| abstract |
A PET scanner includes a coincidence detector circuit which compares time markers produced by a ring of detector modules. Detector module outputs are sampled every 250 nanoseconds and assembled into event data packets which are time multiplexed through the coincidence detector circuit. The coincidence detector circuit is formed around a set of ASICs which perform the comparisons necessary to detect coincidence events. Coincidence event data packets are sorted into sinograms and used to reconstruct images. |