US Patent 7106894 Method for reducing X-ray noise

For each acquired current image, the displacement of said current image is determined relative to the acquired preceding image in the image acquisition plane, a displaced preceding filtered image is elaborated by spatially displacing the preceding filtered image, taking said displacement into account, and the current filtered image is elaborated by the weighted average between the acquired current image and the displaced preceding filtered image, so as to improve the quality of the images visualized.