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Evaluation of cortical bone by computed tomography

T N Hangartner1, V Gilsanz

  • 1BioMedical Imaging Laboratory, Wright State University, Dayton, Ohio, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|October 1, 1996
PubMed
Summary

Accurate measurement of cortical bone density using computed tomography (CT) requires a minimum cortical thickness of 2-2.5 mm. Below this threshold, CT density measurements become inaccurate, impacting bone health assessments.

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Area of Science:

  • Bone densitometry
  • Medical imaging
  • Orthopedics

Background:

  • Accurate assessment of cortical bone material density is crucial for diagnosing and monitoring bone diseases.
  • Computed tomography (CT) is a widely used imaging modality for bone analysis, but its accuracy depends on bone thickness.

Purpose of the Study:

  • To determine the minimum cortical bone thickness for accurate CT density measurements.
  • To establish normal reference values for cortical bone density and width in a healthy population.

Main Methods:

  • A phantom study was conducted using bone-like material with varying wall thicknesses.
  • CT scans were performed using a standard GE 9800 CT scanner and an OsteoQuant extremity CT scanner.
  • Cortical bone density and width were measured in 761 healthy subjects (ages 4-84) using CT.

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Main Results:

  • The minimum cortical thickness required for accurate CT density measurement was 2-2.5 mm for both scanners.
  • Below this threshold, CT density values decreased linearly with decreasing width.
  • In humans, cortical bone density was consistent above 2-2.5 mm thickness and unaffected by height or weight.
  • Cortical width increased with age until 30 years and decreased after 50 years.

Conclusions:

  • Computed tomography can accurately measure cortical bone material density in the appendicular skeleton when cortical thickness exceeds 2-2.5 mm.
  • Establishing age-related reference ranges for cortical width is important for interpreting bone density measurements.
  • These findings provide critical guidelines for optimizing CT-based bone densitometry protocols.