Patent ID: 6459756
Filing Date: 2002-10-01
Classification: A61B,G06T,Y10S

Abstract:
A method for image reconstruction in a spiral scan imaging system, comprising the steps of:acquiring cone beam projection data for a 1/n reduced-pitch spiral scan of a ROI (region of interest) of an object, wherein the step of acquiring comprises applying radiation from a cone beam source towards the object from a plurality of source positions along the 1/n reduced-pitch spiral scan path that encircles the ROI, and acquiring a set of cone beam projection data on an area detector, the set of cone beam data corresponding to a respective portion of the ROI at each of said source positions; identifying a set of integration planes that intersect the ROI and that intersect the 1/n reduced-pitch spiral scan path at Mcomputing a contribution of cone beam image data for the identified set of integration planes; computing a correction factor for the identified set of integration planes and adding the correction factor to the cone beam image data associated with the identified set of integration planes so as to increase the S/N (signal-to-noise) ratio; reconstructing an image of the ROI using the corrected cone beam image data.