1. A low-dose x-ray preview image method, comprising: performing, by at least one processor, an initial scan of a patient at a pre-selected amount of x-ray exposure with an x-ray imaging device; creating, by the at least one processor, at least one initial image projection of said patient based on said initial scan; injecting, by the at least one processor, correlated noise into said at least one initial image projection of said initial scan of said patient; reconstructing, by at least one processor, said at least one initial image projection according to an algorithm specific to a task of said patient and based of said detected signal and said injecting of said correlated noise; displaying, by at least one processor, at least one low-dose preview image based on said reconstruction of said at least one initial image projection according to an algorithm specific to a task of said patient and based on said detected signal and said injecting of said correlated noise; and enabling, by at least one processor, a selection of said at least one low-dose preview image based on said at least one initial image projection according to an algorithm specific to a task of said patient and based on said detected signal and said injecting of said correlated noise for at least one subsequent scan.