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Related Experiment Video

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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Multi-site phantomless bone mineral density from clinical quantitative computed tomography in males.

Zachary A Haverfield1, Amanda M Agnew1, Kathryn Loftis2

  • 1Injury Biomechanics Research Center, The Ohio State University, Columbus, Ohio 43210, United States.

JBMR Plus
|September 3, 2024
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Summary

Phantomless methods for calculating volumetric bone mineral density (vBMD) using QCT are accurate and comparable to phantom-based methods. Regression-based phantomless (RPL) calibration shows promise for opportunistic QCT and assessing bone quality.

Keywords:
QCTbone qualityinternal reference calibrationphantomless calibrationregression-based calibrationvBMD

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Area of Science:

  • Radiology
  • Orthopedics
  • Biomedical Engineering

Background:

  • Quantitative CT (QCT) is standard for volumetric bone mineral density (vBMD) assessment.
  • Traditional QCT requires phantom rods, which are not always available.
  • Phantomless methods, including internal-reference phantomless (IPL) and Hounsfield unit (HU) measurements, offer alternatives.

Purpose of the Study:

  • To evaluate the accuracy of phantomless QCT methods (IPL and regression-based phantomless (RPL) using HU) compared to phantom-based (PB) methods.
  • To assess the performance of these methods across multiple skeletal sites.
  • To validate HU as a proxy for vBMD calculation.

Main Methods:

  • QCT scans from 100 male post-mortem human subjects (PMHS) were analyzed.
  • vBMD was calculated using site-specific PB calibration.
  • IPL and RPL vBMD were determined using a development sample (50/100 PMHS) for calibration and validated on the remaining subjects.

Main Results:

  • PB and phantomless vBMD (IPL/RPL) showed no significant differences (p > .05).
  • Univariate regressions between PB and phantomless vBMD were significant (p < .05), except for IPL Rad-30 (p = .078).
  • RPL vBMD demonstrated strong correlation with PB vBMD (R² = 99.17%) with smaller differences compared to IPL vBMD (R² = 97.99%).

Conclusions:

  • Phantomless QCT methods, particularly RPL, are accurate and comparable to PB methods for vBMD assessment.
  • Site-specific calibration is recommended for phantomless methods to enhance accuracy.
  • RPL calibration improves the utility of opportunistic QCT for bone quality and fracture risk assessment.