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 ?

Other products include: a 52-leaf multileaf collimator; an 80-leaf model to meet the majority of a center's radiotherapy needs; and the BrainLAB m3, the ultra-fine Micro-MLC for stereotactic radiosurgery.

VARIAN GETS FDA MARKET CLEARANCE FOR BEAM SHAPING DEVICE

Laser collimators also require some distance in front of the muzzle.

"BORE-SIGHTERS": THERE'S MORE TO THEM THAN MEETS THE EYE

The near-day periods of similar histograms were not registered when the light beam coming from a LED, or the alpha-particle beam coming through a collimator are directed to Polaris (this effect was registered in Puschino, Russia).

On the Cosmophysical origin of random processes: open letter to the scientific community on the basis of experimental results obtained during 1954-2014

Varian (NYSE:VAR), Palo Alto, Calif., 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. The new Millennium MLC-120 offers the best field-shaping solution for standard radiotherapy and is especially effective for small shapes such as head and neck tumors.

VARIAN DEBUTS BEAM-SHAPING SYSTEM FOR RADIOTHERAPY TREATMENTS

Film packets were coded according to film speed, collimator, exposure series, and model prior to exposure.

Effects of beam collimation on image quality

These days some collimators are pretty inexpensive, especially those that magnetically attach to the rifle's muzzle rather than use arbors.

Rough zero: a collimator begins saving time, effort and money quickly

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.

Synchronous measurements of alpha-decay of [sup.239]Pu carried out at north pole, antarctic, and in puschino confirm that the shapes of the respective histograms depend on the diurnal rotation of the earth and on the direction of the alpha-particle beam

With standard laser collimators, a doughnut-shaped paper reinforcing ring works well, but a simple spot with no hole is fine for the procedure described here.

Collimation with a Barlowed Laser

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.

Dependence of changes of histogram shapes from time and space direction is the same when fluctuation intensities of both light-diode light flow and [sup.239]Pu alpha-activity are measured

The collimators and focusing beam-shaping devices for optical systems are suited for a range of wavelengths.

Collimators and focusing devices cover range of wavelengths

The size of the beam entering the detector after passing through the specimen is controlled by selecting one of seven collimators, ranging in area from 0.0393 [mm.sup.2] to 9.0 [mm.sup.2] (Table 2).

Determining the uncertainty of x-ray absorption measurements

LaserMax also sells a pattern generator and adapter - the TLC-22 ($95) - for use on other brands of laser collimators. The device projects the pattern onto the telescope's secondary and primary mirrors, which reflect it out the front of the telescope tube.