Rendering showing the detected 3D surface points, the 2D projection of the border points (red) and two virtual paths computed automatically by virtual active navigation (SDT = 90 HU, FOV = 140°, MDS = 1, Nmax = 5, starting point:P1, target points: E1, E2) in the aorta with aneurism and iliac arteries (CT acquisition parameters: 5 mm thickness slices, reconstructed every 4 mm, voxel size: 0.49 × 0.49 × 0.49 mm3 after interpolation).