Patent ID: 6510241
Filing Date: 2003-01-21
Classification: A61B,G06T

Abstract:
A process for reconstructing a three-dimensional image of an object from a set of numbered projected two-dimensional images of the object obtained from various positions of an imaging around the object, comprising the steps of generating a calibrating a virtual volume surrounding the object and broken down into voxels acquiring the set of numbered projected two-dimensional images, and reconstructing the three-dimensional image from the projected acquired two-dimensional images and from an iterative algebraic image reconstruction algorithm, wherein a first iteration of the algorithm is performed with a predetermined initial image resolution so as to obtain, at the end of this first iteration, first density values for the voxels of the volume, at least one part of the voxels of the virtual volume is subdivided into several sets, respectively, corresponding to different image resolutions that are multiples or sub-multiples of the initial resolution, and during each subsequent iteration of the algorithm, the algorithm is successively applied to each of the sets of voxels.