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Related Experiment Video

Updated: Jul 20, 2025

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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Wirelessly interfacing sensor-equipped implants and MR scanners for improved safety and imaging.

Berk Silemek1, Frank Seifert1, Johannes Petzold1

  • 1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany.

Magnetic Resonance in Medicine
|August 3, 2023
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Summary

This study introduces a new method using sensor-equipped implants to reduce radiofrequency (RF) heating during MRI scans. This innovation enhances patient safety by wirelessly transmitting data to suppress heating and maintain image quality.

Keywords:
Bluetooth low energyMR safetyRF heatingactive implantable medical devicesdeep brain stimulationneural implants

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Radiofrequency Engineering

Background:

  • Active implanted medical devices (AIMDs) pose safety risks during MRI due to radiofrequency (RF) heating.
  • Current methods for mitigating RF heating are often manual and burdensome for MRI personnel.
  • Novel approaches are needed to ensure patient safety and maintain image quality in the presence of AIMDs.

Purpose of the Study:

  • To investigate a novel reduced RF heating method for MRI in the presence of AIMDs.
  • To employ a sensor-equipped implant for wireless feedback during MRI scans.
  • To suppress implant tip heating and preserve image quality using real-time feedback.

Main Methods:

  • A sensor-equipped implant measured RF-induced fields and temperature at the implant tip.
  • Wireless transmission of sensor data to the MRI scanner enabled calculation of parallel transmission (pTx) excitation vectors.
  • Methodology validated in 7T testbed experiments and 3T phantom studies with realistic deep brain stimulation (DBS) lead configurations.

Main Results:

  • The implant accurately measured RF fields (R²=0.93) and temperature rises (R²=0.95).
  • pTx excitation vectors were calculated and transmitted wirelessly within 60ms.
  • RF heating was significantly reduced (0.03-0.14 K) compared to worst-case scenarios (0.52-3.33 K), with comparable image quality (scores ≥0.80/1.00).

Conclusions:

  • Sensor-equipped implants communicating with MRI scanners enhance patient safety.
  • The proposed method offers a fast and automated approach to reduce RF heating.
  • This technology can alleviate the burden on MRI personnel and improve the safety of MRI for patients with AIMDs.