tomography /təmog″rəfē/ [Gk, tome + graphein, to record] , 1. sectional imaging. 2. a radiographic technique in which the tube and film are moved synchronously during exposure, producing a blurred radiograph in which objects within the focal plane are seen more clearly than objects outside the focal plane. 3. a radiographic technique that produces a film representing a detailed cross section of tissue at a predetermined depth. It is a valuable diagnostic tool for the discovery and identification of space-occupying lesions such as might be found in the brain, liver, pancreas, and gallbladder. See also computed tomography, positron emission tomography.
