A diagnostic technique in which the combined use of a computer and X-rays passed through the body at different angles produces cross-sectional images of tissues. CT (computed tomography) scanning has revolutionized the diagnosis and treatment of tumours, abscesses, and haemorrhages in the brain, as well as head injuries and strokes. CT scanning is also used to locate and image tumours, investigate diseases, and aid needle biopsy in organs of the trunk. Newer types of CT scanners use a spiral technique: the scanner rotates around the body as the patient is moved slowly forwards on a bed, causing the X-ray beams to follow a spiral course. The computer produces 3-D images. Injected or swallowed contrast media (chemicals opaque to X-rays) may be used to make certain tissues more visible.
CT scanning |
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