A system, method, and apparatus includes a computed tomography (CT) system having a rotatable gantry, an x-ray source, a generator, a detector having pixels and positioned to receive x-rays, and a computer. The computer is programmed to acquire (102) CT data representative of an object, determine (112) a first subset of the CT data, determine (114) a second subset of the CT data, and determine (124) a difference between the first and second subsets of the CT data to identify a motion region in the object. The computer is also programmed to update (126) image data reconstructed from a first portion of the first subset of the CT data and corresponding to the region and reconstruct (128) an image based on the updated image data and non-updated image data. The non-updated image data is reconstructed from a second portion the first subset of the CT data.
