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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
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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.

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.