A CT scan produces an image of a cross section of the body. It is a safe procedure. It uses x-ray beams, but provides much more detail than a standard x-ray film. It can help diagnose problems with various internal organs.

CT is short for computerized tomography. Tomography means that the x-ray tube travels in an arc around the body. It sends many beams though the same flat plane. The beams are altered by the nature of tissues they pass through. These changes are detected on the other side of the body and analyzed by computer. The computer translates the image to a film that contrasts various tissue types in different shades.

CT scans are useful for identifying tumors, blood clots, cysts, or obstructions. They can view various parts of the body, including:
* liver and gall bladder,
* pancreas,
* the spine or skeleton,
* kidneys,
* eyes,
* chest and back.

Scanning typically lasts from 30 to 90 minutes. It is painless. The person may receive an injection of dye to create contrast. If so, the person is instucted to fast for 4 hours before the test. Some people are sensitive to the contrast dye. The dye may cause warm feelings, flushed face, temporary headache, salty taste, or nausea and vomiting.

During a CT scan, the patient lies still on a table. He or she removes all jewelry and metal. The table slides into the CT unit, which is like a small tunnel. It is important not to move during the scan, although you can breathe normally. The scanner rotates around the table, and may make clacking noises. Communication is maintained throughout the procedure. If a person becomes panicky, the procedure may be stopped at any time. Some people have a fear of enclosed spaces. The doctor may give a mild sedative to restless or anxious people.

After a CT scan, one should watch for signs of delayed reaction to the contrast dye. These include itching, rash, sweating, or difficulty breathing. The person should drink plenty of fluids to rid the body of the dye. CT scanning of the abdomen should not be performed during pregnancy.

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