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Cervical spine CT scan

CAT scan of cervical spine; Computed axial tomography scan of cervical spine; Computed tomography scan of cervical spine; CT scan of cervical spine; Neck CT scan

A computed tomography (CT) scan of the cervical spine makes cross-sectional pictures of the neck. It uses x-rays to create the images.

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How the Test is Performed

You will lie on a narrow table that slides into the center of the CT scanner.

Once you are inside the scanner, the machine's x-ray beam rotates around you. (Modern "spiral" scanners can perform the exam without stopping.)

A computer creates separate images of the body area, called slices. These images can be stored, viewed on a monitor, or printed on film. Three-dimensional models of the cervical spine can be created by adding the slices together.

You must be still during the exam. Movement can cause blurred images. You may need to hold your breath for short periods of time.

The scan takes 10 to 15 minutes.

How to Prepare for the Test

Some exams use a special dye, called contrast that is put into your body before the test starts. Contrast helps certain areas show up better on the x-rays.

Contrast can be given in different ways:

If contrast is used, you may also be asked not to eat or drink anything for 4 to 6 hours before the test.

Let your health care provider know if you have ever had a reaction to contrast. You may need to take medicines before the test to avoid this problem.

Before having the contrast, tell your provider if you take the diabetes medicine metformin (Glucophage). You may need to take extra steps before the test if you take this drug.

Too much weight can cause damage to the scanner's working parts. Find out if the CT machine has a weight limit if you weight more than 300 pounds.

You will wear a hospital gown during the study. You will need to take off all jewelry.

How the Test will Feel

Some people may have discomfort from lying on the hard table.

Contrast given through an IV may cause a slight burning feeling, a metal taste in the mouth, and a warm flushing of the body. These feelings are normal and go away in a few seconds.

Why the Test is Performed

CT makes detailed pictures of the body very quickly. The test may help look for:

Normal Results

Results are considered normal if the cervical spine looks ok.

What Abnormal Results Mean

Abnormal results may be due to:

Risks

Risks of CT scans include:

CT scans expose you to more radiation than regular x-rays. Having many x-rays or CT scans over time may raise your risk for cancer, but the risk from any one scan is small. Talk to your provider about this risk and how it weighs against the benefits of the test.

Some people have allergies to contrast dye. Let your provider know if you have ever had an allergic reaction to injected contrast dye.

Rarely, the dye may cause a life-threatening allergic response called anaphylaxis. If you have any trouble breathing during the test, you should notify the scanner operator immediately. Scanners come with an intercom and speakers, so the operator can hear you at all times.

References

Even JL, Eskander MS, Donaldson WF. Cervical spine injuries. In: Miller MD, Thompson SR, eds. DeLee and Drez's Orthopaedic Sports Medicine. 4th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 126.

Gardocki RJ, Camillo FX. Other discorders of the spine. In: CanaleST, Beaty JH, eds. Campbells's Operative Orthopaedics. 12th ed. Philadelphia, PA: Elsevier Mosby; 2012:chap 44.

Shaw AS, Prokop M. Computed tomography. In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 6th ed. New York, NY: Churchill Livingstone; 2014:chap 4.

Thomsen HS, Reimer P. Intravascular contrast media for radiology, CT, and MRI In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. Grainger & Allison's Diagnostic Radiology: A Textbook of Medical Imaging. 6th ed. New York, NY: Churchill Livingstone; 2014:chap 2.

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Review Date: 3/5/2015  

Reviewed By: C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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