What does a gamma camera measure?
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The performance of a gamma camera system is defined by the sharpness and detail of the images it produces, the efficiency with which it detects incident radiation, its ability to measure the energy of the incident γ rays (to minimize scatter), and the counting rate it can handle without significant dead time losses.
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The gamma camera is made to scan the area of interest approximately four hours after the patient has been injected with the radioactive tracer. This gives it time to circulate and accumulate in 'hot-spots' of rapid cell division.
The Gamma Camera will track the radioisotope in the area to be scanned and will measure how the part processes it. There are multiple types of diagnostic scans performed by the Gamma Camera. Types of scans
The gamma camera can be used for static imaging studies, in which an image of an unchanging radionuclide distribution can be recorded over an extended imaging time (e.g., minutes). Single contiguous images of the whole body can be obtained by scanning the gamma camera across the entire length of the patient.
The gamma camera, also called scintillation camera, is the most commonly used imaging device in nuclear medicine. It simultaneously detects radiation from the entire FOV and enables the acquisition of dynamic as well as static images of the area of interest in the human body [67] .
A gamma photon that scatters within the patient will never hit the scintillator with the full energy (i.e. it won't lie within the peak). Therefore, only gamma photons in the peak can be confidently identified as non-scattered radiation from the patient. Usually a 20% acceptance window is used centred on the photopeak. The acceptance window can be adjusted and more than one window can be used for radionuclides that have more than one photopeak (e.g. indium-111 has peaks at 172 and 247 keV).
As its name suggests, a 'gamma camera' detects scintillations produced by gamma rays emitted by a radioactive marker. The impact of these gamma rays on a sodium iodide crystal generates scintillations that are detected by photomultipliers.
A gamma camera is a piece of medical equipment that is capable of detecting gamma radiation. The radiation can be recorded on film or displayed on a monitor. These devices are used in medical imaging studies that are designed to show doctors what is happening inside a patient's body. Such procedures are minimally invasive and can be performed ...
Gamma Camera Operation γ γ. Array of Photomultiplier Tubes (PMTs): Localizes the position where the gamma ray. interacts in the crystal. Sodium Iodide crystal: A gamma ray from the patient interacts. and produces visible light photons. Collimator: Forms a projection image by. allowing only gamma rays traveling. in certain directions to reach crystal (for