Computed Tomography (CT) Scan of the Spine

CAT Scan, Spine, CT (Computed Tomography), Spine, Spinal CT

How It Is Done

A CT scan is usually done by a radiology technologist. The pictures are usually read by a radiologist, who writes the report. Other doctors, such as a family medicine doctor, internist, or surgeon, may also review a CT scan.

You may need to take off any jewelry. You will need to take off all or most of your clothes. You may be able to wear your underwear for the scan. You will be given a gown to use during the test.

During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine.

The table slides into the round opening of the scanner, and the scanner moves around your body. The table will move while the scanner takes pictures. You may hear a click or buzz as the table and scanner move. It is very important to lie still during the test.

During the test, you may be alone in the scanning room. However, the technologist will watch you through a window. You will be able to talk to the technologist through a two-way intercom.

A CT scan usually takes 30 to 60 minutes but could take up to 2 hours.

CT scan with contrast (CT myelogram)

A standard CT scan may be done before the dye (contrast material) for a CT myelogram is given. The dye is usually put in the intrathecal space around your spinal cord. A sample of the fluid from the spinal canal (cerebrospinal fluid) may be taken out to look at under a microscope before the dye is put in.

If dye is placed in your back, you will lie on your stomach or on your side on a table in a fluoroscopy room. The dye is usually put in your lower back but may be put in at the base of your skull. The skin over the site may be shaved. It will be cleaned with a special soap. The area around the site may be numbed with medicine.

The table may be tilted or you may be moved into different positions so the dye moves to different areas of the spine.

You need to lie very still so the dye stays in the right place for clear pictures. Your pulse, breathing rate, and blood pressure may be checked during the test.

In some cases, the dye can also be put in a vein (IV) in your arm.

A CT scan with contrast material may take up to 2 hours. Drink lots of liquids for 24 hours after the scan to help flush the dye out of your body.

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Author:	Maria G. Essig, MS, ELS	Last Updated: July 19, 2007
Medical Review:	Paul D. Traughber, MD - Radiology Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
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