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Definition Return to top
An abdominal CT scan involves X-ray images of the abdomen from many angles. The X-ray beams are detected by the scanner and analyzed by a computer. The computer reconstructs the data into a picture of the body area being scanned. These images can be viewed on a monitor or reproduced as photographs.How the test is performed Return to top
The CT scanner is a free-standing machine with a large hole in the center. The patient lies on a narrow table that slides into the hole. In most cases the patient will be on his or her back with arms raised above his head. Patients who have difficulty with enclosed spaces such as those found with some MRI scanners do not usually have a problem with this type of test.
A dye may be injected into a peripheral vein to better evaluate certain diseases and organs. The radiologist will decide if this is necessary. Tell the technician or radiologist if you have any allergies or have had difficulty with prior CT scans.
It is very important that the patient remains still throughout the exam and holds his or her breath when asked. This will allow for better images.
The actual scan time is usually about two minutes, although the entire procedure usually takes much longer.
How to prepare for the test Return to top
Tell the health care provider if you have any allergies or have had difficulty with prior CT scans.
You may be advised to fast for 4 to 6 hours if contrast dye or sedation is to be used.
You will be given a hospital gown to wear during the procedure. You may be asked to sign a consent form.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experiences, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel Return to top
The X-rays are painless. The primary discomfort may be from the need to lie still on the table.Why the test is performed Return to top
An abdominal CT is a noninvasive way for a health care provider to evaluate a patient's internal organs and tissues. There are many reasons for this test to be ordered. Some common uses are for the evaluation of tumors, infections, kidney stones, or appendicitis.
What abnormal results mean Return to top
The CT scan may show the following:What the risks are Return to top
CT scans and other X-rays are monitored and regulated to provide the minimum amount of radiation exposure needed to produce the image. CT scans provide low levels of radiation. During pregnancy, an abdominal CT scan is usually not recommended, because there is some evidence of risk to the fetus.
The most common dye used is iodine based. A person who is allergic to iodine may experience nausea, sneezing, vomiting, itching, or hives. Rarely, the dye may cause anaphylaxis (a life-threatening allergic response).
Special considerations Return to top
A CT scan provides a better picture of internal organs than conventional X-rays. The benefits of an abdominal CT scan usually far outweigh the risks of radiation exposure. Update Date: 5/9/2003 Updated by: Benjamin Taragin, M.D., Department of Radiology, Columbia Presbyterian Medical Center, New York, NY. Review Provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |
