Do gamma cameras emit radiation?
Do gamma cameras emit radiation?
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. It has radiation detectors called gamma camera heads.
When would a gamma camera be used?
Diagnostic Procedures 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].
What is sensitivity of gamma camera?
Sensitivity of a gamma camera is defined as the number of counts per unit. time detected by the device for each unit of activity present in a source. It. is normally expressed in counts per second per microcurie (cps/mCi).
What is the efficiency of the gamma camera?
The gamma camera is nearly 100% efficient for energies up to approximately 100 keV for all crystal thicknesses, but then shows a rather marked decrease in efficiency at higher energies, depending on crystal thickness.
How does a gamma camera work?
Gamma Camera and SPECT Gamma cameras are based on the detection of gamma rays emitted from radionuclides. Radionuclides can be ingested or injected into the body. The camera accumulates counts of gamma photons, which are detected by crystals in the camera.
Is the field uniformity of a gamma camera affected by asymmetric windows?
Unfortunately, with most gamma cameras significant nonuniformities are produced when the window is changed to an asymmetric setting. Recently introduced designs with gain stabilization of the photomultiplier tubes and improved energy correction maintain field uniformity even for an asymmetric window.
How does pile-up correction work in gamma cameras?
Many gamma cameras now incorporate circuits that continuously monitor the decay of a pulse and use a method based on pulse-tail extrapolation for pile-up correction. Consider two γ-ray interactions that occur close together in time and create overlapping pulses.
