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Typical CT images from the 3Dircadb (a)–(i) and Sliver07 (j)–(r) datasets. Each row corresponds to one case. The first, second, and third columns are axial slices, sagittal slices, and coronal slices, respectively. The original CT images in (a)–(i) and (j)–(r) are used in Figures 8 and 9, respectively. For vessel segmentation, (a)–(c) and (j)–(l) are of high contrast, while (d)–(i) and (m)–(r) are of low contrast.
