Wireless control of induced radiofrequency currents in active implantable medical devices during MRI
| Autor: | Berk Silemek, Volkan Acikel, Ergin Atalar |
|---|---|
| Přispěvatelé: | Silemek, Berk, Atalar, Ergin |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Remote computer Radio Waves Active implantable medical devices Heating reduction 030218 nuclear medicine & medical imaging law.invention Bluetooth 03 medical and health sciences MR heating 0302 clinical medicine law Transmission line Electric Impedance Radiology Nuclear Medicine and imaging Lead (electronics) Electrodes Electrical impedance Wireless control RF safety Prostheses and Implants Magnetic Resonance Imaging Safety profile Electrode MoTLiM 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | Magnetic Resonance in Medicine |
| ISSN: | 1522-2594 0740-3194 |
| DOI: | 10.1002/mrm.28089 |
| Popis: | Purpose To introduce a prototype active implantable medical device (AIMD) for which the induced radiofrequency currents can be controlled wirelessly. Methods The modified transmission line method is used to formulate how the lead-case impedance of an AIMD affects the temperature rise around the electrode. A prototype AIMD is designed with the aim of controlling the unwanted temperature rise around its electrode during an MRI examination by altering the impedance between the lead and the case of the implant. MRI experiments were conducted with this prototype implant, which also has a built-in temperature sensor at its electrode. During the experiment, the implant's lead-case impedance was controlled using Bluetooth communication with a remote computer, and the lead tip temperature was recorded. Results Ten different lead-case impedance values and their corresponding tip temperature rises were examined during MRI experiments. The experimental results confirmed that the tip temperature rise can be controlled by varying the lead-case impedance wirelessly. Conclusion The feedback from the temperature at the AIMD tip, together with variable lead-case impedance, enables control of the safety profile of the AIMD during an MRI examination. |
| Databáze: | OpenAIRE |
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