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A 3D FEM model for calculation of electromagnetic fields in transmagnetic stimulation

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Kammer,  T
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Citation

Seilwinder, J., Kammer, T., Andrä, W., & Bellemann, M. (2002). A 3D FEM model for calculation of electromagnetic fields in transmagnetic stimulation. Biomedizinische Technik, 47(Supplement 1 Part 1), 285-288. doi:10.1515/bmte.2002.47.s1a.285.


Cite as: http://hdl.handle.net/21.11116/0000-0005-85B4-9
Abstract
We developed a realistic finite elements method (FEM) model of the brain for the calculation of electromagnetic fields in transcranial magnetic stimulation (TMS). A focal butterfly stimulation coil was X-rayed, parameterized, and modeled. The magnetic field components of the TMS coil were calculated and compared for validation to pointwise measurements of the magnetic fields with a Hall sensor. We found a mean deviation of 7.4% at an axial distance of 20 mm to the coil. A 3D brain model with the biological tissues of white and gray matter, bone, and cerebrospinal fluid was developed. At a current sweep of 1000 A in 120 microseconds, the maximum induced current density in gray matter was 177 mA/m2 and the strongest electric field gradient covered an area of 40 mm x 53 mm.