Analysis of Electric Field Focalization Induced by Transcranial Magneto-Acoustical-Electrical Stimulation Parameters

Transcranial magnetic-acoustical-electrical stimulation is a new noninvasive brain modulation method with high spatial resolution and high penetration depth. However, the effect of electric field focalization induced by transcranial magneto-acoustical-electrical stimulation parameters is still unclear. In this paper, the electric field generated by transcranial magnetic-acoustical-electrical stimulation is simulated. The influence of the phased array transducer parameters on the induced electric field distribution is analyzed. The induced electric field distribution caused by different phased array parameters was calculated. The distribution characteristics of the induced electric field are analyzed from the radial and axial directions of the preset focusing point. The simulation results show that induced electric field intensity in the focusing region increases with the length and width of array elements and decreases with the array gap widening. There is a significant negative correlation between the size of focal region and the gap of the array elements. The correlation between phased array parameters and focusing performance is analyzed in this paper, which provides reference and theoretical guidance for research on improving the focusing property of induced electric field.