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Related Experiment Videos

Eddy-current-induced artifacts caused by an "MR-compatible" halo device.

J A Malko1, J C Hoffman, P J Jarrett

  • 1Department of Radiology, Emory University School of Medicine, Atlanta, GA 30322.

Radiology
|November 1, 1989
PubMed
Summary

Magnetic resonance (MR) imaging devices using traction or halo supports may create image artifacts. These artifacts, caused by eddy currents, can be eliminated by disrupting the electrical continuity of the device

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Area of Science:

  • Medical imaging
  • Biomedical engineering

Background:

  • Traction and halo devices are utilized in medical settings for skeletal support.
  • These devices are often presumed compatible with magnetic resonance (MR) imaging due to nonferromagnetic materials.

Purpose of the Study:

  • To investigate the potential for MR image artifacts caused by traction or halo devices.
  • To identify the underlying mechanism of artifact generation.
  • To propose a method for artifact mitigation.

Main Methods:

  • Observation of MR image artifacts in patients with traction or halo devices.
  • Analysis of artifact causation related to device materials and MR imaging parameters.
  • Experimental manipulation of device electrical continuity.

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Main Results:

  • Nonferromagnetic traction or halo devices can induce significant MR image artifacts.
  • Eddy currents generated by the radio-frequency excitation field in the device's conducting frame are responsible.
  • Artifact severity is dependent on device orientation within the MR unit.

Conclusions:

  • Traction or halo devices, despite nonferromagnetic composition, are not inherently MR imaging compatible.
  • Disrupting the electrical continuity of the device's supporting frame effectively eliminates MR image artifacts.
  • Clinical protocols should consider potential artifacts from these devices.