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Computerized Tomography A computerized tomography scan is sometimes called a CT scan. Computerized tomography creates images using a computer and an X-ray sensing unit that circles around your body.
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Each image is a visual slice through the inside of your body. A CT scan shows more of your body with more precision. A CT scan is useful for: Identifying bone and muscle disorders, including osteoporosis Showing where a tumor or infection is Guiding surgery, biopsies or radiation therapy Monitoring the progress of a disease that grows worse over time Finding internal injuries or bleeding During a CT scan, you lie on a table inside a doughnut-shaped machine called a gantry.
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An X-ray tube inside the machine rotates around your body and beams small doses of radiation through it at various angles. As X-rays pass through your body, different tissues absorb different amounts.
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Detectors inside the gantry measure the radiation leaving your body and convert the radiation into electrical signals. A computer gathers these signals and gives them a color ranging from black to white depending on signal intensity.
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The computer then puts the images together and displays them on a computer monitor. A technician in a separate room supervises your exam and watches the images on the computer. He or she can see and talk with you through an intercom.
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A CT scan is painless. It can be done on an infant or toddler.
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Unlike magnetic resonance imaging, a CT scan can be done even if you have a pacemaker or cardioverter defibrillator. Sometimes a CT scan will be done after you have swallowed a contrast medium. The contrast medium blocks the X-rays and shows up white in the scan.
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This can help parts of your body show up better in the scan. For example, when a CT scan is combined with a myelogram, your doctor is able to see excellent nerve detail.
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During a myelogram, a dye is injected into the spinal canal. The dye, in turn, lights up the nerve roots making them easy to see during the CT scan.
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This type of diagnostic test is very sensitive. A myelogram is an excellent way for your doctor to see how the bone is affecting the nerve roots. Usually a CT scan takes less than an hour.
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Most of that time is spent preparing for the actual scan. As with an X-ray, a radiologist who is specially trained to read the images will look at the scan and send a report to your doctor or surgeon. A CT scan is about as safe as an ordinary X-ray.
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There is some brief exposure to radiation. However, the information that a CT scan provides outweighs the risks of the exposure. If any of the following apply to you, please tell your doctor: You are pregnant or think you might be.
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In this case, your doctor may want to recommend another type of diagnostic test. You have asthma or allergies. If it is necessary for you to have a contrast medium while the CT scan is done, there is a small possibility that you would have an allergic reaction to the medium.
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You have medical conditions such as diabetes, asthma, heart disease, kidney problems or a thyroid condition. These also may increase your risk of an allergic reaction to any contrast medium that may be needed during your CT scan.
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More information on preparing for your CT scan. Share Email Print Please ensure Javascript is enabled for purposes of website accessibility
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