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Bone densitometry of excised vertebrae; anatomical relationships
R B Mazess1, P Pedersen, J Vetter
1Department of Medical Physics, University of Wisconsin, Madison.
Calcified Tissue International
|June 1, 1991
Summary
Comparing bone mineral density (BMD) measurement methods in vertebrae, quantitative computed tomography (QCT) and dual-photon absorptiometry (DPA) showed strong correlations with overall bone density, highlighting the importance of projection and region selection.
Area of Science:
- Orthopedics
- Radiology
- Biomedical Engineering
Background:
- Accurate bone mineral density (BMD) assessment is crucial for diagnosing osteoporosis and guiding treatment.
- Vertebral BMD measurement is essential due to the high prevalence of vertebral fractures in osteoporotic patients.
- Various densitometric techniques exist, each with potential strengths and limitations for assessing spinal bone density.
Purpose of the Study:
- To compare the accuracy and correlation of three densitometric methods for measuring bone mineral density (BMD) in human vertebrae.
- To evaluate the influence of projection (anterior-posterior vs. lateral) and region of interest on BMD measurements.
- To determine which methods are most predictive of the integral vertebral body density.
Main Methods:
- Bone mineral density (BMD) was measured in 32 excised vertebrae using three techniques: dual-energy quantitative computed tomography (QCT), dual-photon absorptiometry (DPA) with 153-Gd, and scanning slit X-ray absorptiometry (SSXA).
- QCT and SSXA were performed in both anterior-posterior (AP) and lateral projections.
- Correlations between different methods and specific regions of interest were analyzed.
Main Results:
- The anterior QCT region-of-interest showed a lower density than the total trabecular portion but was highly correlated (r=0.96).
- Anterior QCT correlated moderately with DPA (r=0.77).
- Both anterior QCT and DPA were similarly predictive of integral vertebral body density (r=0.81 and r=0.86, respectively), outperforming lateral projection measurements.
Conclusions:
- The choice of projection and region examined significantly impacts bone mineral density (BMD) measurements in vertebrae.
- Dual-photon absorptiometry (DPA) and quantitative computed tomography (QCT) using anterior projections demonstrate good correlation with overall vertebral bone density.
- These findings emphasize the need to consider methodological differences when interpreting spinal BMD results from various densitometric techniques.