NUCLEAR MEDICINE IMAGING APPARATUS AND INITIAL SCATTERING POSITION DETERMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a PET apparatus for improving a S/N ratio of an image by suppressing the effect of random coincidence (random) during emission imaging even if a time window cannot be narrowed by using a radiation detecting element as a semiconductor detecting element without a sufficiently-short temporal resolution. SOLUTION: The nearest event relative to a central axis of an opening is selected among a plurality of the events within a detected event group identifying area 73 detected by a radiation detector within a detector area 4B. An estimated scattering angle related to the event and an angular error of the estimated scattering angle are estimated based on detected energy of the event and a detected energy error. It determines whether a detected position of the event is an initial scattering position or not based on the detected position of the event, the estimated scattering angle and the angular error. The event which is not the initial scattering position is prevented from being processed as the initial scattering position. COPYRIGHT: (C)2010,JPO&INPIT