PURPOSE: To analyse the branching of the hepatic artery and respective arterial blood supply of liver segments, based on the Counaud classification. MATERIALS AND METHODS: The analysis was based on 176 patients who had undergone celiac arteriography, superior mesenteric arteriography, spiral CT hepatic arteriography(CTHA) andlipiodol CT for the detection of hepatic lesions. We compared CTHA findings with those of angiography and Lipiodol CT. RESULTS: There were five groups of hepatic artery variations and 23 of segmental supply pattern. The mostcommon branching pattern was that all branches arose from the common hepatic artery(131 cases ; 74%). The most common segmental supply pattern, seen in 38% of cases, is that the right hepatic artery supplied segments V-VIII, and the left hepatic artery supplied segments II-IV. Segment IV supply was mainly from the left hepatic artery, with 34% being provided by the right hepatic artery ; the supply to segment IV from the hepatic artery also satisfied 76% of the supply needs of segment 1. CONCLUSION: These results could be helpful for the planning of treatment such as transarterial chemoembolization or subsegmentectomy.