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Related Experiment Videos

The noise level in magnetic stimulation

J Starck1, I Rimpiläinen, I Pyykkö

  • 1Finnish Institute of Occupational Health, Department of Physics, Vantaa, Finland.

Scandinavian Audiology
|January 1, 1996
PubMed
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Magnetic stimulator coils produce impulse noise that may affect hearing. However, the risk to patients and examiners is considered small, especially with hearing protection.

Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Stimulating coils in magnetic stimulation devices generate impulse noise.
  • This noise poses a potential risk to the hearing of both patients and examiners.
  • Understanding the sound pressure levels is crucial for assessing audiological safety.

Purpose of the Study:

  • To evaluate the potential hearing risk from impulse noise of magnetic stimulator coils.
  • To measure A-weighted peak sound pressure levels (SPL) from different magnetic stimulator coils.
  • To compare measured SPLs against established occupational noise exposure limits.

Main Methods:

  • Measured A-weighted peak sound pressure levels (SPL) from five different magnetic stimulator coils.
  • Tested coils at 100% stimulation intensity and distances of 10 cm and 40 cm.

Related Experiment Videos

  • Calculated potential daily exposure based on American Conference of Governmental Industrial Hygienists (ACGIH) guidelines.

    • Main Results:

    • Peak SPLs at 10 cm ranged from 110 dB (Dantec, Magstim) to 132 dB (Cadwell MES-10).
    • Sound levels decreased with distance, closely following the inverse square law (average 14 dB decrease at 40 cm).
    • Calculated daily allowable stimuli (1000-10,000) suggest exceeding limits is unlikely in typical clinical settings.

    Conclusions:

    • The risk of hearing damage from magnetic stimulator coil noise is considered small for patients and operators.
    • Hearing protection, even lightweight, can further mitigate potential risks.
    • Adherence to safety guidelines and use of protective measures are recommended.