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collimator

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.12 sec.
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.

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.

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.


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In a typical application, a panoramic x-ray source that emits a fan beam of x-rays in an angle >180[degrees] is inserted inside of the tire under inspection and aligned with the internal collimator aperture opening.
When you do weekly PMCS, get the collimator out and make sure its knobs still work and the leveling bubble moves.
 
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