COMPUTER-IMPLEMENTED METHOD OF DERIVING 3D IMAGE DATA OF A RECONSTRUCTION VOLUME AND COMPUTER READABLE MEDIUM

A computer-implemented method of deriving 3D image data of a reconstruction volume from a plurality of 2D projections by way of filtered back-projection is disclosed. An embodiment of the method includes receiving a plurality of 2D projections of an imaged object, each 2D projection corresponding to a projection plane; applying a filter to each of the 2D projections to yield filtered 2D projections; calculating a filtered back-projection density distribution from the filtered 2D projections; calculating at least one modified filtered back-projection density distribution indicative of outlier values included in the filtered 2D projections; and calculating a revised filtered back-projection density distribution as a weighted linear combination of the filtered back-projection density distribution and the at least one modified filtered back-projection density distribution.