1. An X-ray imaging system providing enhanced image feature visualization, comprising: at least one repository of data representing a sequence of X-ray images of a portion of patient anatomy acquired over a time interval and signal data representing electrical activity of the heart of the patient over the time interval; and an image data processor for, determining for individual images of said sequence of X-ray images, characteristics of a portion of said signal data associated with a corresponding image, said characteristics comprising at least one of, (a) a peak to peak value of a portion of said signal data associated with a corresponding image and (b) an average value of a portion of said signal data associated with said corresponding image, selecting a set of images exclusive of particular images from said sequence of X-ray images in response to the determined characteristics and generating an averaged image from said set of images.