What is gamma camera in radiography?
Gamma cameras (also called scintillation cameras or Anger cameras) are the predominant nuclear medicine imaging machine currently in use. They permit the acquisition of planar images. They are also central to single photon emission computed tomography (SPECT).
What does gamma camera detect?
The gamma camera or SPECT camera is a camera that is able to detect scintillations (flashes of light) produced when gamma rays, resulting from radioactive decay of single photon emitting radioisotopes, interact with a sodium iodide crystal at the front of the camera.
What is the principle of gamma camera?
1. The Anger gamma camera. The principle of radiation detection is based on the interaction of these radiations with the matter. When a gamma photon enters in interaction with a detector material, it loses its energy mainly in the form of ionizations or excitations.
What are the main components of a gamma camera?
The main components of a gamma camera are:
- the sodium iodide crystal;
- the collimator; and.
- the photomultiplier tubes.
What are the parts of a gamma camera?
The basic components of gamma camera are collimator, scintillation crystal, photomultiplier tubes, and electronic circuitry including preamplifiers, amplifiers, and multichannel analyzers along with analog to digital converters.
What crystals are used in gamma cameras?
Sodium iodide
Sodium iodide (NaI) is the most common crystal used in gamma cameras.
How does a gamma camera produce an image?
Gamma cameras are made of a crystal (sodium iodide) which produces a burst of light when gamma rays hit it. Light is picked up by detectors (photomultiplier tubes) located behind the crystal. Electrical output from detectors is fed to computer to produce image.
How the gamma camera operates to perform its function?
Nuclear medicine uses a special gamma camera and single-photon emission-computed tomography (SPECT) imaging techniques. The gamma camera records the energy emissions from the radiotracer in your body and converts it into an image. The gamma camera itself does not emit any radiation.
What are gamma ray telescopes used for?
Gamma ray telescopes are used to verify various phenomena, such as black holes and pulsars. Reflecting telescopes provide incredibly detailed images of distant objects in the universe, including faraway galaxies, nebulae and dying stars.
What does Spectrometry, gamma mean?
Gamma spectroscopy is the study of the energy spectra of gamma ray sources, such as in the nuclear industry and geochemical investigation. The gamma spectrum is characteristic of the gamma-emitting nuclides contained in the source. Radiation Dosimetry
What are the disadvantages of spectroscopy?
The main disadvantage of using a UV-VIS spectrometer is the time it takes to prepare to use one. With UV-VIS spectrometers, setup is key. You must clear the area of any outside light, electronic noise, or other outside contaminants that could interfere with the spectrometer’s reading.
What are the uses of gamma radiation?
In a controlled procedure, gamma rays are employed as a “gamma knife” consisting of multiple concentrated beams of gamma rays that are focused directly onto a tumor to kill the cancer cells while leaving the surrounding cells unharmed. Gamma rays have also been used to sterilize equipment as an alternative to chemical treatments.