METHOD AND DEVICE FOR DETERMINING COINCIDENCE IN PET DEVICE

摘要

In the coincidence determining processing in a PET device which counts a pair of annihilation rays detected within a given time as being generated from the same nuclide, when a plurality of coincidences are detected within a given time, the priority for the line of coincidence to be collected is set using information pertaining to the detection time difference, and the true coincidence is extracted from the multiple coincidences. Thus, the true coincidence is extracted from the multiple coincidences which had been discarded in the past, thereby enhancing detection sensitivity in the case of high radioactive concentration while improving dynamic range.