1. A method for processing image data, comprising the steps of: acquiring a set of image data representative of a region of interest using at least one imaging device; acquiring a set of motion data for two or more types of organs from at least one of one or more types of electrical sensors or one or more types of non-electrical sensors, wherein the electrical and non-electrical sensors are separate from the at least one imaging device, wherein the set of image data is acquired substantially concurrent with the set of motion data, and wherein the two or more types of organs each perform different physiological functions; processing the set of motion data to extract two or more retrospective gating points and one or more motion compensation factors; processing a portion of the set of image data based upon the two or more retrospective gating points and the one or more motion compensation factors; and displaying or storing an image generated from the portion of the set of image data.