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Multi–Detector Row Helical CT Angiography of Hepatic Vessels: Depiction with Dual-arterial Phase Acquisition during Single Breath Hold¹

¹ From the Department of Radiology, Osaka University Medical School, Osaka, Japan (S.T., T.M., M.T., T.K., M.H., Y.N., H.N.); and GE Yokogawa Medical Systems, Ltd, Tokyo, Japan (M.K.). Received January 17, 2001; revision requested February 20; revision received May 8; accepted June 20. Address correspondence to S.T., Department of Radiology, Osaka Central Hospital, 3-3-30 Umeda, Kita-ku, Osaka 5300001, Japan (e-mail: takahasi@radiol.med.osaka-u.ac.jp).

PURPOSE: To determine by using multi–detector row computed tomography (CT), in a triphasic hepatic dynamic study, which included single breath-hold dual-arterial phase acquisition, the accuracy and frequency of visualization of the small hepatic arterial and portal venous anatomy with angiographic correlation.

MATERIALS AND METHODS: In 62 patients, pre- and postcontrast triphasic helical CT were performed by using a multi–detector row CT scanner, with 2.5-mm detector row collimation, at a pitch of 6. The first and second arterial phases were performed during a single breath hold. One reader, blinded to the results of the angiography, reviewed the first arterial phase images on a cine display to assess hepatic arterial anatomy. Visualization of the portal vein and its branches was assessed by using second arterial and portal venous phase images.

RESULTS: Major arterial trunks (celiac, hepatic, superior mesenteric, and left gastric) were depicted in all cases. Visualization of small arteries was as follows: right and left hepatic, 62 (100%) of 62; middle hepatic, 52 (87%) of 60; cystic, 47 (90%) of 52; right gastric, 50 (89%) of 56; and right and left inferior phrenic, 57 (92%) and 55 (89%) of 62, respectively. Subsegmental or more peripheral branches of the portal vein were depicted in 83% of cases during the second arterial phase and in 96% during the portal phase. There was no difference in degree of visualization in these two phases.

CONCLUSION: Multi–detector row CT angiography was able to depict the hepatic vascular anatomy.

Index terms: Computed tomography (CT), angiography, 95.12916 • Computed tomography (CT), helical, 95.12915 • Computed tomography (CT), maximum intensity projection, 95.12919 • Hepatic arteries, CT, 95.12916 • Hepatic veins, CT, 95.12916

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