1. A calcium scoring method comprising the steps of: detecting the delineation of a body surface in a tomographic image produced by an X-ray CT system; removing images of bones from a field encircled with the delineation of the body surface; detecting delineations of blood vessels from the tomographic image having the bone images removed therefrom; scoring calcium using the tomographic image having the bone images removed therefrom; and displaying only the intravascular calcium scores obtained using the fields inside the delineations of the blood vessels.