Collimator definition

Collimator means a radiation shield that is placed on the end of the guide tube or directly onto a radiographic exposure device to restrict the size of the radiation beam when the sealed source is cranked into position to make a radiographic exposure.
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Collimator means a device or mechanism by which the x-ray beam is restricted in size.
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Collimator means a device used to limit the size, shape, and direction of the primary radiation beam. For industrial radiography it means a radiation shield that is placed on the end of the guide tube or directly onto a radiographic exposure device to restrict the size of the radiation beam when the sealed source is cranked into position to make a radiographic exposure.
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Examples of Collimator in a sentence

  • A Laser diodeFObjective lensB Collimator lensGOptical diskC Optional shaping prismHSplit photodetectorD Polarizing beamsplitterI1, I2Outputs currents from the split photodetectorE Quarter-wave plateK1, K2d.c.-coupled amplifiers Figure 1 – Optical system of the Reference Drive The combination of the polarizing beamsplitter D and quarter-wave plate E separates the incident optical beam and the beam reflected from the optical disk G.

  • Collimator blurring and intrinsic detector blurring can be modeled by a distance- dependent camera point spread function ( ).

  • A Mini Multileaf Collimator (MMLC) of 4 mm leaf thickness and 10x12 cm maximum field size at the isocentre is also used for stereotactic 3D conformal and IMSRT techniques for treatment of larger lesions.

  • Heydarian M, Sadrolhefazi B, Fung B, Ringash J and Cummings BPrincess Margaret Hospital, University Health Network, University of Toronto, Toronto, Ontario, CanadaRadionics treatment planning and delivery systems, including a Mini Multileaf Collimator (MMLC) are routinely used at our institution for intensity modulated stereotactic radiotherapy (IMSRT) of intracranial lesions.

  • Collimator setting (cm)Direction Measured FWHM (cm) Elekta (MLC fields)Varian (jaw fields) ABCDEF1.00Crossplane1.061.130.980.901.031.01 Inplane1.000.971.040.880.920.942.00Crossplane2.072.071.981.912.052.02 Inplane2.011.962.021.851.901.923.00Crossplane3.053.083.002.933.063.03 Inplane3.042.983.032.852.912.93Table 7.


More Definitions of Collimator

Collimator means one of the following:
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Collimator means a device for restricting the useful radiation in one or more directions.
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Collimator means a device used to limit the size, shape, and direction of the primary radiation beam.
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Collimator means a device or mechanism by which the x-ray or gamma-ray beam is restricted in size.
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Collimator means a radiation shield of lead or other heavy metal which is placed on the end of a guide tube or directly onto a radiographic exposure device to restrict the size and shape of the radiation beam when the sealed source is moved into position to make a radiographic exposure.
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Collimator means a device used to limit the radiation field. Beam-limiting devices are specific types of collimators.
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Collimator means a device or mechanism by which the x-ray beam is restricted in size (see "Beam-limiting device").
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