PET systems exhibit many variations in design. At the most fundamental level, different scintillators are used. The configuration of the system also varies greatly from restricted axial field of view, discrete (block-detector) systems to large, open, 3D designs. With such a range of variables, assessing performance for the purposes of comparing the capabilities of different scanners is a challenging task.
In this section, a number of the determinants of PET performance are discussed. New standards for PET performance have been published which may help to define standard tests to make the comparison of different systems more meaningful .
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