1. A method for producing an image of a subject with an x-ray imaging system, the method comprising the steps of: a) acquiring, with the x-ray imaging system, an image data set along a series of projection views at each of a plurality of projection view angles; b) producing a prior image of the subject by reconstructing each line in an corresponding image matrix using an iterative estimation process in order to form a prior image in which truncation artifacts are substantially suppressed; c) selecting an estimate image of the subject; d) producing a sparsified image of the subject using the prior image and the estimate image; and e) reconstructing a desired image of the subject using the sparsified image, the estimate image, and the acquired image data set.