Collimator meaning, synonyms, antonyms, translation, and use cases


Have you ever heard of the word collimator, If not, In todays word for the day, We will be giving a highlight on the meaning of collimator, its synonyms, antonyms, translation, and use  cases.


A Collimator is a tool for converting a point source’s divergent radiation into a parallel beam. To perform specific measurements in spectroscopy, geometrical optics, and physical optics, the light must be collimated.

A collimator is a tool that constricts a particle or wave beam. To narrow is a technical term that refers to either making the motion directions more parallel or collimated in a particular direction or reducing the spatial cross section of the beam (beam limiting device).

They are used to specify the directionality of radioactivity, i.e., to reject all photons traveling in the wrong direction and only permit those traveling at the proper angle to reach the detector.

An optical collimator is made up of a tube with a convex lens at one end and a variable aperture at the other end that is located in the lens’ focal plane. To examine the image without parallax, radiation entering the aperture exits the collimator as a parallel beam.


Types of collimators

Pinhole and multihole collimators are the two fundamental varieties.

pinhole collimator

It is similar to a box camera’s operation. To image radiation, it must travel through the pinhole aperture, and the picture displayed on the scintillation crystal is always inverted.

The pinhole collimator has very poor sensitivity because only a small portion of the radiation originating from the item of interest is allowed to pass through the pinhole over a specific time period. The proportion of light photons that pass through the collimator is referred to as collimator sensitivity.

 Multihole collimator

It can be aligned parallel, divergent, or convergent. The most used multihole collimator in nuclear medicine facilities is the parallel hole collimator. It is made up of parallel holes with a long axis that is perpendicular to the scintillation crystal’s plane. The Septa are the lead walls that separate the holes.


Varieties of collimator

Optical collimators

In optics, a collimator is a mirror or lens that has a light source or an image focused on it. This enables parallax-free replication of a target at infinity. The alignment of two or more optical instruments, such as binoculars and gun barrels or gun sights, can be accomplished with the aid of optical collimators.

They can also be used to calibrate other optical devices.

To show the user a reticle at infinity, optical collimators are also employed in gun sights and other pointing devices.
Both CO2 cutting lasers and laser diodes can be utilized with collimators.
A shearing interferometer test can be used to confirm if a laser source’s collimation is correct and has a long enough coherence length.

Collimators for X-rays, gamma rays, and neutrons

A collimator is a device that filters a stream of rays such that only those moving parallel to a specific direction are allowed through in neutron, X-ray, and gamma ray optics. Because it is currently not possible to focus radiation with such short wavelengths into an image by the use of lenses as is common with electromagnetic radiation at optical or near-optical wavelengths, Collimators are employed in neutron, X-ray, and gamma-ray optics.

Beam collimators

Its also known as “beam direction” devices, are placed in the housing of the x-ray tube together with a configuration of mirrors and lights to align the light and x-ray fields. They are made of lead shutters that totally absorb the photons, lowering the patient dose and directing the radiation in the desired location. They enable various x-ray field projections.


  • Telescope
  • Optical device
  • radar
  • Prism
  • Telescope


  • Distort
  • Diverge
  • Imbalance



Spanish- colimador
Latin- collimator
Greek- παραμετροποιητής
French- collimateur
Portuguese- colimador


First Known Use

The word was first recorded in 1815–25


Use Cases

  • In order to define the aperture and shape the beam’s distal end, this approach depends on one or more scatter foils for lateral beam broadening and appropriately constructed collimators and compensators.
  • The middle of the field is offset from the central ray of the beam in order to determine the collimator position.
  • The determination of the offset of separate collimators in asymmetric fields continued to be a significant source of mistakes.


Frequently Asked Question

What do the collimator and eyepiece do?

The incoming light beam is collimated using a COLLIMATOR. It is made up of a biconvex lens that focuses light in one direction and creates a parallel beam of light.

What does x-ray Collimation mean?

Collimation: Using lead shutters within the x-ray tube, It confines the x-ray beam to the area of interest. It also lessens the amount of off-focus radiation that reaches the film, which is an additional positive effect. Less scatter radiation is created because less tissue is being exposed to radiation.

What substance serves as a Collimator?

Due to its high density, lead is the material that Collimators are made of most frequently.

Why is Collimation used in radiography?

For reasons related to patient dose and image quality, X-ray beam collimation is crucial for radiography and fluoroscopy projection imaging.

Radiation danger is minimized by actively collimating to the volume of interest, which lowers the patient’s overall integral dosage.

Video Explanation of Collimator

This video will give you a further explanation of the meaning of collimator and the history of collimator.



Collimator provides us with a comprehensive array of options that encourage exploration, education, adaptation, and ongoing iteration. Engineers for perception, planning, and control systems can collaborate in one location.

The model is once again our only reliable source of information, and V&V is simpler than ever.
One of the components of optimizing the radiographic imaging procedure is proper Collimation. By producing less scatter radiation from these locations, it reduces the need to expose anatomy outside the area of interest and enhances image quality.




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