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Universal standardization of forearm bone densitometry.

John A Shepherd1, Xiao Guang Cheng, Ying Lu

  • 1Department of Radiology, University of California San Francisco, 94143-1349, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|March 29, 2002
PubMed
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Forearm bone density measurements vary significantly between different bone densitometers. Standardized bone mineral density units and phantom data are proposed to improve cross-device comparisons for patient data.

Area of Science:

  • Medical Imaging
  • Orthopedics
  • Biomedical Engineering

Background:

  • Device-dependent variations in forearm bone density measurements pose challenges for clinical data interpretation.
  • Accurate bone density assessment is crucial for diagnosing and managing osteoporosis.

Purpose of the Study:

  • To quantify device-dependent differences in forearm bone density measurements.
  • To develop standardized units for comparable bone density analysis across different densitometers.
  • To assess the utility of phantom data for in vitro cross-calibration.

Main Methods:

  • 101 women (20-80 years) were scanned on six different forearm bone densitometers.
  • Regression statistics were analyzed for similar regions of interest (ROIs), noting variations in ROI size and placement.

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  • Five phantoms were scanned and characterized on five devices to report precision and mean values.

    • Main Results:

    • Correlation coefficients (r) ranged from 0.7 to 0.97, with higher correlations between similar ROIs.
    • Standardized bone mineral density units (sdBMD, smBMD, spBMD) were derived for distal, mid-, and proximal regions.
    • Phantom data provided in vitro cross-calibration values to aid in recreating in vivo relationships.

    Conclusions:

    • Significant device-dependent differences exist in forearm bone density measurements.
    • Standardized units and phantom data can facilitate cross-calibration and improve comparability of bone density data.
    • Caution is advised when pooling clinical data from different devices due to potential increases in least significant differences.