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Dual x-ray absorptiometry forearm software: accuracy and intermachine relationship

S Hagiwara1, K Engelke, S O Yang

  • 1Department of Radiology, University of California, San Francisco.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|September 1, 1994
PubMed
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Dual X-ray absorptiometry (DXA) forearm measurements are accurate for assessing bone mineral content and density. Cross-calibration is essential for comparing data between different DXA manufacturers.

Area of Science:

  • Medical Imaging
  • Orthopedics
  • Bone Densitometry

Background:

  • Accurate assessment of bone mineral content (BMC) and bone mineral density (BMD) is crucial for diagnosing osteoporosis and monitoring treatment.
  • Dual X-ray absorptiometry (DXA) is a widely used technique for measuring BMC and BMD.
  • Variations in DXA system hardware and software can lead to differences in measurements between manufacturers.

Purpose of the Study:

  • To evaluate the accuracy of forearm measurements using three different DXA systems.
  • To assess the cross-calibration accuracy of bone mineral content and density between these DXA scanners.
  • To determine the reliability of DXA forearm software for bone density assessment.

Main Methods:

  • An ash study was conducted using 20 cadavers to analyze forearm measurements at the one-third site.

Related Experiment Videos

  • Three DXA systems were used: Hologic QDR-2000, Hologic QDR-1000/W, and Lunar DPX-L.
  • Ten healthy volunteers were scanned to perform forearm cross-calibration of bone mineral content and density.

    • Main Results:

    • Excellent correlations (r > 0.97) were observed between ash weight and DXA bone mineral content across all three instruments, with accuracy errors below 5.2%.
    • Excellent correlations (r > 0.95) were found among the DXA machines for forearm cross-calibration.
    • Significant differences in absolute bone mineral content and density values were noted between the Hologic and Lunar systems, although Hologic systems showed close-to-unity slopes and intercepts.

    Conclusions:

    • DXA forearm software packages offer accurate methods for assessing bone mineral content and density.
    • Direct conversion of bone mineral content and density data between different DXA manufacturers is not recommended.
    • Careful cross-calibration measurements are necessary for comparing data across different DXA systems and manufacturers.