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Improved MR imaging for patients with metallic implants.

A M Viano1, S A Gronemeyer, M Haliloglu

  • 1Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN 38105-2794, USA.

Magnetic Resonance Imaging
|April 4, 2000
PubMed
Summary

Two MRI techniques reduce metal artifacts in pediatric cancer patients with large prostheses. The high readout bandwidth method is preferred for its effectiveness and lack of image distortion.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Oncology

Background:

  • Metallic prostheses in pediatric oncology patients cause significant magnetic resonance (MR) imaging artifacts.
  • These artifacts hinder the evaluation of disease near implants, impacting treatment monitoring and patient care.

Purpose of the Study:

  • To compare two MR imaging techniques for reducing metal artifacts in pediatric oncology patients.
  • To determine the most effective technique for improving image quality and diagnostic accuracy in the presence of metallic implants.

Main Methods:

  • Two techniques were evaluated: a "tilted view-angle" method and a higher readout bandwidth technique.
  • The higher readout bandwidth technique involved increased bandwidth and shortened echo time (TE) in T(1)-weighted (T(1)W) turbo spin echo and turbo short tau inversion recovery (STIR) sequences.

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  • Subtraction of pre- and post-contrast images was used for effective fat suppression.

    • Main Results:

    • Both techniques successfully reduced metal-induced image artifacts.
    • The tilted view-angle method reduced artifacts more significantly but caused image blurring and shifting.
    • The high readout bandwidth, short echo technique reduced artifacts without blurring and required no special preparation.

    Conclusions:

    • The high readout bandwidth, short echo technique effectively reduces metal artifacts in pediatric oncology patients.
    • This method improves the ability to evaluate disease near metallic implants without compromising image quality.
    • Combining high-bandwidth, short echo sequences with contrast subtraction offers superior diagnostic capability.