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Archives of Osteoporosis

, 14:18 | Cite as

Automated quantitative morphometry of vertebral heights on spinal radiographs: comparison of a clinical workflow tool with standard 6-point morphometry

  • Klaus EngelkeEmail author
  • B. Stampa
  • P. Steiger
  • T. Fuerst
  • H. K. Genant
Original Article

Abstract

Summary

A workflow tool for measurements of vertebral heights on lateral spine radiographs based on automated placements of 6 points per vertebra was evaluated. The tool helps to standardize point placement among operators. Its success rate is very good in normal vertebrae but lower in vertebrae with more severe fractures. Manual corrections were required in 192 of 1257 analyzed vertebrae.

Introduction

To evaluate a new workflow tool (SA) for the automated measurements of vertebral heights on lateral spine radiographs.

Methodology

Lateral radiographs from 200 postmenopausal women were evaluated at two visits. Genant’s semi-quantitative fracture assessment (SQ) and manual quantitative morphometry (QM) results were available from prior analyses. Vertebral heights from point placements using SA were compared with manual 6-point placement QM. Differences were quantified as RMS coefficient of variations (rmsCV) and standard deviations (rmsSD).

Results and conclusions

SA required manual corrections in 192 of 1257 vertebrae. SA heights were larger than QM ones by 2.2–3.6%. Correlations (r2 > 0.92) between SA and QM were very high. Differences between QM and SA were higher for fractured (SQ = 2; rmsCV% 14.5%) than for unfractured vertebrae (rmsCV% 4.2–4.7%). rmsCV% for QM varied between 3 and 6% and for SA between 2.5 and 7.5%. For SA, highest rmsCV% was obtained for T4 and L4. Manual correction mostly affected the end vertebrae T4 and L4. SA helps to standardize point placement among operators. The algorithm success rate is very good in normal vertebrae but lower in vertebrae with more severe fractures, which are of greater clinical interest but are more readily recognized without morphometric measurements.

Keywords

Active shape and appearance models Automated quantitative morphometry Vertebral fracture 

Notes

Acknowledgements

Preliminary results have been presented at the ASBMR 2010 and 2011 and at the ESCEO-IOF 2010 and 2011.

Compliance with ethical standards

Conflicts of interest

None.

Supplementary material

11657_2019_577_MOESM1_ESM.docx (2.1 mb)
ESM 1 (DOCX 2191 kb)

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2019

Authors and Affiliations

  • Klaus Engelke
    • 1
    • 2
    • 3
    Email author
  • B. Stampa
    • 2
  • P. Steiger
    • 4
  • T. Fuerst
    • 3
  • H. K. Genant
    • 5
  1. 1.Institute of Medical PhysicsUniversity of ErlangenErlangenGermany
  2. 2.Bioclinica Inc.HamburgGermany
  3. 3.Department of MedicineUniversity Hospital, University of Erlangen-NürnbergErlangenGermany
  4. 4.PAREXEL InternationalWalthamUSA
  5. 5.Department of RadiologyUniversity of CaliforniaSan FranciscoUSA

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