GEOMETRICAL TRANSFORMATIONS PRESERVING LIST-MODE FORMAT

摘要

A diagnostic imaging device includes detector elements (16) for detecting gamma-rays indicative of nuclear decay events. The detected gamma-rays are used to produce lines of response (LORs) (46), which are time stamped (20) and stored in list mode. The LORs are reconstructed (34) into an image. An image analysis processor (38) analyzes the image for motion artifacts and iteratively adjusts an event transform processor (30) to transform selected LORs to minimize the motion artifacts. If the transformed LOR (50) does not correspond with a pair of detector elements (16), closest detector elements (52, 54) are determined. Candidate LORs (62) are created between the closest and neighboring detector elements. An event location (40) on an LOR (46) is determined from the time-of-flight (TOF) information and then transformed (47) to generate a transformed event location (48). The candidate LOR (62) which most nearly intersects the transformed event location (40) and the appropriately updated TOF information is selected for use in image reconstruction.