collimator

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collimator

 [kol´ĭ-ma″ter]
a diaphragm or system of diaphragms made of an absorbing material, designed to define and restrict the dimensions and direction of a beam of radiation.

col·li·ma·tor

(kol'i-mā'ter),
A device of high absorption coefficient material used in collimation.

collimator

[kol′imā′tər]
Etymology: L, collinare, to bring into alignment
a device for limiting the size and shape of a radiation beam. It is used to reduce scatter radiation, thereby decreasing the patient dose needed and increasing radiographic quality.

col·li·ma·tor

(kol'i-mā-tŏr)
A device with blocks or jaws that restrict a beam of emitted radiation to a given area; composed of a high-absorption coefficient material such as lead or tungsten.

collimator

1. A shield, shutter or cone, usually of lead, attached to an X-ray tube to limit the width of the beam.
2. A thick perforated lead plate designed to allow passage only of parallel radiation, as in a GAMMA CAMERA.

collimator 

An optical apparatus for producing parallel rays of light. It usually consists of a positive achromatic lens, with an illuminated object (a slit, a graticule, a scale, etc.) placed at one of its focal points, so that light from any point on the object emerges from the collimator parallel.

col·li·ma·tor

(kol'i-mā-tŏr)
A device of high absorption coefficient material used in collimation.

collimator (kol´imātur),

n a diaphragm or system of diaphragms made of an absorbent material and designed to define the dimensions and direction of a beam of radiation.

collimator

a device, sometimes a diaphragm, or series of diaphragms, which control the direction and the dimensions of the x-ray beam.