CAT or CT scans (computer-assisted tomography or simply
computerized tomography), are specialized X-rays that produce cross-sectional
images of the body. An Xray-emitting device moves around the body region being
examined. At the same time, an X-ray detecting device moves in the opposite
direction on the other side of the body. As these two devices move, an X-ray
beam passes through the body from hundreds of different angles. Since tissues
and organs absorb X-rays differently, the intensity of X-rays reaching the
detector varies from position to position. A computer records the measurements
made by the X-ray detector and combines them mathematically. The result is a
sectional image of the body that is viewed on a screen.
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