Patent Document ID: 8013307
Application ID: 11721722
Patent Status: 1

Claim One:
1. An imaging system comprising: at least one radiation detector disposed adjacent a subject to detect and measure at least one of emission and transmission radiation from a subject, the detector being movable around the subject to receive the radiation and generate measured projection data at a plurality of projection angles; a FOV means for determining a plurality of pixels which belongs to a field of view of the radiation detector at each projection angle; an image processor which iteratively reconstructs the radiation detected only in the field of view into image representations, the image processor including: a forward projector which projects the image representations from the corresponding image memory; a means for comparing the forward projected image representations with the measured projection data and, based on the comparison, determining a set of correction factors; and a backprojector for backprojecting the correction factors, which correspond only to the pixels within the determined field of view, into the image representations; and an image memory in which the image representations are iteratively reconstructed.