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• W2041055936 abstract "In transcranial magnetic stimulation (TMS), the stimulation-coil current is typically increased from 0 to over 5000 A in less than 100 μs. At the peak current, the energy stored in the magnetic field is over 300 J. Thus, the average power during a pulse exceeds 3 MW; the stimulator needs to be built from high-power electronics. The power requirements often limit the duration and frequency of repetitive TMS, for example, via coil heating.We introduce a method for finding the minimum-energy solution for a TMS coil with given focality constraints.This optimization is performed by using a spherically symmetric head model and by expressing the coil as a continuous surface current density, which is eventually discretized to form the coil windings. For the optimization, we defined TMS focality separately for the directions parallel and perpendicular to the field direction at the maximum of induced electric field.The computational model used for optimization was verified by manufacturing a prototype coil and measuring the electric field it induces in a spherically symmetric conductor. The optimized coil design requires significantly less power than existing TMS coil designs (a 73% reduction compared to an existing TMS coil with similar focality).The described method allows for more efficient, more focal TMS coils, which may reduce coil heating and the coil click." @default.
• W2041055936 created "2016-06-24" @default.
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• W2041055936 date "2015-01-01" @default.
• W2041055936 modified "2023-10-02" @default.
• W2041055936 title "Minimum-energy Coils for Transcranial Magnetic Stimulation: Application to Focal Stimulation" @default.
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• W2041055936 doi "https://doi.org/10.1016/j.brs.2014.10.002" @default.
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