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A measure of acoustic noise generated from transcranial magnetic stimulation coils.

Author information

Affiliations

  • 1. Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
      Authors
    • Dhamne SC 1
    • Kothare RS 1
    • Yu C 1
    (3 authors)
  • 2. Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Graduate Institute of Neural Regenerative Medicine, Taipei Medical University, Taipei, Taiwan.
      Authors
    • Hsieh TH 2
    (1 author)
  • 3. Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
      Authors
    • Anastasio EM 3
    • Oberman L 3
    (2 authors)
  • 4. Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA; Institut Universitari de Neurorehabilitació Guttmann, Universidad Autónoma de Barcelona, Badalona, Spain.
      Authors
    • Pascual-Leone A 4
    (1 author)
  • 5. Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
      Authors
    • Rotenberg A 5
    (1 author)

Brain Stimulation, 29 Jan 2014, 7(3):432-434
https://doi.org/10.1016/j.brs.2014.01.056 PMID: 24582370 

A comment on this article appears in "Impulse noise of transcranial magnetic stimulation: measurement, safety, and auditory neuromodulation." Brain Stimul. 2015 Jan-Feb;8(1):161-3.

Abstract 

The intensity of sound emanating from the discharge of magnetic coils used in repetitive transcranial magnetic stimulation (rTMS) can potentially cause acoustic trauma. Per Occupational Safety and Health Administration (OSHA) standards for safety of noise exposure, hearing protection is recommended beyond restricted levels of noise and time limits. We measured the sound pressure levels (SPLs) from four rTMS coils with the goal of assessing if the acoustic artifact levels are of sufficient amplitude to warrant protection from acoustic trauma per OSHA standards. We studied the SPLs at two frequencies (5 and 10 Hz), three machine outputs (MO) (60, 80 and 100%), and two distances from the coil (5 and 10 cm). We found that the SPLs were louder at closer proximity from the coil and directly dependent on the MO. We also found that in all studied conditions, SPLs were lower than the OSHA permissible thresholds for short (<15 min) acoustic exposure, but at extremes of use, may generate sufficient noise to warrant ear protection with prolonged (>8 h) exposure.

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Read article at publisher's site: https://doi.org/10.1016/j.brs.2014.01.056

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