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Trabecular bone morphology from micro-magnetic resonance imaging

J A Hipp1, A Jansujwicz, C A Simmons

  • 1Department of Orthopedic Surgery, Harvard Medical School, Boston, Massachusetts, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|February 1, 1996
PubMed
Summary
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Micro-magnetic resonance imaging (micro-MRI) accurately quantifies three-dimensional trabecular bone structure, matching conventional optical microscopy. This widely available technique offers a reliable method for assessing bone morphology.

Area of Science:

  • Biomedical Imaging
  • Bone Histomorphometry
  • Materials Science

Background:

  • Micro-magnetic resonance imaging (micro-MRI) shows potential for imaging trabecular bone structure.
  • Validation against traditional light microscopy is needed to confirm micro-MRI's quantitative accuracy.

Purpose of the Study:

  • To compare quantitative 3D bone morphology measurements obtained via micro-MRI and optical microscopy.
  • To assess the reliability and potential widespread applicability of micro-MRI for trabecular bone analysis.

Main Methods:

  • Bovine trabecular bone specimens were imaged using both light microscopy and micro-MRI (8.6 T magnet).
  • Three-dimensional bone morphology parameters, including volume fraction and trabecular number, were calculated using the method of directed secants.

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  • Quantitative data from both imaging modalities were statistically compared using paired t-tests.

    • Main Results:

    • Micro-MRI volume fraction (BV/TV) measurements showed a strong linear correlation (r2 = 0.81) with optical measurements and no significant statistical difference (p = 0.96).
    • Micro-MRI trabecular plate number (Tb.N) measurements were also linearly related (r2 = 0.53) and statistically comparable (p = 0.17) to optical results.
    • Trabecular orientation predicted by micro-MRI was within 6 degrees of optical calculations for 10 out of 16 specimens.

    Conclusions:

    • Micro-MRI provides quantitative measurements of trabecular bone morphology that are comparable to optical microscopy.
    • The ease of use and availability of micro-MRI systems suggest its broad utility for bone research and clinical applications.
    • Micro-MRI is a viable, accessible tool for accurate 3D trabecular bone quantification.