A system and method of correlating or coregistering medical images is disclosed herein that includes acquiring a surface image of the patient's skin surface using a surface detector assembly comprising a surface frame and a camera system registered to the surface frame. Positional coordinates of one or more surface landmarks in the surface image are determined and a medical image of the patient is acquired having the surface frame depicted therein. A second surface image of the patient's skin surface is acquired that at least partially overlaps the previously acquired surface image. Positional coordinates of one or more surface landmarks in the second surface image are determined and compared with surface landmarks in the previous surface image. Common surface landmarks are determined based on the comparison and the medical images are coregistered based on positional coordinates of the common surface landmarks.