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Quantitative micro-computed tomography: a non-invasive method to assess equivalent bone mineral density.

Ara Nazarian1, Brian D Snyder2, David Zurakowski3

  • 1Orthopedic Biomechanics Laboratory, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, 02215, USA; Institute for Biomedical Engineering, University and ETH Zürich, 8044 Zürich, Switzerland.

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Summary

This study investigated microCT imaging parameters for bone mineral density assessment. Hydrogen dipotassium phosphate liquid phantoms offer a versatile and cost-effective method for accurate quantitative microCT analysis.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Micro computed tomography (microCT) is crucial for visualizing bone microstructure.
  • Accurate assessment of bone mineral density using microCT requires thorough investigation of imaging parameter effects.

Purpose of the Study:

  • To investigate the impact of various microCT imaging parameters on the relationship between linear attenuation coefficient and equivalent tissue density.
  • To evaluate the efficacy of in-house manufactured K2HPO4 liquid calibration phantoms and commercial Scanco phantoms for bone mineral density assessment.

Main Methods:

  • Utilized K2HPO4 liquid and Scanco solid calibration phantoms.
  • Varied imaging parameters including tube voltage, current, integration time, object-to-source distance, detector array size, and imaging media.
  • Employed multivariate linear regression to model equivalent tissue density.

Main Results:

  • Tube voltage, object-to-source distance, detector array size, and imaging media significantly affected the microCT density conversion relationship.
  • K2HPO4 liquid phantoms explained 90% of the variation in equivalent tissue density.
  • K2HPO4-derived densities for bovine cortical bone highly correlated with ash densities (R2=0.92).

Conclusions:

  • Scanco phantoms are suitable for bone mineral density assessment but have limitations regarding specimen inclusion and imaging media.
  • K2HPO4 liquid phantoms offer a flexible, cost-effective, and convenient alternative for quantitative microCT analysis across different systems and imaging media.
  • K2HPO4 liquid phantoms are susceptible to degradation over time.