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Related Experiment Video

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Multi-objective optimization method for coil current waveform of transcranial magnetic stimulation.

Ziqi Zhang1, Chang Liu2, Jihui Hu3

  • 1Wuhan National High Magnetic Field Center, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China.

Heliyon
|March 6, 2023
PubMed
Summary

This study optimized transcranial magnetic stimulation (TMS) waveforms to reduce hearing damage and equipment heat. The new waveforms significantly decrease coil vibration and noise, improving TMS treatment safety and efficiency.

Keywords:
Intracranial induced electric fieldJoule heatingMOPSOMembrane potentialTranscranial magnetic stimulationVibration energy

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Physics

Background:

  • Transcranial magnetic stimulation (TMS) is effective for mental health disorders.
  • TMS coil noise and heat generation pose risks to patient hearing and equipment efficiency.
  • Current TMS waveforms contribute to these issues.

Purpose of the Study:

  • To develop a multi-objective waveform optimization method for TMS.
  • To simultaneously reduce coil vibration (noise) and Joule heating.
  • To maintain therapeutic efficacy by ensuring adequate neuronal membrane potential.

Main Methods:

  • Analyzed TMS current waveforms to link current to vibration energy and Joule heating.
  • Utilized multi-objective particle swarm optimization (MOPSO) to find Pareto fronts.
  • Defined Joule heating and vibration energy as optimization objectives with neuronal response as a constraint.
  • Inversely deduced optimized current waveforms.

Main Results:

  • Optimized waveforms significantly reduced coil vibration and heating compared to conventional sine-based waveforms.
  • Experimental validation using a ringing suppression cTMS (RS-cTMS) platform confirmed feasibility.
  • Reduced pulse noise and extended equipment operational lifespan.

Conclusions:

  • The proposed multi-objective optimization effectively addresses TMS noise and heat issues.
  • Optimized waveforms enhance patient safety and equipment longevity.
  • Diversified TMS waveforms offer a new direction for TMS technology development.