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Related Experiment Videos

Nonsusceptibility artifacts due to metallic objects in MR imaging

C R Camacho1, D B Plewes, R M Henkelman

  • 1Department of Medical Biophysics, University of Toronto, Ontario, Canada.

Journal of Magnetic Resonance Imaging : JMRI
|January 1, 1995
PubMed
Summary

Radio-frequency (RF) eddy currents from metallic objects cause significant magnetic resonance imaging artifacts. Researchers modeled this using a copper loop, finding RF fields induce artifacts, but magnetic field gradients do not, enabling artifact correction.

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Area of Science:

  • Medical Imaging
  • Electromagnetism
  • Materials Science

Background:

  • Metallic objects in Magnetic Resonance Imaging (MRI) scanners can cause significant image artifacts.
  • Understanding these artifacts is crucial for accurate medical diagnoses and patient safety.

Purpose of the Study:

  • To investigate the origin and characteristics of eddy current artifacts induced by metallic objects in MRI.
  • To analyze the contribution of radio-frequency (RF) fields versus magnetic field gradients to these artifacts.
  • To develop and apply methods for correcting RF-induced eddy current artifacts.

Main Methods:

  • A simplified model using a circular copper loop was employed to represent metallic implants.
  • Experiments were conducted to observe artifacts under RF and magnetic field gradient exposure.

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  • Quantitative analysis and theoretical calculations were performed to understand the artifact mechanism.
  • Correction methods for RF-induced eddy current artifacts were applied.

    • Main Results:

    • Radio-frequency (RF)-induced eddy currents in the copper loop model produced significant local artifacts.
    • No appreciable artifacts were observed due to switching magnetic field gradients.
    • Experimental results of RF coil sensitivity perturbations closely matched theoretical calculations.
    • Effective correction methods for the RF-induced eddy current artifact were successfully applied.

    Conclusions:

    • RF-induced eddy currents are the primary cause of artifacts from metallic objects in MRI, not magnetic field gradients.
    • The artifact mechanism involves perturbations in RF coil transmit and receive sensitivities.
    • A clear understanding of the mechanism facilitates the development of effective artifact correction strategies.