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Advances in MRI around metal.

Pia M Jungmann1,2,3, Christoph A Agten1,2, Christian W Pfirrmann1,3

  • 1Department of Radiology, Balgrist University Hospital, Zurich, Switzerland.

Journal of Magnetic Resonance Imaging : JMRI
|March 26, 2017
PubMed
Summary

Metal artifact reduction sequences (MARS) are crucial for MRI scans of patients with orthopedic implants. These advanced techniques minimize imaging artifacts, improving diagnostic accuracy for postoperative findings around metal implants.

Keywords:
artifactsjoint replacementmagnetic resonance imagingmetal implantsorthopedicspostoperative complications

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Area of Science:

  • Radiology and Medical Imaging
  • Biomedical Engineering
  • Orthopedic Surgery

Background:

  • The increasing prevalence of orthopedic metal implants, especially joint replacements, necessitates advanced imaging techniques.
  • Metal implants in MRI scans cause significant artifacts, hindering accurate radiological evaluation.
  • Effective metal artifact reduction is essential for diagnosing complications in patients with orthopedic implants.

Purpose of the Study:

  • To review current, clinically applicable metal artifact reduction sequences (MARS) for MRI.
  • To explain the principles, techniques, and limitations of MARS in musculoskeletal imaging.
  • To provide examples of orthopedic implants and postoperative MR findings around metal.

Main Methods:

  • Review of current literature on metal artifact reduction techniques in MRI.
  • Focus on clinically applicable MARS, including high bandwidth optimization, view angle tilting (VAT), multiacquisition variable-resonance image combination (MAVRIC), and slice-encoding for metal artifact correction (SEMAC).
  • Discussion of advanced techniques like parallel imaging, partial Fourier transformation, and compressed sensing.

Main Results:

  • MARS techniques significantly reduce metal-induced artifacts in MRI.
  • Techniques like MAVRIC and SEMAC, combined with advanced imaging and reconstruction methods, improve artifact reduction.
  • Artifact reduction may come at the cost of signal-to-noise ratio and/or acquisition time.

Conclusions:

  • Understanding MARS principles and limitations is key for clinical application.
  • MARS are vital for accurate radiological assessment of postoperative findings around orthopedic metal implants.
  • Continued development in musculoskeletal imaging addresses challenges of MRI around metal implants.