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Single photon absorptiometry imaging as a screening method for diminished dual photon density measures.

W B Cutler1, J Karp, R Stine

  • 1Athena Institute for Women's Wellness Research, Haverford, PA 19041.

Maturitas
|July 1, 1988
PubMed
Summary

This study developed new screening parameters using single photon absorptiometry (SPA) to identify women needing dual photon absorptiometry (DPA) for bone density assessment, differentiating based on pelvic surgery status.

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Area of Science:

  • Bone Densitometry
  • Radiology
  • Gerontology

Background:

  • Assessing bone mineral density is crucial for osteoporosis prevention.
  • Dual photon absorptiometry (DPA) is accurate but costly.
  • Single photon absorptiometry (SPA) is more accessible but requires refined parameters for effective screening.

Purpose of the Study:

  • To develop and validate screening parameters using SPA to identify women who would benefit from DPA.
  • To establish thresholds for SPA measurements at the distal radius and mid-radius to predict low DPA spinal bone density.
  • To account for pelvic surgery status in refining SPA screening criteria.

Main Methods:

  • Single photon absorptiometry (SPA) was used to measure bone density at the distal and mid-radius in healthy women (36-66 years).

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  • Dual photon absorptiometry (DPA) measured bone density in the L2-L4 spinal region.
  • Data analysis involved stratifying women into 'intact' and 'post pelvic surgery' groups and using the lowest SPA score (% young normal [YN]) for analysis.

    • Main Results:

    • For intact women, a threshold of 80% YN at the radius indicated potential low spinal density.
    • For women post-pelvic surgery, a higher threshold of 93% YN was required.
    • These thresholds ensured that no women with diminished spinal density (less than 83% YN) were missed by the screening.

    Conclusions:

    • SPA can be effectively utilized as a screening tool for low bone density when specific thresholds are applied.
    • Accounting for pelvic surgery status refines SPA screening accuracy, optimizing the selection of women for DPA.
    • This approach can reduce unnecessary DPA scans, saving costs and improving screening efficiency.