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CT, or computed tomography, combines special X-ray equipment with sophisticated computers to produce multiple images or pictures of the inside of the body.
Patients lie on a table and are moved through a rotating ring or gantry. An X-ray tube rotates around the body (hidden by the gantry) and takes cross-sectional images. A computer takes those signals and assembles the images. The amount of radiation dispersed depends on the location of the scan as different tissues in the body absorb different amounts of radiation.
A CT scan can be used to: