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Related Experiment Video

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Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation
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Safe exposure distances for transcranial magnetic stimulation based on computer simulations.

Iam Palatnik de Sousa1, Carlos R H Barbosa1, Elisabeth Costa Monteiro1

  • 1Postgraduate Program in Metrology, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, Brazil.

Peerj
|June 26, 2018
PubMed
Summary

This study simulated transcranial magnetic stimulation (TMS) device compliance with 2010 International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines. Updated safe distances for occupational exposure were calculated and compared to previous estimates.

Keywords:
Exposure limitsMetrologySafetySpatial distributionTranscranial magnetic stimulation

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Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Radiation Protection

Background:

  • Transcranial magnetic stimulation (TMS) is a non-invasive brain stimulation technique.
  • Adherence to safety guidelines, such as those from the International Commission on Non-Ionizing Radiation Protection (ICNIRP), is crucial for safe TMS device operation.
  • Previous safety distance estimates may not reflect the latest ICNIRP guidelines.

Purpose of the Study:

  • To assess the compliance of a transcranial magnetic stimulation (TMS) device with the 2010 International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines.
  • To update and compare safe distance estimates for occupational exposure using current safety standards.
  • To validate simulation data against existing literature for a specific TMS coil (Medtronic MCB-70).

Main Methods:

  • Computer simulation was employed to model the electromagnetic field generated by the TMS device.
  • Three-dimensional (3D) data from the simulation were analyzed.
  • The simulated results were compared with the 2003 and 2010 ICNIRP exposure guidelines and previously published data.

Main Results:

  • The simulation yielded updated safe occupational exposure distances of 1.46 m (based on 2003 ICNIRP guidelines) and 0.96 m (based on 2010 ICNIRP guidelines).
  • These derived distances were compared to safe distances reported in prior studies.
  • The 3D simulation data for the Medtronic MCB-70 coil were consistent with existing literature.

Conclusions:

  • The 2010 ICNIRP guidelines necessitate a reduced safe occupational exposure distance for the studied TMS device compared to the 2003 guidelines.
  • Computer simulations provide a valuable tool for updating and verifying TMS safety distances.
  • This research contributes to ensuring the safe application of TMS technology in clinical and research settings.