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Lung artery and vein segmentation. (a) a CTPA scan where the arteries and veins are segmented and overlayed, (b) 3-D visualization of the segmented pulmonary arteries (red) and veins (green), (c) separate 3-D visualization of the pulmonary arteries, and (d)-(e) the partition of the arteries into four different levels in terms of radius.
