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Related Experiment Videos

Metal artifact reduction sequence: early clinical applications.

R V Olsen1, P L Munk, M J Lee

  • 1Departments of Radiology, University of British Columbia, Vancouver General Hospital, 855 W 12th Ave, Vancouver, British Columbia, Canada.

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|June 2, 2000
PubMed
Summary

Metal artifact reduction sequence (MARS) significantly improves orthopedic MRI visualization of tissues near metallic implants. This technique aids in diagnosing conditions like avascular necrosis and assessing post-surgical outcomes.

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Area of Science:

  • Orthopedic Magnetic Resonance Imaging (MRI)
  • Medical Imaging Techniques
  • Biomedical Engineering

Background:

  • Metal hardware in orthopedic implants causes significant artifacts in MRI scans, hindering diagnostic accuracy.
  • Susceptibility artifacts, caused by magnetic field distortion, obscure critical anatomical details near implants.

Purpose of the Study:

  • To evaluate the effectiveness of the Metal Artifact Reduction Sequence (MARS) in improving MRI visualization of orthopedic implants.
  • To demonstrate the clinical utility of MARS across various orthopedic applications.

Main Methods:

  • MARS employs view angle tilting and increased gradient strength, compatible with spin-echo sequences without increasing imaging time.
  • The technique was applied to orthopedic cases involving hip, knee, and spine implants, as well as wrist fractures.

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Main Results:

  • MARS effectively reduces the size and intensity of metal artifacts, enabling clear visualization of adjacent bone and soft tissues.
  • Improved visualization was noted in patients with hip screws, knee arthroplasty, spinal fixation hardware, and wrist implants.

Conclusions:

  • MARS is a valuable tool for orthopedic MRI, significantly enhancing the diagnostic capability in the presence of metallic hardware.
  • The technique facilitates accurate diagnosis and assessment in diverse orthopedic scenarios, including avascular necrosis, post-surgical evaluation, and hardware-related complications.