COHERENT SCATTERING AND BONE-MINERAL MEASUREMENT - THE DEPENDENCE OF SENSITIVITY ON ANGLE AND ENERGY

The sensitivity of a technique for the measurement of trabecular bone mineral concentration has been examined theoretically and experimentally. The technique is based on coherent gamma ray scattering and corrections for attenuation are obtained from transmitted photons rather than Compton scattered photons. For an incident photon energy of 60 keV, the minimum detectable bone mineral difference is practically independent of scattering angle while for an incident energy of 100 or 122 keV the scattering angle must be less than 70-degrees to optimize the minimum detectable difference.