| Bone density from photon scan. The Cameron technique (Cameron and Sorenson, 1963, 1968) of bone-mineral analysis is used to determine the mineralization of the radius and the ulna in both arms. This technique passes a collimated beam of monoenergetic photons through the combination of soft tissue and bone in a limb, and the resulting attenuation is monitored with a suitable photon detector. The source and detector are moved across the limb; the resulting absorption curve can be related directly to the scan. The Norland-Cameron Analyzer, an automated instrument used since 1972 for the determination in vivo of bone-mineral content, provides direct digital readouts of both bone-mineral density and bone width without external calculation or manipulation of data. |
