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MR procedures and biomedical implants, materials, and devices: 1993 update
F G Shellock1, S Morisoli, E Kanal
1Department of Radiological Sciences, UCLA School of Medicine.
Radiology
|November 1, 1993
Summary
Ferromagnetic metallic implants may move during magnetic resonance (MR) imaging due to static magnetic fields. This risk may contraindicate MR procedures for patients with these devices.
Area of Science:
- Medical Imaging
- Biomaterials Science
- Physics
Background:
- Ferromagnetic materials in medical implants pose potential risks during Magnetic Resonance (MR) procedures.
- Understanding the behavior of metallic implants in static magnetic fields is crucial for patient safety.
Purpose of the Study:
- To compile data on ferromagnetic metallic implants, materials, and devices.
- To assess their behavior when exposed to static magnetic fields during MR imaging or spectroscopy.
Main Methods:
- Reviewed over 80 studies on ferromagnetic objects.
- Documented object type, material, deflection, and maximum magnetic field strength (0.147–4.7 T).
Main Results:
- Evaluated the ferromagnetic properties of 338 diverse objects.
- Included aneurysm clips, vascular clamps, heart valve prostheses, orthopedic and otologic implants, stents, and more.
Conclusions:
- Movement or dislodgement of ferromagnetic implants is a risk during MR procedures.
- MR imaging or spectroscopy may be contraindicated for patients with these objects.