Patent ID: 6888915
Filing Date: 2005-05-03
Classification: G06T,Y10S

Abstract:
1. Process for reconstruction of an image of a moving subject, including taking a set of successive measurements of the subject on projection rays passing through the subject, through a network ( 4 ) of detectors ( 5 ) at corresponding incidences around the subject, a measurement back projection step and a correction step following a subject change law, characterised in that the back projection step is made in several steps to give corresponding blocks (f b ) of back projection results, each of the blocks grouping projection rays taken only for an angular sector of a turn of the detectors network using measurement quantities that are insufficient to genuinely express the required image; the subject change law is estimated based on the first images obtained by accumulating back projection blocks on at least half a turn of incidences of the detectors network; and the back projection result blocks are combined after they have been corrected using the subject change law to give the image at a reference time (t r ).