convergence of the GVF-snake.
Figures 17 and 18 show four cases selected from the data set to show the
robustness of the

final contour despite the various abnormalities in various lumbar
levels. They performed qualitative measure where a radiologist visually and care-
fully examined each vertebra contour and approved the automated segmentation
contour for all cases.