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Intensity and Localization of Eddy Currents in Transcranial Magnetic Stimulation to the Cerebellum

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5 Author(s)
Sekino, M. ; Dept. of Biomed. Eng., Univ. of Tokyo ; Hirata, M. ; Sakihara, K. ; Yorifuji, S.
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We performed numerical simulations of the eddy current induced by transcranial magnetic stimulation (TMS) to the cerebellum. Solutions were obtained on a three-dimensional human head model with inhomogeneous conductivity. The stimulating coil consisted of a pair of circular coil elements with a diameter of 110 mm. Electric current applied to the coil had an intensity of 44.2 kA middot Turn, which resulted in a magnetic field intensity of 0.56 T at the center of a coil element. The maximum current density in the cerebellum was 2.9 A/m2. Distribution of the eddy current in the cerebellum was limited to approximately 1 cm beneath the surface of the cerebellum. The eddy current had a localized distribution in the cerebellum, while the magnetic field had a broad distribution

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Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 10 )