GE HiSpeed advantage computed tomography scanner.

Abstract

Computed tomography (CT) scanners use x-rays to produce thin cross-sectional images, or slices, of human anatomy. Their applications include diagnosing head and body masses, assessing bone mineral content, displaying vasculature, and detecting and evaluating stenosis in blood vessels. Currently, three different CT scanning methods are available: (1) conventional CT; (2) spiral scanning, in which information is collected in a single continuous scan rather than in discrete slices; and (3) ultrafast CT, in which a rotating x-ray beam is produced without the movement of mechanical components. ECRI conducted this Evaluation at a hospital that had just taken delivery of a new GE Medical Systems HiSpeed Advantage CT scanner, a third-generation unit that can perform conventional or spiral scanning. This study, which was performed in conjunction with acceptance testing, provides the essential information required to ensure adequate system performance. The capabilities that we tested include tomographic slice geometry, radiation output, image quality, and human factors design. Readers are cautioned not to base purchasing decisions on our rating of this device alone, but on a thorough understanding of the issues surrounding CT scanners and the factors used to develop our conclusions, which can be acquired only by reading this study in its entirety. Reviewing the entire study will also help readers to gain the perspectives necessary to judge units other than the one we have evaluated.