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Centerlines for the arteries (a; blue lines with red surfaces) and veins (b; red lines with blue surfaces) are combined into the same space (c). Some vessel discontinuity exists due to threshold-related vessel removal from the probabilistic image atlases (Zhao and Ji, 2020a) and failed circle fitting at vessel junctions. In total, there are 5.3 k centerline sampling points for arteries and 7.9 k for veins, respectively, with an approximate point-to-point distance of 1 mm.
