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Magnetic field strength and reproducibility of neodymium magnets useful for transcranial static magnetic field stimulation of the human cortex.

Publication ,  Journal Article
Rivadulla, C; Foffani, G; Oliviero, A
Published in: Neuromodulation
July 2014

OBJECTIVE: The application of transcranial static magnetic field stimulation (tSMS) in humans reduces the excitability of the motor cortex for a few minutes after the end of stimulation. However, when tSMS is applied in humans, the cortex is at least 2 cm away, so most of the strength of the magnetic field will not reach the target. The main objective of the study was to measure the strength and reproducibility of static magnetic fields produced by commercial neodymium magnets. METHODS: We measured the strength and reproducibility of static magnetic fields produced by four different types of neodymium cylindrical magnets using a magnetic field-to-voltage transducer. RESULTS: Magnetic field strength depended on magnet size. At distances <1.5 cm, the magnetic field strength was affected by the presence of central holes (potentially useful for recording electroencephalograms). At distances >1.5 cm, the measurements made on the cylinder axis and 1.5 cm off the axis were comparable. The reproducibility of the results (i.e., the consistency of the field strength across magnets of the same size) was very high. CONCLUSIONS: These measurements offer a quantitative empirical reference for developing devices useful for tSMS protocols in both humans and animals.

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Published In

Neuromodulation

DOI

EISSN

1525-1403

Publication Date

July 2014

Volume

17

Issue

5

Start / End Page

438 / 441

Location

United States

Related Subject Headings

  • Transcranial Magnetic Stimulation
  • Reproducibility of Results
  • Neurology & Neurosurgery
  • Neodymium
  • Magnetic Fields
  • Humans
  • Cerebral Cortex
  • Biophysical Phenomena
  • 3209 Neurosciences
  • 3202 Clinical sciences
 

Citation

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ICMJE
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Rivadulla, C., Foffani, G., & Oliviero, A. (2014). Magnetic field strength and reproducibility of neodymium magnets useful for transcranial static magnetic field stimulation of the human cortex. Neuromodulation, 17(5), 438–441. https://doi.org/10.1111/ner.12125
Rivadulla, Casto, Guglielmo Foffani, and Antonio Oliviero. “Magnetic field strength and reproducibility of neodymium magnets useful for transcranial static magnetic field stimulation of the human cortex.Neuromodulation 17, no. 5 (July 2014): 438–41. https://doi.org/10.1111/ner.12125.
Rivadulla, Casto, et al. “Magnetic field strength and reproducibility of neodymium magnets useful for transcranial static magnetic field stimulation of the human cortex.Neuromodulation, vol. 17, no. 5, July 2014, pp. 438–41. Pubmed, doi:10.1111/ner.12125.
Journal cover image

Published In

Neuromodulation

DOI

EISSN

1525-1403

Publication Date

July 2014

Volume

17

Issue

5

Start / End Page

438 / 441

Location

United States

Related Subject Headings

  • Transcranial Magnetic Stimulation
  • Reproducibility of Results
  • Neurology & Neurosurgery
  • Neodymium
  • Magnetic Fields
  • Humans
  • Cerebral Cortex
  • Biophysical Phenomena
  • 3209 Neurosciences
  • 3202 Clinical sciences