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Related Experiment Video

Updated: May 30, 2025

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Ringing suppression design for pulse parameter controllable transcranial magnetic stimulation.

Ziqi Zhang1, Hongfa Ding1, Zhou He1

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

Journal of Neural Engineering
|January 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel design to suppress ringing in controllable transcranial magnetic stimulation (cTMS) devices. The method significantly reduces ringing duration, improving stimulation efficacy and precision.

Keywords:
pulse parameter controllable TMS (cTMS)pulse waveformringing suppressionstimulation selectivitytranscranial magnetic stimulation (TMS)

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Electrical Engineering

Background:

  • Controllable transcranial magnetic stimulation (cTMS) devices utilize semiconductor switches, but ringing occurs due to coil inductance and snubber capacitors.
  • This ringing artifact can negatively impact stimulation efficacy and the precision of targeted brain activation.

Purpose of the Study:

  • To develop and validate a ringing suppression design method for cTMS devices.
  • To minimize the impact of waveform ringing on stimulation efficacy and accuracy.

Main Methods:

  • A three-pronged approach was implemented: laminated busbars to reduce parasitic inductance, improved unidirectional snubber circuits to eliminate ringing loops, and a converter to recycle snubber energy.
  • These methods target the source of ringing energy within the cTMS device architecture.

Main Results:

  • The ringing duration was dramatically reduced from approximately 1000 μs to under 30 μs.
  • The realized waveform more closely approximated the ideal waveform, minimizing stimulation effect variability.
  • Uncontrollable deviations in targeted activation regions were reduced.

Conclusions:

  • The developed ringing suppression method effectively enhances the waveform quality in cTMS devices.
  • This technique offers improved controllability of stimulation efficacy and can be readily applied to other cTMS systems.