1. A method of weighting projection data, comprising the steps of: acquiring projection data using a cone beam along a circular trajectory; 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; and weighting each of the projection data by said weight value as determined by said w EGR (β,γ), where γ is a fan angle of the cone beam.