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In abdominal surgeries, understanding of structures of blood vessel is important. Surgeons utilize CT images for such purpose. In this paper, a method for automated anatomical labeling of the abdominal veins is presented. A thinning process is applied to a abdominal vein region extracted from a 3D CT image. The result of the thinning process is expressed as a tree structure. Firstly, a characteristic blood vessel is labeld with a rule-based method. For the rest of blood vessels, likelihoods are labeled by using a machine learning technique. Then, branches in the tree structure are labeld by searching a child branch whose likelihood is the maximum. 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