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(a) The detector stack consists of an interface board, the sensor tile and a pixelated scintillating crystal array mounted on a light guide (© [2012] IEEE. Reprinted, with permission, from Weissler et al (2012)). (b) The singles detection module is able to house up to six stacks. Only one detector stack is mounted to reveal the cooling pipes (reprinted from Wehner et al (2014)).
