Patent ID: 8270561

Claim:
A method of weighting projection data in a computed tomography (CT) system, comprising the steps of: acquiring projection data using a cone beam along a circular trajectory in the CT system; determining a weight value according to a normalized electrocardiogram gated reconstruction (EGR) weighting function, w EGR (β,γ) based upon an EGR weighting function u EGR (φ(β)) at a cardiac phase φ and a view angle β, said u EGR (φ(β)) being normalized by a summation of u EGR (φ(β n C )) from n=−N PI to n=N PI for complementary view angles (β n C ) during the cardiac phase φ, wherein said determining step determines said weight value according to a FB+EGR weighting function w FB+EGR (β,γ) based upon said u EGR (φ(β)) and a fan beam (FB) weighting function u FB (β) at the view angle β, a product of said u EGR (φ(β)) and said u FB (β) being normalized by the summation of a product of u FB (β n C ,γ n C ) and u EGR (φ(β n C )) from n=−N PI to n=N PI for the complementary view angles (α n C ) and complementary fan angles (γ n C ); and weighting each of the projection data by said weight value as determined by said w EGR (β,γ) for the CT system, where γ is a fan angle of the cone beam.