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For many years most PET scanners had used a large number of crystals with some form of light sharing technique to couple them to four photo-multipliers (PMT). While the resolution of the scanners was improved by using more smaller crystals, the PMT size had remained about the same since it is not practical to make PMTs very small. Avalanche photo-diodes (APD) and silicon photo-multipliers (SPM) are...
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