Skeletal Radiology

, Volume 44, Issue 6, pp 849–856 | Cite as

Metal-induced artifacts in computed tomography and magnetic resonance imaging: comparison of a biodegradable magnesium alloy versus titanium and stainless steel controls

  • Lukas Filli
  • Roger Luechinger
  • Thomas Frauenfelder
  • Stefan Beck
  • Roman Guggenberger
  • Nadja Farshad-Amacker
  • Gustav Andreisek
Technical Report

Abstract

Objective

To evaluate metal artifacts induced by biodegradable magnesium—a new class of degradable biomaterial that is beginning to enter the orthopedic routine—on CT and MRI compared to standard titanium and steel controls.

Methods

Different pins made of titanium, stainless steel, and biodegradable magnesium alloys were scanned using a second-generation dual-energy multidetector CT and a 1.5-T MR scanner. In CT, quantitative assessment of artifacts was performed by two independent readers by measuring the noise in standardized regions of interest close to the pins. In MRI, the artifact diameter was measured. Interobserver agreement was evaluated using intraclass correlation coefficients. Artifacts were compared using Mann Whitney U tests.

Results

In comparison to stainless steel, biodegradable magnesium alloys induced significantly fewer artifacts in both 1.5-T MRI (p = 0.019–0.021) and CT (p = 0.003–0.006). Compared to titanium, magnesium induced significantly less artifact-related noise in CT (p = 0.003–0.008). Although artifacts were less on MRI for biodegradable magnesium compared to titanium, this result was not statistically significant.

Conclusion

Biodegradable magnesium alloys induce substantially fewer artifacts in CT compared to standard titanium and stainless steel, and fewer artifacts in MRI for the comparison with stainless steel.

Keywords

Biodegradable implants Magnesium Artifacts Magnetic resonance imaging Multidetector computed tomography 

Abbreviations

CT

Computed tomography

FFE

Fast-field echo

HU

Hounsfield units

kV

Kilovolts

ICC

Intraclass correlation coefficient

mAs

Milliampere-seconds

MRI

Magnetic resonance imaging

ROI

Region of interest

SE

Spin-echo

SEMAC

Slice encoding for metal artifact correction

VAT

View angle tilting

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Copyright information

© ISS 2014

Authors and Affiliations

  • Lukas Filli
    • 1
    • 4
  • Roger Luechinger
    • 2
  • Thomas Frauenfelder
    • 1
  • Stefan Beck
    • 3
  • Roman Guggenberger
    • 1
  • Nadja Farshad-Amacker
    • 1
  • Gustav Andreisek
    • 1
  1. 1.Department of Diagnostic and Interventional RadiologyUniversity Hospital ZurichZurichSwitzerland
  2. 2.Institute for Biomedical EngineeringUniversity and ETH ZurichZurichSwitzerland
  3. 3.Synthes GmbHZuchwilSwitzerland
  4. 4.Department of RadiologyUniversity Hospital ZurichZurichSwitzerland

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