A rotating x-ray beam "scans" a narrow cross section of the body, many scans are taken. A computer reconstucts the image, which is displayed on a screen and permanently recorded.

Tomography: from the Greek word tomos, meaning "slice" or "section" and graphia, meaning "recording".

Example: Intravenous pyelogram or urogram.

The kidneys, ureters and bladder are observed when a contrast medium is injected into a vein. Images are timed. Special dietary preparation is usually necessary.

Contrast Medium:

If a contrast medium is needed, it will be given through an IV line.

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