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Body composition analysis by DEXA by using dynamically changing samarium filtration

A Gotfredsen1, L Baeksgaard, J Hilsted

  • 1Department of Internal Medicine, Copenhagen University Hospital, Hvidovre, Denmark.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1997
PubMed
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Dual-energy X-ray absorptiometry (DEXA) offers accurate body composition analysis. A new dynamic filtration system on the Norland XR-36 enhances accuracy, validating DEXA as a reliable method.

Area of Science:

  • Biomedical Engineering
  • Medical Imaging

Background:

  • Dual-energy X-ray absorptiometry (DEXA) is a precise tool for body composition analysis.
  • Measurement accuracy can be compromised by beam hardening and other errors, particularly at measurement extremes.

Purpose of the Study:

  • To evaluate the accuracy of the Norland XR-36 DEXA system with a novel dynamic samarium filtration system.
  • To assess the system's effectiveness in compensating for beam hardening in body composition analysis.

Main Methods:

  • The Norland XR-36 system utilizes a dynamically changing samarium filtration system.
  • Accuracy was validated using plastic phantoms, tissue samples (ox muscle, lard), and human volunteers with varying tissue compositions.

Main Results:

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  • Excellent agreement (r = 0.99) was observed between reference and measured tissue/fat percentages in phantoms and tissue samples.
  • High correlation (r = 0.99) was found between reference and DEXA values for soft tissue mass and fat percentage in human volunteers.

    • Conclusions:

    • The DEXA method, specifically the Norland XR-36 with dynamic filtration, demonstrates high accuracy in body composition analysis.
    • This advanced DEXA system shows potential as a future reference method and a valuable supplement to traditional body composition techniques.