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A deep brain stimulation-conditioned RF coil for 3T MRI.

Nicolas Kutscha1, Mirsad Mahmutovic1, Bhumi Bhusal2

  • 1Institute of Medical Physics and Radiation Protection, Department of Life Science Engineering, TH-Mittelhessen University of Applied Sciences, Giessen, Germany.

Magnetic Resonance in Medicine
|October 24, 2024
PubMed
Summary

A new MRI coil assembly for deep brain stimulation (DBS) imaging at 3 Tesla significantly reduces radiofrequency (RF) field heating near implants. This technology enhances safety and image quality for patients with DBS devices.

Keywords:
MRI RF coilMRI safetyactive implantable medical devices (AIMD)deep brain stimulation (DBS)finite element modeling (FEM)specific absorption rate (SAR)

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Neuroscience

Background:

  • Deep brain stimulation (DBS) is a crucial therapy for neurological disorders.
  • MRI is essential for monitoring DBS hardware and brain changes.
  • High RF fields in MRI can cause dangerous heating of DBS implants.

Purpose of the Study:

  • To develop and validate an MRI coil system for 3 Tesla imaging of DBS patients.
  • To minimize radiofrequency (RF) specific absorption rate (SAR) near DBS implants.
  • To maintain or improve image quality during DBS-conditioned MRI.

Main Methods:

  • Constructed a rotatable, linearly polarized birdcage transmitter with a 32-channel receive array.
  • Conducted bench-level tests (SNR maps, noise correlation, acceleration) and phantom experiments.
  • Performed electromagnetic simulations and phantom studies comparing the new coil with a standard body coil for SAR and temperature reduction.

Main Results:

  • The developed coil features a linear birdcage with a low electric field region aligned with DBS leads.
  • A close-fit 32-channel receive array provided high SNR and advanced encoding capabilities.
  • Electromagnetic simulations and phantom tests confirmed substantially reduced SAR and temperature near DBS implants compared to a circular polarized body coil.

Conclusions:

  • The novel 3T MRI coil assembly effectively reduces heat generation at DBS implants.
  • This DBS-conditioned imaging technology offers a safer approach for MRI in patients with these devices.
  • The system balances safety improvements with high-quality imaging performance.