Patent ID: 7573973
Filing Date: 2009-08-11
Classification: A61B,G06T

Abstract:
1. A computer programmed to generate computed tomographic (CT) images from a set of projection data acquired during a CT scan, said computer programmed to: perform a cone-angle-and-image-plane-dependent view weighting, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane; apply a Feldkamp, Davis, and Kress (FDK) algorithm with the cone-angle-and-image-plane-dependent view weighting to the set of projection data; apply an FDK algorithm to a single circular source trajectory expressed as: where w(X) represents at least one of:  where β represents view angle; ƒ (x,y,z) represents the point to be reconstructed; P d represents the orthogonal distance between the x-ray focal spot and the virtual detector; Z represents the height of the projection of ƒ(x,y,z) in the virtual detector; ω represents frequency; α_≡α(x,y,z) that represents the cone angle of the ray emanating from the focal spot and passing through a point P, wherein α(x,y,z) is dependent on a coordinate (x,y,z) of the point P; l≡l(z) that represents an orthogonal distance between an imaging plane (IP) and a central plane (CP), wherein l(z) is dependent on a z-coordinate of the point P g(l) is a positive monotonically increasing function over distance l; α ν and ν