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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

col·li·ma·tor

(kol'i-mā'ter),
A device of high absorption coefficient material used in collimation.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

col·li·ma·tor

(kol'i-mā-tŏr)
A device of high absorption coefficient material used in collimation.
Medical Dictionary for the Dental Professions © Farlex 2012
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