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Related Experiment Videos

[CT osteodensitometry in the area immediate to hip endoprostheses]

R Sokiranski1, D Marienfeld, D Felsenberg

  • 1Radiologische Klinik und Poliklinik, Universität Ulm.

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|November 1, 1996
PubMed
Summary

Metal artifact reduction (MAR) significantly improves the accuracy of bone density measurements near metallic implants. This technique allows for reliable and reproducible quantitative bone density determination in patients with hip endoprostheses.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Orthopedics

Background:

  • Metallic implants in patients undergoing CT scans can cause artifacts, complicating accurate bone density assessment.
  • Quantitative bone density determination is crucial for monitoring bone health, especially around implants.

Purpose of the Study:

  • To evaluate the effectiveness of metal artifact reduction (MAR) software in improving quantitative bone density measurements near metallic implants.
  • To assess the reliability and reproducibility of bone density measurements after applying MAR.

Main Methods:

  • Ten cadaver femora with hip endoprostheses were scanned using CT with varied parameters.
  • Images were processed with a metal artifact reduction (MAR) program.
  • Bone density was compared before and after MAR, and against scans without implants.

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Main Results:

  • MAR improved correlation coefficients for bone density measurements near implants (r=0.987-0.992).
  • Reproducibility of density measurements with MAR showed low variation coefficients (0.75% for implants vs. 1.16% without).
  • Reproducibility of manual region of interest definition was 2.19%.

Conclusions:

  • Metal artifact reduction (MAR) software enables reliable and reproducible quantitative bone density determination in the presence of metallic implants.
  • MAR is a valuable tool for accurate assessment of bone density in orthopedic implant patients.