1. A method for automatically registering an anatomical image with a physiological image, said method comprising: acquiring an anatomical image of a heart using a first imaging modality; acquiring a physiological image of the heart using a different second imaging modality; identifying a myocardium of a left ventricle using the physiological image; automatically scoring a plurality of pixels in the anatomical image that are within a predetermined range of the myocardium identified in the physiological image; and registering the anatomical image with the physiological image based on the score.