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.
References in periodicals archive ?
Third, technical differences between the 2 collimators were based on the radiographic performance skills of the subjects.
Each imaging head is composed of a multipinhole collimator, a high intrinsic resolution columnar scintillator, an image intensifier and demagnifier tube, and a high-sensitivity electron-multiplying charge-coupling device (CCD).
The Project: A multi-leaf collimator device needed to offer greater levels of accuracy than any similar product on the market.
The neutron flux density after the collimator will be one order of magnitude less ([[PHI].
With the aid of the multileaf collimator, IMRT fields can treat targets more efficiently because they allow the physician to better conform the high-dose region to the tumor.
In 2003, we found out that diurnal changes in histogram shapes also disappear when alpha-radioactivity is measured with collimators that issue alpha-particle beams directed towards the Pole star.
has introduced a new beam-shaping system that will allow physicians to deliver more precise cancer radiation therapy treatments than ever before - - the Millennium MLC(TM)-120 multi-leaf collimator.
18,43] Scatter x-ray photons, which only serve to increase radiation dose to the patient, can be reduced by rectangular collimators.
Inveon features advanced multi-pinhole SPECT collimators for improved sensitivity and spatial resolution; groundbreaking new PET and SPECT acquisition and processing technology; and a unique PET transmission method for faster and more accurate attenuation correction.
A set of collimators for low energy gamma and high-resolution,
In Puschino we used a device with three light beam collimators directed towards West, East, and Polar Star and devices with alpha-activity measuring collimators directed the same towards West, East, and Polar Star.