Patent ID: 6643392
Filing Date: 2003-11-04
Classification: G06T

Abstract:
A process for reconstructing a tridimensional image of an object moving with a substantially cyclic motion, in which, for an acquisition duration extending over several cycles of the movement of the object, an acquisition of a plurality of initial digital radiographic images (IMi) is performed using a snapshot apparatus rotating around the object, initial images having the same temporal occurrence in the course of each cycle are selected respectively in successive cycles in such a way as to form a group of images which is associated with this same temporal occurrence, several different groups of initial images corresponding respectively to several different temporal occurrences are formed, an intermediate tridimensional representation of the object (RTi) is reconstructed on the basis of each group of initial images and of an iterative image reconstruction algorithm, a law of spatial deformation (LDIj) between two intermediate tridimensional representations is formulated on the basis of the two intermediate tridimensional representations corresponding to two successive temporal occurrences, and a final tridimensional representation of the object is reconstructed on the basis of the initial images successively acquired, of the spatial deformation laws successively formulated and of an iterative image reconstruction algorithm.