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Reduction of RF Heating Near Bilateral Deep Brain Stimulation Leads Using Two-Channel RF Shimming at 3T.

C D E van Speybroeck1, W Roskamp1,2,3, E Arts3

  • 1Department of Medical Imaging, Radboud University Medical Center, Nijmegen, the Netherlands.

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Summary

This study optimized radiofrequency (RF) shimming for 3T MRI in patients with bilateral deep brain stimulation (DBS) leads. Tailored settings minimize RF heating and image artifacts, improving safety and imaging performance.

Keywords:
MRIdeep brain stimulationradiofrequency heatingsafety

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Neurosurgery

Background:

  • 3T MRI safety is limited in patients with bilateral deep brain stimulation (DBS) leads due to radiofrequency (RF) heating concerns.
  • Existing RF shimming methods struggle to completely nullify RF heating with multiple DBS leads.
  • Minimizing RF heating is crucial for safe and effective MRI in this patient population.

Purpose of the Study:

  • To develop and evaluate a method for minimizing RF heating and optimizing imaging performance in bilateral DBS lead configurations during 3T MRI.
  • To utilize two-channel RF shimming with low-specific absorption rate (SAR) calibration scans for tailored RF current estimation.
  • To enhance safety and diagnostic capabilities for patients with bilateral DBS during MRI.

Main Methods:

  • Constructed an anthropomorphic phantom with bilateral DBS leads and fiber-optic temperature sensors.
  • Determined optimal two-channel RF shim settings using a low-SAR calibration protocol across multiple phantom orientations.
  • Evaluated shim settings by measuring RF heating during high-SAR sequences and assessing image artifacts, comparing to quadrature mode.

Main Results:

  • Tailored RF shim settings successfully minimized local RF heating for both DBS leads simultaneously in all tested orientations.
  • Image artifact analysis confirmed the effectiveness of the optimized shimming protocol.
  • Measured heating curves demonstrated significant reduction in RF-induced heating compared to standard methods.

Conclusions:

  • Optimized two-channel RF shimming effectively minimizes RF heating and image artifacts in bilateral DBS lead configurations at 3T MRI.
  • This approach enhances imaging performance and safety for patients with bilateral DBS.
  • The developed workflow offers potential for patient-specific MRI protocols, enabling safer 3T imaging.