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

/col·li·ma·tion/ (kol″ĭ-ma´shun)
1. in microscopy, the process of making light rays parallel; the adjustment or aligning 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.

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

confinement of an X-ray beam, ensuring that radiation reaches only the area of interest, and unnecessary tissue exposure is avoided

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]

collimation (kol´imā´shən),

n in radiology, collimation refers to the elimination of the peripheral (more divergent) portion of a useful radiographic beam by means of metal tubes, cones, or diaphragms interposed in the path of the beam. See also diaphragm.
collimation, rectangular,
n a method for minimizing a patient's exposure to unnecessary radiation during treatment by using a rectangular position-indicating device (PID) to reduce the size of the radiation beam.

collimation

in microscopy, the process of making light rays parallel; the adjustment of two or more optical axes with respect to each other. In radiology, the restriction of the beam size to the area under investigation. This reduces the scattered radiation reaching the x-ray film and the exposure of attendants.
References in periodicals archive ?
The micrometer employs a dual telecentric lens to create uniform collimated light with a green LED.
A method and apparatus for inspection of a security article (10) is provided in which a substantially collimated light beam (15) from a point light source (14) is directed onto a diffractive optical projection element (DOE) (11).
Moreover, due to a highly collimated light source and a unique photodetector array, this module is extremely tolerant to mounting misalignment.
Alternatively, the image can be projected onto a nearby surface by the use of collimated light, such as that from a laser.
Moreover, due to the highly collimated light source and the unique photo detector array design, the AEDx-8xxx is extremely tolerant to mounting misalignment.
In addition, the encoder module incorporates a highly collimated light source and a unique photo detector array to make the AEDS-9240 extremely tolerant to mounting misalignment.
Combining a highly collimated light source and a unique photodetector array, the module is extremely tolerant to mounting misalignment.