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Gradient-Induced Mechanical Vibration of Neural Interfaces During MRI
IEEE Transactions on Bio-Medical Engineering
|June 22, 2019
Summary
Implanted devices can vibrate during MRI, causing harm. Optimizing MRI timing parameters, not just gradient slew rates, is crucial for preventing harmful resonant vibrations and ensuring patient safety.
Area of Science:
- Biomedical Engineering
- Medical Imaging Physics
- Materials Science
Background:
- Implanted medical devices can experience resonant vibrations during Magnetic Resonance Imaging (MRI).
- These vibrations pose risks including soft tissue irritation and implant degradation.
- Understanding implant mechanical behavior in physiological environments is critical for patient safety.
Purpose of the Study:
- To investigate the mechanical behavior of implant structures under MRI conditions.
- To analyze the influence of surrounding media (air, water, viscoelastic materials) on implant vibrations.
- To determine the relationship between MRI sequence parameters and vibration amplitude.
Main Methods:
- Analysis of static and dynamic transfer functions of test samples in various media.
- Utilized a laser-based acquisition method for high-resolution (10 μDeg) and high-dynamic-range (0-6 kHz) measurements.
- Conducted MRI experiments to correlate vibration strength with MR sequence parameters (e.g., TR, gradient slew rate).
Main Results:
- Vibrational forces ranged from micronewtons to millinewtons, comparable to implantation forces.
- Viscoelastic tissue provided less damping than anticipated, resulting in underdamped systems.
- Identical gradient slew rates yielded significantly different vibration amplitudes due to variations in timing parameters (TR), indicating resonant amplification.
Conclusions:
- Safe MRI procedures for patients with implants depend critically on selecting appropriate timing parameters, not solely gradient slew rates.
- Design improvements for implant longevity and patient safety during MRI can be achieved by considering mechanical characteristics.
- Avoiding resonant excitation requires careful matching of implant mechanical properties with MR sequence parameters.
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