What are the components of a gamma camera?
What are the components of a gamma camera?
The major components of typical gamma camera are hardware collimator, scintillation crystal, PMTs, preamplifier, amplifier, pulse height analyzer (PHA), position circuitry, computer system for data acquisition including signal processing and correction, and ultimately a monitor for image display and analysis.
How does a gamma camera work step by step?
The procedure involves giving the patient a radiopharmaceutical molecule marked with a gamma-emitting radioisotope. Once the molecule fixed on the target organ or tissue, the highly penetrative emitted gamma rays easily escape from the body and leave their mark on the detection panels.
What radiation is used in a gamma camera?
Unsourced material may be challenged and removed. A gamma camera (γ-camera), also called a scintillation camera or Anger camera, is a device used to image gamma radiation emitting radioisotopes, a technique known as scintigraphy.
What does the crystal do in a gamma camera?
The detection element at the heart of a gamma camera is a large rectangular crystal of sodium iodide doped with thallium: NaI (Tl). The crystal has the ability to stop incoming gamma rays and convert part of the deposited energy into scintillations.
What is a gamma camera crystal made of?
The gamma camera employs a sodium iodide crystal that is relatively thin in comparison with most other sodium iodide detectors used in nuclear medicine: 6.4 to 12.7 mm versus 2 to 5 cm for probe counting systems, scanners, and so on.
Which of the following is not a component of gamma camera?
Which of the following is not a component of gamma camera? Explanation: Pre-amplifier is not a component of gamma camera. It is an imaging device commonly used in medical applications.
What is a collimator in a gamma camera?
A collimator is the first processing layer of a gamma camera to encounter photons from radioactive source. It restricts the rays from the source so that each point in the image corresponds to a unique point in the source.
Does a gamma camera rotate?
(a) The gamma camera is rotated around the patient and a series of images are taken from different angles. (b) To reconstruct a transaxial slice a row of data in each image is backprojected. The data in each row is shown in profile; the height of the curve represents the count density in the image.
Why is sodium iodide used in gamma camera?
Sodium iodide (NaI) is the most common crystal used in gamma cameras. It is favoured due to the following properties: high atomic density. high light output.
Which of the following is known as a scintillation counter?
In liquid scintillation counter, which of the following is used to convert light into electrical signals? Explanation: The photo multiplier tube converts light into electrical signals in a liquid scintillation counter. Two photo multiplier tubes are used in the liquid scintillation counter.
When the energy of unabsorbed gamma photon is released a flash of light is produced This is similar to which of the following effects?
5. When the energy of an absorbed gamma photon is released, a flash of light is produced. This is similar to which of the following effects? Explanation: The given effect is similar to the photoelectric effect.