1. A method for iteratively reconstructing an image, the method comprising: acquiring, with a detector, computed tomography (CT) imaging information; generating, with at least one processor, sinogram information from the CT imaging information; generating, with the at least one processor, image domain information from the CT imaging information; updating the image using the sinogram information; and updating the image using the image domain information, wherein the updating the image using the sinogram information and updating the image using the image domain information are performed separately and alternately in an iterative fashion.