Related Experiment Videos
Aneurysm clips: magnetic quantification and magnetic resonance imaging safety. Technical note
M Dujovny1, M S Alp, N Dujovny
1Department of Neurosurgery, University of Illinois, Chicago 60612, USA. mdujovny@uic.edu
Journal of Neurosurgery
|November 5, 1997
Summary
Magnetic properties of cerebral aneurysm clips were measured. Clips with a magnetic moment under 1 electromagnetic unit per gram are safe for magnetic resonance imaging (MRI).
Area of Science:
- Biomedical Engineering
- Medical Physics
- Materials Science
Background:
- Magnetic Resonance Imaging (MRI) is a crucial diagnostic tool.
- Cerebral aneurysm clips are commonly used in neurosurgery.
- Understanding the magnetic properties of these clips is vital for patient safety during MRI.
Purpose of the Study:
- To quantify the magnetic properties of various cerebral aneurysm clips.
- To determine a safe threshold for using aneurysm clips during MRI.
- To establish a standardized method for measuring clip magnetic properties.
Main Methods:
- Utilized a vibrating sample magnetometer to measure magnetic properties in electromagnetic units (EMU/g).
- Tested 13 different types of cerebral aneurysm clips.
- Assessed clip movement during simulated MRI conditions.
Main Results:
- Magnetic moments ranged from 0.15 EMU/g to 152.7 EMU/g.
- A magnetic moment threshold of less than 1 EMU/g was identified for safe MRI use.
- The vibrating sample magnetometer method proved reliable and applicable across different field gradients.
Conclusions:
- Cerebral aneurysm clips with a magnetic moment below 1 EMU/g can be safely employed during MRI procedures.
- The vibrating sample magnetometer is a suitable standard for measuring and labeling the magnetic properties of aneurysm clips.
- This quantification method ensures accurate material characterization for neurosurgical implants.