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Quarter-trio mapping (QTM) is a new detector readout scheme for avalanche-photodiode (APD) block detectors in positron emission tomography (PET). This design simplifies the detector readout electronics, and more efficiently utilizes APDs in detector blocks hence reducing cost. With the QTM design, eight APDs are positioned in each detector block. The APDs are positioned in such a way that 12 times...
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