Computed tomography

Computed tomography (CT) is a diagnostic procedure that uses special X-ray equipment to create cross-sectional pictures of your body. CT images are produced using X-ray technology and powerful computers.
The uses of CT include looking for
Broken bones

Cancers

Blood clots

Signs of heart disease

Internal bleeding

During a CT scan, you lie still on a table. The table slowly passes through the center of a large X-ray machine. The test is painless. During some tests you receive a contrast dye, which makes parts of your body show up better in the image.

To Prepare 
•  Do not eat or drink anything, including water, for 4 hours before the 
test. 
•  You may take your medicines with sips of water.   

During the Test 
•  If you are having an abdominal (stomach) or pelvic scan, you need to drink liquid dye.  You  drink the first part of the liquid  when you arrive, more about 30  minutes later and the rest of the  liquid just before your scan, about  1 hour later. 

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Nov 4, 2013
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While cancers of the lips, cheek, palate and tongue are less common than other cancers, they can be fatal. However, early detection and treatment can improve your chances for survival and recovery dramatically, according to doctors at Washington University.
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