[Demonstration of caudate lobe bile ducts using 3D-CT cholangiography]

The aim of this study is to make precise analysis of bile ducts of the caudate, lobe using 3D-CT cholangiography. Seventy obstructive jaundiced patients without lesions at the hilar duct level were included in this study. According to Kumon's study. I divided the caudate lobe into three areas: spiegel lobe (sp), caudate process portion (cp) and paracaval portion (pc), and set the range for these three areas in chlangio CT. In 70 cases, 191 caudate branches were detected and those draining areas and confluence patterns were analysed. 3D-CT cholangiography could be obtained from randomized angles. In set up the 8 angles from 0 degree to 330 degrees in sagittal plane to demonstrate intrahepatic bile ducts and investigate the suitable angles for detecting caudate lobe branches in each draining area. Suitable angles for detecting the branches of Sp group (104 branches) were 180 degrees, 210 degrees, 150 degrees and 330 degrees (detectabilities were 89.4%, 61.5%, 51.0% and 47.1% respectively). Suitable angles for detecting the branches of Pc group (80 branches) were 180 degrees, 210 degrees, 150 degrees, 330 degrees and 0 degree (detectabilities were 91.3%, 65.0%, 57.5%, 48.8% and 41.3% respectively). Suitable angles for detecting the branches of Cp group (67 branches) were 210 degrees, 180 degrees, 330 degrees, 150 degrees and 0 degree (detectabilities were 80.1%, 73.1%, 50.7%, 49.3% and 47.8% respectively). The images from 150 degrees, 180 degrees, 210 degrees were necessary to demonstrate the caudate lobe branches in 3D-CT cholangiography.