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; recording a first ECG signal for the single cardiac cycle concurrently with obtaining the first set of X-ray images; obtaining a second set of X-ray images of the blood vessel/myocardium over a number of cardiac cycles; recording a second ECG signal for the number of cardiac cycles concurrently with obtaining the second set of X-ray images; obtaining a set of intravascular images of the blood vessel/myocardium concurrently with obtaining the second set of X-ray images; synchronizing the set of intravascular images and the second set of X-ray images with regard to the time each of the set of intravascular images and each of the second set of X-ray images was obtained; selecting one of the set of intravascular images for review after obtaining the set of intravascular images; reviewing the second set of X-ray images to determine the one of the second set of X-ray images obtained at the same time as the selected one of the set of intravascular images; reviewing the first ECG signal to determine a first point in the single cardiac cycle at which one of the first set of X-ray images was obtained; reviewing the second ECG signal to determine a second point within the number of cardiac cycles that the one of the second set of X-ray images obtained at the same time as the selected one of the set of intravascular images was obtained, wherein the second point closely corresponds to the first point in their respective positions within the respective cardiac cycles; and overlaying the one of the first set of X-ray images taken at the first point with the one of the second set of X-ray images taken at the second point to form the combined X-ray image.