| Computerized tomography (CT), is a noninvasive diagnostic form of x-ray that makes cross-sectional images (slices), in different planes, of the interior of the body. Unlike the flat films of conventional radiography, the CT scanner circles the body measuring the transmission of x-rays as they pass through body structures, and taking multiple x-rays as it repeats this measurement (called a projection) in many different directions through the same section or slice of the body. When a sufficient number of projections in different directions are measured, the resulting data can create a single, unique arrangement in two- dimensions of the intervening body structure. Adjacent two-dimensional slices can then be reconstructed to produce three-dimensional structures for visualization of abnormalities, or for surgical planning.
A dye-like material (contrast medium) may be injected intravenously to make blood vessels, organs, or abnormalities show up more clearly. Compared to other diagnostic methods (angiography, ventriculography), CT scanning is simple, quick, and, because it uses an ultra-thin low-dose x-ray beam, it provides less exposure to radiation; it gives highly detailed visualization of the internal organs and soft tissues, providing a view of an entire area of interest with a single exposure. Spiral CT is advantageous for trauma victims because it minimizes time spent performing the scan.
CT scanning is used for the diagnosis and treatment of head injury or body trauma or to detect tumors or other abnormalities. |
Source: Medical Disability Advisor