Cross-sectional structural parameters from densitometry

Journal of Biomechanics
Tammy M Cleek, Robert T Whalen

Abstract

Bone densitometry has previously been used to obtain cross-sectional properties of bone from a single X-ray projection across the bone width. Using three unique projections, we have extended the method to obtain the principal area moments of inertia and orientations of the principal axes at each scan cross-section along the length of the scan. Various aluminum phantoms were used to examine scanner characteristics to develop the highest accuracy possible for in vitro non-invasive analysis of cross-sectional properties. Factors considered included X-ray photon energy, initial scan orientation, the angle spanned by the three scans (included angle), and I(min)/I(max) ratios. Principal moments of inertia were accurate to within +/-3.1% and principal angles were within +/-1 degrees of the expected value for phantoms scanned with included angles of 60 degrees and 90 degrees at the higher X-ray photon energy (140 kVp). Low standard deviations in the error (0.68-1.84%) also indicate high precision of calculated measurements with these included angles. Accuracy and precision decreased slightly when the included angle was reduced to 30 degrees. The method was then successfully applied to a pair of excised cadaveric tibiae. The accuracy an...Continue Reading

References

Jul 1, 1975·Journal of Biomechanics·R J MinnsJ Campbell
Feb 1, 1991·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·E S Orwoll, S K Oviatt
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Citations

Jan 21, 2017·Annals of Biomedical Engineering·Alexander M BakerGary S Beaupre
Nov 2, 2005·Medicine and Science in Sports and Exercise·Tammy M Cleek, Robert T Whalen

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