Twenty asymptomatic volunteers underwent helical computed tomographic (CT)
cholangiography 10-12 hours after ingesting iopanoic acid. Three observers
assessed the images for the extent of bile duct visualization and image qua
lity. The common bile duct and common hepatic duct were adequately visualiz
ed in 19 (95%) subjects. Helical CT cholangiography with oral cholecystogra
phic contrast material is feasible and deserves further clinical studies.