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Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model

Publication ,  Journal Article
Goetz, SM; Weyh, T; Afinowi, IAA; Herzog, HG
Published in: IEEE Transactions on Magnetics
June 1, 2014

Magnetic stimulation is gaining importance as an alternative to electrical stimulation in neurorehabilitation because it offers deep penetration and low pain. However, presently available equipment is not ideal for this purpose and sometimes even unsuitable. Furthermore, it is not known what physical conditions a coil has to provide for efficient stimulation. To solve these two problems, we set up a detailed 3-D computational model of the thigh to evaluate various coil designs with previously reported experimental performance. Comparison of the stimulation results with known experimental performance shows that a high absolute electric field seems to be sufficient for effective stimulation. Coil-generated field gradients, in contrast, do apparently not play a role. As a more appropriate metric, the electromagnetic coupling between different coil designs and the muscles of the thigh is found to be characteristic and explains the previously reported experimental performance differences. Furthermore, it is a good predictor for the achievable muscle torque (more than 99% correlation), whereas the gradient fails in this context. Accordingly, the model is able to test the performance of coils virtually and reveal both general relationships as well as design rules. In addition, the coupling factor formalism predicts a theoretical maximum level of the possible field induction and thus a guideline for potential improvements in the future.

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Published In

IEEE Transactions on Magnetics

DOI

ISSN

0018-9464

Publication Date

June 1, 2014

Volume

50

Issue

6

Related Subject Headings

  • Applied Physics
  • 09 Engineering
  • 02 Physical Sciences
 

Citation

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Goetz, S. M., Weyh, T., Afinowi, I. A. A., & Herzog, H. G. (2014). Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model. IEEE Transactions on Magnetics, 50(6). https://doi.org/10.1109/TMAG.2014.2300441
Goetz, S. M., T. Weyh, I. A. A. Afinowi, and H. G. Herzog. “Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model.” IEEE Transactions on Magnetics 50, no. 6 (June 1, 2014). https://doi.org/10.1109/TMAG.2014.2300441.
Goetz SM, Weyh T, Afinowi IAA, Herzog HG. Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model. IEEE Transactions on Magnetics. 2014 Jun 1;50(6).
Goetz, S. M., et al. “Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model.” IEEE Transactions on Magnetics, vol. 50, no. 6, June 2014. Scopus, doi:10.1109/TMAG.2014.2300441.
Goetz SM, Weyh T, Afinowi IAA, Herzog HG. Coil Design for Neuromuscular Magnetic Stimulation Based on a Detailed 3-D Thigh Model. IEEE Transactions on Magnetics. 2014 Jun 1;50(6).

Published In

IEEE Transactions on Magnetics

DOI

ISSN

0018-9464

Publication Date

June 1, 2014

Volume

50

Issue

6

Related Subject Headings

  • Applied Physics
  • 09 Engineering
  • 02 Physical Sciences