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.

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.

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

References in periodicals archive ?

A laser collimator doesn't need crosshairs, so you just need to drill the holes for your laser mounting screws.

Contemplating collimators: make high-precision tools from plastic piping and underwear

[alpha]-Radioactivity of a [sup.239]Pu preparation was measured using low-voltage semiconductor detectors with collimators [10].

Synchronous changes of the shape of histograms constructed from the results of measurements of [sup.90]Sr [beta]-Decay and [sup.239]Pu [alpha]-decay observed in more than 3000 km distant laboratories

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.

High temperature endurable fiber optic accelerometer

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.

Representative elementary length to measure soil mass attenuation coefficient

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.

Technical considerations of phosphorous-32 bremsstrahlung SPECT imaging after radioembolization of hepatic tumors: a clinical assessment with a review of imaging parameters

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.

Performance assessment of the single photon emission microscope: high spatial resolution SPECT imaging of small animal organs

The solar divergence collimator can be realized in axis (S1-S2) if the examined collectors have reduced dimensions.

Solar divergence collimators for optical characterisation of solar components

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.

Motors take on cancer

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.

Numbers, intelligence, manufacturing technology and machinery automation; proceedings

(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.

Assembly and clinical use of the XCP dental x-ray film holder orientation devices in dentistry

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.