What is CT scanning?

Computed tomography or CT scanning is a radiographic procedure used for diagnosis. X-rays are taken from a series of different angles and assembled to show a cross- sectional view of internal organs. In this procedure your body is exposed to a very small amount of radiation.

When is it used?

CT scanning is used when your doctor needs more detailed information than regular x-rays provide, particularly to look for head injuries, brain disease, and tumors.

How do I prepare for CT scanning?

No preparation is necessary unless your doctor gives you special instructions.

What happens during the procedure?

CT scanning can be done in a hospital. You are put in a reclining position on a moving table that can change your position inside the scanner. The scanner itself can move around you to change the angles of the x-rays. Contrast media may be injected into your blood vessels or you may be asked to swallow the contrast media, which will show any abnormalities as it passes through the body. This process is called enhancement.

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 the doctor to examine.

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 may help the doctor diagnose your problem.

What are the risks associated with this procedure?

Exposure to radiation is considered unhealthy if you are exposed to it frequently or in large amounts. However, the amount of radiation you receive in a CT scan is not considered threatening.

Pregnant women should not have a CT scan without first discussing the possible risks with their doctor.

There is a small risk that you will have an allergic reaction to the contrast media. Be sure to tell your doctor if you know you are allergic to any medications.

When should I call the doctor?

Call the doctor immediately if you have any change or worsening of pain or symptoms.

Call the doctor during office hours if:

• You have questions about the procedure or its result.

• You want to make another appointment.