The imaging systems used in PET scans have several errors that are a result of nonlinearity. Positron range, which is the distance traveled by the positron before reaching the detector, varies and may result in mispositioning in these scans. The interaction between the photons emitted in PET and tissues is also discussed in the article. Also, the chapter discusses the interaction of these radionuclides with other materials such as tungsten and lead (Cherry and Dahlbom 17). The interactions were grouped into Compton scattering, the photoelectric effect, and pair production.
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