The other type of detection system that was used in PET scanners is the block detector readout (Cherry and Dahlbom 23). A scintillator material with multiple segmented materials is applied in these detection systems that were in use in the early 21st century. The other factor in PETs that are discussed in the chapter is coincidence detection (Cherry and Dahlbom 23). In one of the simpler coincidence detection systems, a coincidence event is recorded when the 511keV photons interact with either of the detectors. Detection events are minimized by keeping the pulses as narrow as possible. In addition, the time window that is utilized determines the detection of these events. The article discusses some of the important applications of the PET scans and the errors that may occur in the decay process leading to the production of the 511keV photons.
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