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Thoracic CT

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Thoracic CT

Definition:

Thoracic CT is a computed tomography scan of the chest and upper abdomen.

Alternative Names:
Chest CT; CT scan - lungs; CT scan - chest

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How the test is performed:

You will be asked to lie on a narrow table (gantry) that slides into the center of the scanner. Depending on what is being scanned, you may lie on the stomach, back, or side. If contrast media (dye) is to be given, an IV (intravenous needle or tube) will be placed in a small vein of your hand or arm.

As with standard photography, if you move while the CT image is being taken, it will blur. Because of this, the operator of the scanner will tell you when to hold your breath and not move.

As the exam takes place, the gantry will advance small intervals through the scanner. Modern spiral scanners can perform the examination in one continuous motion of the gantry. Generally, complete scans will only take a few minutes. However, additional contrast-enhanced or higher-resolution scans will add to the scan time. The newest multi-detector scanners can image the entire body, head-to-toe, in under 30 seconds.

How to prepare for the test:

The health care provider may advise you to avoid eating or drinking for 4 - 6 hours prior to the scan, if contrast dye is to be used.

The CT scanner has a weight limit to prevent damage to the mechanized gantry. Have the health care provider contact the scanner operator if you weigh more than 300 pounds.