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Related Experiment Videos

Aneurysm clip testing for ferromagnetic properties: clip variability issues

E Kanal1, F G Shellock, J S Lewin

  • 1Department of Radiology, University of Pittsburgh Medical Center, PA 15213-2582, USA.

Radiology
|August 1, 1996
PubMed
Summary
This summary is machine-generated.

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Ferromagnetic intracranial aneurysm clips, even those labeled nonferromagnetic, can reorient in MRI scanners. This study highlights the critical need for standardized ferromagnetic testing of all implantable medical devices.

Area of Science:

  • Neurosurgery
  • Biomaterials Science
  • Medical Imaging Physics

Background:

  • Intracranial aneurysm clips are crucial for treating brain aneurysms.
  • Ensuring the safety of metallic implants in magnetic resonance imaging (MRI) environments is paramount.
  • Some aneurysm clips are marketed as nonferromagnetic, but their behavior in strong magnetic fields requires verification.

Purpose of the Study:

  • To evaluate the ferromagnetic properties of specific intracranial aneurysm clips.
  • To determine if clips reported as nonferromagnetic exhibit magnetic interactions in a 1.5-Tesla MRI scanner.

Main Methods:

  • Tested 1,765 Yasargil, 11 Sugita, and 15 Perneczky aneurysm clips.
  • Assessed clip behavior (rotation or translation) on plate glass within a 1.5-Tesla MRI imager.

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Main Results:

  • Sixty-three clips showed weak reorientation along the static MR field.
  • This included 52 Yasargil clips and 11 Perneczky clips.
  • No significant ferromagnetic interaction was observed for Sugita clips.

Conclusions:

  • The study confirms that some aneurysm clips, even those designated as nonferromagnetic, possess ferromagnetic properties.
  • These findings underscore the necessity for standardized testing protocols for ferromagnetic properties of all implantable metallic devices.
  • Standardized testing is essential to ensure patient safety in MRI environments.