Cyclic signal e.g. cardioid curve, determining method for use during tomography scanning of e.g. heart of small animal, involves deriving cycle signals from individual cycle-phases depending on acquisition time of image acquisitions

摘要

The method involves generating an average volume image from image data of a volume region including a cyclically movable object (1). Cycle-phases of object movement in individual image acquisitions are derived from comparison of the image acquisitions with the average volume image. Cycle signals are derived from the individual cycle-phases depending on acquisition time of the image acquisitions, which are associated to the cycle-phases. A virtual projection image is derived from the average volume image for projection direction. Independent claims are also included for the following: (1) a determining module for determining cycle signals representing cyclic movement of a movable object (2) a signal-extraction module for extracting trigger signals for acquisition of raw image data and/or for processing of used image data of a tomography system (3) a computer program product comprising instructions for performing a signal-extraction method and/or an image acquisition method.