A common or single type of positron emission tomography (PET) coincidence processor is useable with different PET systems. The ports are configurable to operate with different coincidence algorithms, allowing different numbers of ports to be used in different systems. The ports are configurable to provide different outputs and/or connect with different types of detectors. A programming port allows programming of an appropriate coincidence algorithm so that different such algorithms are usable by the controller. Any one or more of these accessible and/or versatile features are provided on a controller.