Cat Scan Information
A computed tomography (CT) scan is an imaging method that uses a rotating X-ray device to produce cross-sectional pictures that are like slices of the internal workings of your body. The National Institute of Health says CT rapidly creates in-depth pictures of organs including the abdomen, spine, chest and brain to help pinpoint abnormalities.
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When is CT Used?
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There are a number of reasons a doctors may recommend a CT scan. CT images aid in the detection heart disease and tumors including cancer. Sometimes CT is used to closely examine blood vessels or detect internal injuries and internal bleeding. A CT scan can help steer a surgeon to a precise area during surgery, radiation or a biopsy procedure.
Preparing for a CT
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A CT scan is a painless exam that can be performed in a hospital or in a clinic setting. It generally takes no longer than one hour to complete.
The National Institute of Health says certain exams necessitate a special dye, called contrast, to be delivered into the body prior to the test. In that case you may be asked to refrain from eating or drinking anything for four to six hours before the CT scan.
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Contrast
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A contrast medium can emphasize particular areas inside the body. It may be delivered through a vein (IV), as an enema through the rectum or you may drink the substance that may have a chalky taste to it. You may experience a momentary sensation of heat or notice a metallic taste in your mouth. The contrast will eventually be eliminated from your body during your bowel movements.
What to Expect
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As you prepare to undergo a CT you will lie on a table that sits inside a circular machine called a gantry. An X-ray tube located inside the gantry revolves around your body and emits tiny doses of radiation through it at various angles. As X-rays move through your body, different tissues absorb varying amounts of radiation. This radiation is transformed into electric signals.
A computer collects these signals and they are assigned a color from black to white depending on the strength of the signals intensity. The computer compiles the images for view on a computer monitor.
After Your CT
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You can resume your normal routine immediately after your CT-scan. If you were given a contrast medium, you'll be advised to drink plenty of fluids to help your kidneys flush the substance out of your body.
CT Results
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CT images are stored as electronic data files and usually reviewed on a computer. A radiologist will analyze the images and report her findings to your doctor.
CT results are considered normal when the organs and structures being studied do not appear to show any abnormalities.
When the scan determines that something is amiss, the magnitude of the abnormality is linked to the part of the body under examination and the specific type of problem.
Risks
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The risks associated with CT scans are comparable to those of traditional X-rays. Although you will be exposed to low dose of radiation, the NIH says the medical and scientific communities agree that CT scans provide enough significant information to outweigh the risks. If you are pregnant, your doctor may suggest another kind of exam so as not to expose your fetus to radiation.
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