Patent ID: 6816564
Filing Date: 2004-11-09
Classification: A61B,G01N,Y10S

Abstract:
A method for deriving bone properties from dual-energy x-ray absorptiometry images, the method comprising:receiving first image data comprising pixels indicating attenuation through a plurality of known thicknesses of a first two calibration materials at a first photon energy; receiving second image data comprising pixels indicating attenuation through the plurality of known thicknesses of the first two calibration materials at a second photon energy; determining first conic surface function relating attenuation data from first image data to the plurality of known thicknesses; determining second conic surface function relating attenuation data from second image data to the plurality of known thicknesses; inverting the first conic surface function and the second conic surface function to determine a pair of thickness functions, each thickness function relating thickness of one calibration material to attenuations from the first image data and the second image data; and applying the pair of thickness functions with attenuations from image data comprising pixels indicating attenuation through tissue of a subject.