Computerized Tomography: CT

A Computerized Tomography (CT) combines both the use of computer and x-ray to create an image to allow physicians to see inside the body without surgery or invasive procedures. Prior to the exam, a contrast medium may be given orally or by injection to enhance the image. CT provides clear images of internal structures throughout the body. Dense tissues, such as bones, appear white in the pictures produced by a CT scan. Fluid-filled spaces, such as the openings in the brain (ventricles), appear dark gray. Air-filled spaces, such as the facial sinus cavities, appear black.

CT scans of internal organs, bone, soft tissue and blood vessels provide greater clarity and reveal more detail than regular x-ray exams. With CT scanning, numerous x-ray beams and a set of electronic x-ray detectors rotate around you, measuring the amount of radiation being absorbed throughout your body. At the same time, the examination table is moving through the scanner, so that the x-ray beam follows a spiral path. A special computer program processes this large volume of data to create two-dimensional cross-sectional images of your body, which are then displayed on a monitor. This technique is called spiral CT.Shorter scan times allow the technologist to:

• Spend more time with the patient
• Scan a wider range of patients comfortably and easily
• Improve patient comfort and diagnostic efficiency.

Radiologists can more easily diagnose problems such as cancers, cardiovascular disease, infectious disease, trauma and musculoskeletal disorders. The radiologist interprets the results of the exam, and the report can then be phoned or faxed to the referring physician the same day the scan is taken.To enhance the CT image, you may be given a contrast agent through an intravenous line (IV) or by injection. An imaging procedure typically lasts from 15 to 45 minutes, depending on the type of information requested by your physician.

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