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[Nuclear magnetic resonance and cochlear implant]
M Ouayoun1, K Dupuch, C Aitbenamou
1Laboratoire de Recherches ORL, Centre Hospitalo Universitaire Paris, Saint-Antoine.
Summary
Magnetic Resonance Imaging (MRI) on cochlear implant recipients is generally safe. Studies show no significant risks like implant displacement, adverse currents, or damage, though some image distortion may occur.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Neurosurgery
Background:
- Magnetic Resonance Imaging (MRI) poses potential risks for patients with implanted medical devices.
- Previous research identified several potential hazards, including magnetic force, induced currents, RF damage, image distortion, and tissue heating.
Purpose of the Study:
- To evaluate the safety and potential risks of MRI on the Digisonic cochlear implant.
- To assess risks including magnetic field force, induced currents, implant damage, and image distortion.
Main Methods:
- The Digisonic cochlear implant was subjected to MRI using a Siemens Magneton 42 SP (1 Tesla, 42 MHz RF).
- Tests included T1 and T2 sequences to observe implant behavior and effects.
Main Results:
- No implant displacement was observed when properly secured.
- No adverse currents were detected in electrodes or internal circuitry.
- No damage or adverse magnetization occurred in the studied receivers.
- MRI images showed moderate distortion around the implant, approximately three times its volume.
Conclusions:
- MRI is considered safe for patients with the Digisonic cochlear implant, with no significant contraindications.
- Proper surgical attachment of the implant is crucial for MRI safety.
- Potential image distortion is a manageable side effect.