Figure 5b. Volume-rendered images obtained with different section thicknesses at four-channel CT. The first row of data on the images is the detector configuration, the middle row is the weighted CT dose index, and the bottom row is the scanning time. (a) Image obtained with a reconstructed section thickness of 5.0 mm and an increment of 2.5 mm shows the right hepatic artery (arrow) where it arises from the celiac artery. The origin of the left hepatic artery (arrowhead) at the left gastric artery also is visible but is not well depicted. (b) Image in a similar orientation, obtained with a reconstructed section thickness of 2.5 mm and an increment of 1.25 mm, shows both hepatic arteries more clearly and with a smoother appearance than in a.