A Simple Analytical Expression for the Gradient Induced Potential on Active Implants During MRI
| Autor: | Ergin Atalar, Şevin Güney, K. E. Bugdayci, Yusuf Ziya Ider, Vakur B. Erturk, Emre Kopanoglu, Esra Abaci Turk |
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| Přispěvatelé: | Atalar, Ergin |
| Rok vydání: | 2012 |
| Předmět: |
Electrode
Signal Processing computer-assisted Animal tissue Prostheses and implants Electric field Models biological Stimulation Risk Closed form medicine.diagnostic_test Active implants Phantoms Imaging Signal Processing Computer-Assisted Prostheses and Implants Mechanics Simplified expressions Magnetic Resonance Imaging Time-varying magnetic fields Magnetic field Nuclear magnetic resonance imaging Volume of interest Cylindrical phantoms Implantable medical devices Magnetic Resonance Imaging (mri) Stimulus response Anura Electric fields Materials science Biomedical Engineering Phantoms imaging Models Biological Article Validity Analytical expressions Magnetic resonance imaging Electromagnetic Fields Active Implantable Medical Devices (aimd) Gradient Fields Position (vector) medicine Animals lead Leg Implant Electromagnetic fields Extremities Nonhuman Expression (mathematics) Electromagnetic induction Biomedical equipment Gradient coil Magnetic fields Electric potential Gradient fields Active implantable medical devices (AIMD) Biomedical engineering |
| Zdroj: | IEEE Transactions on Biomedical Engineering |
| ISSN: | 1558-2531 0018-9294 |
| DOI: | 10.1109/tbme.2012.2212190 |
| Popis: | Cataloged from PDF version of article. During magnetic resonance imaging, there is an interaction between the time-varying magnetic fields and the active implantable medical devices (AIMD). In this study, in order to express the nature of this interaction, simplified analytical expressions for the electric fields induced by time-varying magnetic fields are derived inside a homogeneous cylindrical volume. With these analytical expressions, the gradient induced potential on the electrodes of the AIMD can be approximately calculated if the position of the lead inside the body is known. By utilizing the fact that gradient coils produce linear magnetic field in a volume of interest, the simplified closed form electric field expressions are defined. Using these simplified expressions, the induced potential on an implant electrode has been computed approximately for various lead positions on a cylindrical phantom and verified by comparing with the measured potentials for these sample conditions. In addition, the validity of the method was tested with isolated frog leg stimulation experiments. As a result, these simplified expressions may help in assessing the gradient-induced stimulation risk to the patients with implants. |
| Databáze: | OpenAIRE |
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