Gamma Scintigraph

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Gamma Scintigraph

 

(also gamma scanner), an instrument for the automatic recording of the intensity distribution in any organ of the radiation from a radioactive preparation that has been introduced into the organism for diagnostic purposes. Types of gamma scintigraphs include all-purpose scanners, for all aspects of gamma scintigraphy; scanners with a field of 40 × 40 cm, for the examination of individual parts of the body; and specialized scanners, with two detectors and a complicated scanning program (arcs of variable length), for diagnosing brain tumors.

A gamma scintigraph consists of a gamma-radiation detector (counter), which is moved over the patient along lines or arcs by an electronic device that converts the counter’s signals into a form suitable for recording. Depending on the instrument’s design, the recording may be in the form of simple dashes on paper through a carbon paper or a typewriter ribbon, a photographic recording by means of a light source on photographic film or X-ray film with an undeveloped X-ray picture of the irradiated region of the body (combined X-ray and gamma-ray scintigrams), recording on magnetic tape with subsequent processing of data, or multicolored dashes or luminous marks. The information thus obtained (the scintigram) makes it possible to make a judgment concerning the shape, position, dimensions, and functions of an organ.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.