Radiology, Vol 197, 357-363, Copyright © 1995 by Radiological Society of North America

ARTICLES

Helical CT of the liver: value of an early hepatic arterial phase

VM Bonaldi, PM Bret, C Reinhold and M Atri
Department of Diagnostic Radiology, Montreal General Hospital, McGill University, Quebec, Canada.

PURPOSE: To prospectively evaluate a dual-phase helical acquisition in computed tomography (CT) of the liver. MATERIALS AND METHODS: Two helical CT acquisitions were performed in 103 patients: hepatic arterial phase (HAP) 15 seconds after injection of 2 mL/kg contrast material at a rate of 6 mL/sec and the portal venous phase (PVP) 90 seconds after injection. Detection of focal liver lesions, vascular anatomic features, and perfusion abnormalities were assessed by two reviewers. Liver enhancement was also calculated on every section. RESULTS: Of 119 detected focal liver lesions, nine were seen during HAP only and 40 during PVP only. According to a 0-3 score, visualization of the arterial anatomic landmarks was better during HAP (P < .0001). Five right replaced and two left replaced hepatic arteries were visualized only during HAP. Parenchymal perfusion abnormalities were found in 32 patients during HAP and in four patients during PVP. CONCLUSION: A dual- phase acquisition depicted 8% additional focal liver lesions and outlined the entire vasculature of the liver.

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