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Relationship between computed tomographic image analysis and histomorphometry for microarchitectural characterization
B Cortet1, D Chappard, N Boutry
1Department of Rheumatology, University-Hospital of Lille, 59037 Lille CEDEX, France. bcortet@chru-lille.fr
Calcified Tissue International
|May 7, 2004
Summary
Computed tomographic (CT) image analysis of bone microarchitecture shows significant correlations with histomorphometry, especially for basic parameters like bone volume/tissue volume (BV/TV). However, the strength of correlation varies by parameter, with some requiring nonlinear models for accurate assessment.
Area of Science:
- Orthopedics
- Radiology
- Biomedical Engineering
Background:
- Accurate assessment of bone microarchitecture is crucial for understanding skeletal health and disease.
- Histomorphometry provides detailed structural information but is invasive.
- Computed tomographic (CT) imaging offers a less invasive method for bone analysis.
Purpose of the Study:
- To compare and characterize the relationships between bone microarchitecture variables measured by CT image analysis and histomorphometry.
- To evaluate the correlation strength of various microarchitectural parameters between the two methods.
- To determine the most appropriate models (linear or nonlinear) for describing these relationships.
Main Methods:
- Analysis of 24 calcaneus cadaveric specimens.
- CT image analysis of 15 sagittal sections (1 mm width, 2 mm spacing).
- Histomorphometric analysis of 6 undecalcified sections (7 microm) using a Leica Quantimet Q570 image analyzer.
Main Results:
- High correlations (R values 0.69-0.90, P < 0.01) were observed for bone volume/tissue volume (BV/TV), trabecular number (Tb.N), and trabecular separation (Tb.Sp).
- Moderate correlations were found for marrow space star volume (SV) and Euler number (EN).
- Nonlinear models (logarithmic, exponential) provided better fits for certain parameters like SV, number of nodes (N Nd), and number of terminus (N Tm).
Conclusions:
- CT image analysis provides reliable measures of trabecular bone structure, showing significant correlations with histomorphometry.
- The correlation strength depends on the specific microarchitectural parameter assessed.
- Basic parameters (Parfitt's parameters) exhibit the strongest correlations, while nonlinear models may be necessary for other variables.