Computed axial tomography

Abstract

The development of CT from the first-generation to the fourth-generation scanners is discussed. The second-generation slow scanners, now in general use, are adequate for head studies but have limitations in areas of the body such as lung, diaphragm, and liver where inherent motion is present. Emphasis is on head studies, where, except for patients with stroke, the examination has been cost-effective. The use of contrast enhancement, coronal sections, and metrizamide-cisternography is discussed. Although CT is highly effective in diagnosing intracranial processes, there is often a lack of specificity. The discussion of CT body scanning is limited to spine, chest, and abdomen.