Single-Breathhold Spiral Volumetric CT (SVCT) of the Lung and the Hepato-Biliary System

Abstract

We adapted the table feed mechanism for patient transport during continuous rotation scanning with the intention to examine complete subvolumes of the lung and the hepato-biliary system during a single breathhold. 21 adult patients for each of the two areas were scanned during up to 12 continuous 1-second rotations; data acquisition was synchronized with longitudinal patient motion at 1 slice thickness per second. Interpolated planar raw data were obtained retrospectively for any level within the volume. Image quality was comparable to standard images. Due to the continuous scanning process, pulmonary nodules and focal hepatic lesions were never omitted, their center could always be depicted, and secondary reformations as well as 3D-reconstructions were easily obtained. We conclude that SVCT, by completely surveying a subvolume of the lung or the hepato-biliary system, is an attractive new application of CT.