CAT Scan
(Computerized Axial Tomography)
CAT is the abbreviation for Computerized Axial Tomography. The CAT Scan is an advanced x-ray system combined with computer technology that makes very detailed pictures of cross-sections of the body.
A CAT scan shows more details than a regular x-ray, and, unlike an x-ray, it can make pictures of areas protected or surrounded by bone. It can show ducts, blood vessels, tumors, or any of the body's organs. A CT scan is 100 times clearer than an ordinary x-ray. As a result, a CAT scan can detect some problems at an earlier stage than x-rays.
Just prior to your CAT scan, you will be asked to remove anything that interferes with x-rays, such as glasses, jewelry, dentures, and hearing aids. You may also be asked to change into a hospital gown. You will then be asked to lie down on a narrow table where the technician will help you slide inside a large, donut-shaped ring.
Frequently, a liquid dye will be used by the radiologist, as a contrast material to enhance the scan results. Sometimes, the contrast material is injected into an IV (intravenous line) and sometimes it is swallowed, depending on the type of exam. If a contrast material is used, the doctor will explain the procedure to you.
As the scan begins, you will hear a humming, buzzing, or clicking sounds coming from the CAT scanner. The table you are lying on will move every few seconds, automatically positioning you for a new scan. It is very important to remain still. You may be given a sedative medication to help you relax if this is difficult for you. During the scan you will be alone in the scanning room. Doctors and technologists will observe you from a control room and communicate with you over an intercom. The procedure may take from 30 minutes to an hour depending on how much of the body needs to be scanned.
After the procedure, the technologist will ask you to wait a short time while the images are reviewed to make sure all the needed information has been obtained. Sometimes additional images are needed. After this, you are free to go. The results are sent to your doctor and will be reviewed with you.
You should always inform your doctor and the technician if you are pregnant or if there is any chance you are pregnant. The radiation exposure is minimal and unlikely to cause any side effects for non-pregnant patients. If contrast material is used, the radiologist will watch for allergic reactions such as nasal stuffiness, itching and hives. If the contrast material is given intravenously (through an IV line), it may cause you to urinate more frequently later that day.
Frequently Asked Questions
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