1. A method for producing enhanced X-ray images of a blood vessel/myocardium, the method comprising the steps of: obtaining a first set of X-ray images of the blood vessel/myocardium over a single cardiac cycle; obtaining a second set of X-ray images of the blood vessel/myocardium over a number of cardiac cycles; synchronizing the second set of X-ray images and the first set of X-ray images with regard to the portion of the cardiac cycle at which each image was obtained; and overlaying one of the first set of X-ray images with a synchronized one of the second set of X-ray images to produce a combined X-ray image.