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 ?

We achieved the same sub-millimeter precision we've come to rely on with the CyberKnife System, in 20 minutes, so half the time compared to previous treatment session using another collimator.

Munich CyberKnife Center Is a Pioneer in Offering Most Advanced Radiosurgical Tumor Treatment

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

Using the data of the small angle scattering process that was obtained, a multi-diaphragm collimator has been designed.

Project of neutron beta-decay A-asymmetry measurement with relative accuracy of (1-2) X [10.sup.-3]

In addition, a new device, the multileaf collimator, allows for the collimation of the x-ray beam during treatment.

Recent advances in radiotherapy for head and neck cancers

FDA 510(k) clearance was granted to Varian's Millennium MLC-120 multileaf collimator (MLC), a device used with its medical linear accelerators for increasing the cancer-killing energy directed at tumors, while minimizing the radiation dose to surrounding healthy tissue.

VARIAN GETS FDA MARKET CLEARANCE FOR BEAM SHAPING DEVICE

The InCise MLC is the world's first multileaf collimator to be available on a robotic platform, the CyberKnife M6 System.

Accuray Initiates International Commercial Launch of the InCise(TM) Multileaf Collimator for the CyberKnife M6(TM) System

The smallest possible distance between the collimator (camera head) researcher and institution (.

Providing of Medical equipments

When collimators were West and East directed no synchronism by absolute time between Puschino and Novolazarevskaya was noticed.

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

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.

VARIAN DEBUTS BEAM-SHAPING SYSTEM FOR RADIOTHERAPY TREATMENTS

3 Equinox effects in the data obtained with collimators

Histograms constructed from the data of [sup.239]Pu alpha-activity manifest a tendency for change in the similar way as at the moments when the Sun, the Moon, Venus, Mars and Mercury intersect the celestial equator

The thermal neutron background component from the thermal and epithermal neutrons multiply scattered on collimators will depend on the collimation system.

Direct nn-scattering measurement with the pulsed reactor YAGUAR

Providing clearer images at a higher resolution than traditional single or multi-pinhole collimators, this advanced Single Photon Emission Computed Tomography (SPECT) solution could allow researchers to more quickly and accurately image new diagnostic and therapeutic compounds in preclinical studies.

Better Vision with Multi-Pinholes: Siemens and Cleveland Clinic Sign Licensing Agreement; New Technology to Offer Clearer, Faster Images in Preclinical SPECT Applications