A method for obtaining diagnostic information about a region of a living being,
the region having a medical device with a radiopaque portion disposed therein.
An X-ray beam having a first energy level in excess of the K-absorption edge of
the radiopaque portion of the medical device is directed at the region to obtain
a first image information and radiographically locate the medical device within
the living being and an X-ray beam having second energy level at or below the K-absorption
edge is applied to the region to obtain a second image information.
