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Transcranial magnetic stimulation has important applications in clinical diagnosis, clinical treatment and scientific research. In transcranial magnetic stimulation, the geometric configuration of the coil is particularly important, which determines the stimulation intensity and focalization. To improve these two indicators of transcranial magnetic stimulation, a novel coil is proposed in this paper, namely semiellipse coil pair with eccentric windings(SEPEW). SEPEW adopts a semi-elliptical coil structure with eccentric windings. Different from the traditional planar coil, SEPEW adopts a curved structure, which is more ergonomic. The geometric parameters of SEPEW are optimized through the finite-element method by analyzing the spatial distributions of the intracranial induced electrical field generated by SEPEW with different geometric structure. Results prove that by designing and optimizing the geometric structure of SEPEW, the SEPEW coil can obtain better stimulation intensity and focalization in comparison to the traditional figure of eight coil under the same coil power loss.
