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Computed tomography, also known as CT, is a diagnostic medical procedure used to obtain cross-sectional anatomy images of the body. CT exposes a limited portion of the body to radiation, thereby creating a volume of anatomical data. Data can be formatted in a variety of planes (transverse, coronal or sagittal) or 3D representation, as well as manipulated through windowing.
CT may utilize a contrast media (iodine or barium) to enhance the organs and structures of the body or may create anatomical images without contrast media. CT is used to image a large number of conditions such as infection, cancer, aneurysm, cyst, abscess, kidney stones, hemorrhage or injury to an organ. CT may also be used to guide a needle during tissue biopsy, help determine the spread of cancer (staging) or assist in the planning process for radiation therapy treatment. For images of blood vessels, a CT angiogram may be performed, rather than the standard CT scan.
CT technologists may be employed in a variety of settings including hospitals, physician offices and diagnostic imaging centers. According to the 2008-2009 Occupational Outlook Handbook, radiographers experienced in more than one diagnostic imaging procedure such as CT will have the best employment opportunities.