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.

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.
References in periodicals archive ?
A laser collimator doesn't need crosshairs, so you just need to drill the holes for your laser mounting screws.
All exposures with both universal and enhanced collimator devices were made using an intraoral Planmeca Prostyle x-ray unit (Intra, Planmeca USA, Roselle, Ill).
In this research, a pigtail-type fiber optic collimator is used to minimize the emitted light dispersion at the end surface of the OF and maximize the reflected light receiving rate from the reflective mirror.
A 2 mm diameter collimator and counting times of 30 s ([sup.137]Cs) and 60 s ([sup.241]Am) were employed in the spectra measurements for the free beam and with each of the two samples used.
Regarding the effect of the collimator type, 18 patients in group A were imaged with the LEHR collimator and 21 patients in group B, with the MEGP collimator.
Other parameters, including number of projections, time per projection, and number and distribution of pinholes on the collimator, were maintained constant for each target organ.
The solar divergence collimator can be realized in axis (S1-S2) if the examined collectors have reduced dimensions.
The team chose Maxon's EPOS2 Module 36-2 compact digital positioning controllers for their small form factor, which allowed them to package 60 channels of motion control for each collimator. Thirty modules can fit on a single custom motherboard, and there are two motherboards per collimator.
Over 100 papers discuss such topics as designing a real-time autofocusing system for a collimator with a long focus length and large aperture, chance constrained model predictive control based on set-valued optimal algorithms, applying virtual prototyping technology in the design of a drive axle, the hydrodynamic forces of torsional wave propulsion by extended large-amplitude elongated-body theory, the power supply system of embedded portable devices, and numerical analysis in the residual stress test of welded joints for a wind-driven generator.
(XCP stands for "extension cone paralleling." Some dental assistants refer to them as "Rinn" devices, after a company that manufactures them.) The XCP device has a collimator ring that is parallel with the film--holding plane of the x-ray film holder.
The text is illustrated with b&w images and photos of equipment, and contains about 40 pages of reference appendices on basic electronics and devices, film and film processing, computer fundamentals, and collimator mathematics.