Osteoporosis International

, Volume 17, Issue 4, pp 608–615

Detection of osteoporotic vertebral fractures using multidetector CT

  • J. S. Bauer
  • D. Müller
  • A. Ambekar
  • M. Dobritz
  • M. Matsuura
  • F. Eckstein
  • E. J. Rummeny
  • T. M. Link
Original Article

DOI: 10.1007/s00198-005-0023-8

Cite this article as:
Bauer, J.S., Müller, D., Ambekar, A. et al. Osteoporos Int (2006) 17: 608. doi:10.1007/s00198-005-0023-8

Abstract

Introduction

Goals were to compare the performance of lateral radiographs and sagittal reformations (SR) of axial computed tomography (CT) datasets in identification of osteoporotic vertebral fractures and to assess for optimal slice thickness in axial CT datasets needed for reliable classification of these fractures.

Methods

Sixty-five vertebrae were harvested from 21 human cadaver spines and examined with a 64-row multidetector CT scanner. Axial images were acquired with a slice thickness of 0.6, 1, 2, 3 and 5 mm and SR were obtained using these datasets. In addition, specimens were radiographed in antero-posterior and lateral orientation. Vertebrae visualized in the different image datasets were separately graded by four radiologists according to the spinal fracture index (SFI) classification. Fracture status determined in a consensus reading of interactive reformations of the 0.6-mm CT dataset in all three dimensions served as a standard of reference in combination with pathological examinations.

Results

The average agreement for the 0.6-mm SR obtained between each radiologist and standard of reference for the grading of the fractures was very good (κ=0.81). It was good for the 1-, 2- and 3-mm SR (κ=0.70, 0.69 and 0.64), but only moderate for the radiographs (κ=0.52), and fair for the 5-mm SR (κ=0.33). When focusing only on detection of fractures, independent of the grading, all κ values improved by about 0.15, resulting in excellent values for the 0.6-mm through 3-mm SR (0.95<κ<0.79) and good values for the radiographs (κ=0.72). Ninety-five percent of the fractures could be identified using the 1-mm SR, but 18% of the fractures were missed on the radiographs.

Conclusions

Sagittal CT reformations could more accurately assess vertebral fractures than standard radiographs. But for reliable detection of these fractures, SR derived from axial images with a slice thickness of 3 mm or less are required. The thinnest available axial slice thickness performed best in fracture grading.

Keywords

Vertebral fractures Osteoporosis Multidetector CT Radiographs 

Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2005

Authors and Affiliations

  • J. S. Bauer
    • 1
    • 2
    • 5
  • D. Müller
    • 2
  • A. Ambekar
    • 1
  • M. Dobritz
    • 2
  • M. Matsuura
    • 4
  • F. Eckstein
    • 3
  • E. J. Rummeny
    • 2
  • T. M. Link
    • 1
  1. 1.Department of RadiologyUniversity of California of San FranciscoSan FranciscoUSA
  2. 2.Institut für RöntgendiagnostikTechnische Universität MünchenMunichGermany
  3. 3.Institute of Anatomy and Musculoskeletal ResearchParacelsus Medical Private UniversitySalzburgAustria
  4. 4.Department of AnatomyLudwig-Maximilian-Universität MünchenMunichGermany
  5. 5.Musculoskeletal and Quantitative Imaging Research, Department of RadiologyUniversity of CaliforniaSan FranciscoUSA

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