collimation

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Related to Collimated light: collimation

collimation

 [kol″ĭ-ma´shun]
1. in microscopy, the process of making light rays parallel; the adjustment or alignment of optical axes.
2. in radiology, the elimination of the more divergent portion of an x-ray beam.
3. in nuclear medicine, the use of a perforated absorber to restrict the field of view of a detector and reduce scatter.

col·li·ma·tion

(kol'i-mā'shŭn),
1. The method, in radiology, of restricting and confining the x-ray beam to a given area and, in nuclear medicine, of restricting the detection of emitted radiations from a given area of interest.
See also: laser, coherence.
2. A characteristic of laser light, in which all rays are nondivergent. The combination of collimation, coherence, and monochromatism produces, over a long distance, a bright, precise, finely focused beam.
See also: laser, coherence.
[L. collineo, to direct in a straight line]

collimation

The process in which the spread of a beam or field of radiation is reduced with a lead diaphragm, tube, or cone.

collimation

Radiation physics The formal process in which a beam or field of radiation is reduced with a lead diaphragm, tube, or cone

col·li·ma·tion

(kol'i-mā'shŭn)
1. radiology The process of restricting and confining the x-ray beam to a given area.
2. nuclear medicine Restricting the detection of emitted radiations from a given area of interest.
[L. collineo, to direct in a straight line]

collimation 

1. The making of a bundle of light rays parallel.
2. In radiography, limiting the size of the beam to the required region on the patient, thereby protecting the remainder of the patient from radiation.

col·li·ma·tion

(kol'i-mā'shŭn)
The method, in radiology, of restricting and confining the x-ray beam to a given area and, in nuclear medicine, of restricting the detection of emitted radiations from a given area of interest.
[L. collineo, to direct in a straight line]
References in periodicals archive ?
In case the incident light is not a collimated light, intensity difference between second and third reflections is close to discrete step due to the presence of light block fixture, although the difference becomes less than the case for collimated incident light.
The single backward scattering model is probably applicable on distances shorter than 1/[[mu]'.sub.s] from the source in point illumination by collimated light and at certain scenarios in broad illumination by collimated light.
Alternatively, the image can be projected onto a nearby surface by the use of collimated light, such as that from a laser.
The brightness of the collimated light is inversely related to the cross section ("emittance") of the light-producing electron or positron beam.
At the Design Plus pavilion, combinations of the collimated light were shown with holographic diffusers that shaped the beam up to a 60:1 form factor, and with LensVector's liquid crystal lens technology, which enabled the beam to change its size dynamically.
The purpose of the numerical study will help the experiment which will evaluate for the optical modulation characteristics of a mono-atomic layer of graphene on a limited-band collimated light. Numerical results related to this effect and study will be presented.
The custom Fresnel lenses emit an even collimated light source that can be focused and controlled for maximum flexibility.
Unlike standard parabolic mirrors, off-axis parabolic (OAP) mirrors direct and focus incident collimated light at a specific angle, allowing unrestricted access to the focal point.
On 20 April it will launch a fundraising campaign on the Kickstarter website to raise funds for this move in to the consumer market, as well as to finance the latest generation of Voxgrams, a full colour, full parallax transmission hologram which can be viewed on the Voxbox or with other collimated light.