CT Scanning

What is CT scanning?

CT scanning, also called computed tomography, is an x-ray test used for diagnosis. X-rays are taken from a series of different angles and arranged by a computer to show a cross-sectional view of organs in the body.

When is it used?

CT scanning is used when your health care provider needs more detailed information than regular x-rays provide.

How do I prepare for a CT scan?

No preparation is necessary unless your health care provider gives you special instructions. For example, if you are having a CT scan of your abdomen or pelvis, you should not eat solid food during the 6 hours before the scan.

What happens during the procedure?

CT scanning can be done in a hospital or mobile unit. You will lie down on a moving table that will slide you into the scanner. The scanner can move around you to change the angles of the x-rays.

Inside the scanning machine, multiple x-ray beams are passed very quickly through your body at different angles. The images are projected onto a TV screen and prepared for your health care provider to examine.

A solution of dye (also called contrast) may be injected into a vein, or you may be asked to swallow the solution. This may allow the scanner to show abnormalities as the dye passes through your body.

What happens after the procedure?

Generally, there are no special measures to take after the procedure.

What are the benefits of this procedure?

A CT scan provides detailed pictures to help your health care provider diagnose your problem.

What are the risks associated with this procedure?

In this procedure your body is exposed to a very small amount of radiation. Exposure to radiation can be dangerous if you are exposed to it often or in large amounts. However, the amount of radiation you receive in a CT scan is less than you might receive in many other x-ray tests.

If you are pregnant, you should not have a CT scan without first discussing the possible risks with your health care provider.

There is a small risk that you will have an allergic reaction to the dye. Be sure to tell your health care provider if you know you are allergic to any medications or chemicals such as iodine.

When should I call my health care provider?

Call your health care provider right away if:

• You have a worsening of pain or symptoms.

Call your provider during office hours if:

• You have questions about the procedure or its result.