1. A method of substantially reducing cone beam artifacts, comprising: a) providing a first image as generated from data obtained from cone-beam circular scan; b) differentiating the first image to generate differentiated image; c) forward projecting the differentiated image to generate differentiated line data; d) convoluting the differentiated line data to generate the convolved data; e) back projecting the convolved data to generate a second image; and f) correcting the first image based upon the second image to generate a corrected image.