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Related Experiment Videos

Improved lumen visualization in metallic vascular implants by reducing RF artifacts.

Lambertus W Bartels1, Chris J G Bakker, Max A Viergever

  • 1Image Sciences Institute, Department of Radiology, University Medical Center Utrecht, The Netherlands. W.Bartels@azu.nl

Magnetic Resonance in Medicine
|January 5, 2002
PubMed
Summary

This study introduces a new method to reduce MRI artifacts from metallic implants like stents. The technique enhances visualization of implant interiors, improving diagnostic imaging for vascular devices.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Metallic vascular implants (stents, filters) cause MRI artifacts.
  • Artifacts stem from flow, susceptibility, and radiofrequency (RF) eddy currents.
  • RF artifacts, specifically 'RF caging,' are poorly understood.

Purpose of the Study:

  • To explain the factors causing RF artifacts in metallic implants during MRI.
  • To propose and validate a method for reducing these artifacts.
  • To improve MRI visualization of the lumen within metallic vascular implants.

Main Methods:

  • Developed a theoretical explanation for RF caging in metallic implants.
  • Introduced a scaled excitation angle model to predict signal intensity.

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  • Validated the model with phantom experiments and tested the method in vitro and in vivo (pig model).

    • Main Results:

    • RF caging is caused by disturbances in RF coil sensitivities due to implant-coil coupling.
    • Increasing RF power in excitation pulses restored signal intensity without exceeding SAR limits.
    • Successful in vivo imaging of nitinol stent and vena cava filter interiors was achieved.

    Conclusions:

    • The proposed method effectively reduces MRI artifacts from metallic vascular implants.
    • Understanding RF caging mechanisms allows for improved imaging protocols.
    • This technique enhances the diagnostic utility of MRI for patients with vascular implants.