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Magnetic field effects on surgical ligation clips
M A Brown1, J A Carden, R E Coleman
1Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710.
Magnetic Resonance Imaging
|January 1, 1987
Summary
Surgical clips made of 17-7PH stainless steel pose significant MRI risks due to strong magnetic forces and image distortion. Titanium and tantalum clips demonstrate minimal magnetic interaction, making them safer for patients undergoing magnetic resonance imaging.
Area of Science:
- Biomedical Engineering
- Materials Science
- Radiology
Background:
- Surgical clips are commonly used in procedures.
- Magnetic Resonance Imaging (MRI) is a vital diagnostic tool.
- Understanding the magnetic properties of surgical implants is crucial for patient safety during MRI.
Purpose of the Study:
- To investigate magnetic forces and MRI distortion caused by surgical clips.
- To evaluate clips made from various materials (stainless steel, titanium, tantalum, niobium).
- To assess interactions at a 1.5 Tesla magnetic field strength.
Main Methods:
- Measurements of paramagnetism and eddy currents using a moving Gouy balance.
- Direct measurement of magnetic forces within a 1.5T MRI system.
- Evaluation of image distortion in phantoms and rabbits.
Main Results:
- Titanium and tantalum clips exhibited the least magnetic interaction and image distortion.
- Larger clips, regardless of material, showed greater interactions.
- 17-7PH stainless steel clips displayed the strongest ferromagnetic interactions, causing significant field distortions and attractive forces.
Conclusions:
- Surgical clips made from 17-7PH stainless steel present a substantial risk to patients during MRI scans.
- Titanium and tantalum are safer alternatives due to their minimal magnetic properties.
- Material selection for surgical clips is critical for MRI compatibility.