Computed tomography (CT) is a technique that creates cross-sectional images with the use of x-rays and computerized image reconstruction. The patient passes through a gantry that contains an x-ray tube on one side and a set of detectors on the other. The gantry rotates around the patient, obtaining information from the detectors that is then analyzed by computer and displayed as an image. The image information can be manipulated by the computer to display a greater spectrum of densities than can be displayed on conventional x-ray film.
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