CAT Scan

What is it?

A test done to produce cross sectioned pictures using xrays and computer enhancement. The images are like slices of the body. It is also called Computerized Axial Tomography, or CT Scan.

What is the purpose?

It is used when your doctor needs more detailed information than regular x-rays can provide. Makes it possible to detect even minor abnormalities.

Is there any special preparation?

If you are having a CT with contrast(dye) you may be instructed to fast for 4-6 hours prior to the test. Failure to follow the instructions may result in poor quality test results and the procedure may have to be repeated.  You may be asked to sign a consent form and put on a hospital gown.

How is it done?

You may be injected with a dye before the procedure, this is called a CT with contrast. If you are ordered a CT without contrast no injection will be given. You will lay flat on a movable table that will run through a donut-like scanner. The images are sent to a computer that will put them together in a cross sectional view.

What happens afterwards?

There are usually no post test instructions. 

What are the risks of this procedure?

The dye that is usually used contains iodine. If you have an iodine allergy please alert your physician prior to the test.

Does it hurt?

Of course if it involves an injection, there is some pain involved. The dye is injected directly into a vein, so it is the same pain you would have if you had an I.V. started. This is usually very minimal pain, although some people may experience a stinging sensation. You may feel a warm or cool sensation as the dye is injected.

For more information:

MedicineNet CAT Scan
Med Expert.net CAT Scan

References:
Yale University School of Medicine, Patient's Guide to Medical Tests
Adult Health Advisor -Arthrocentesis, Copyright © Clinical Reference Systems 1999
Medicinenet