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Current steering in the STN. A diffusion-tensor based 3D FEM of DBS was used to predict the VTA (red volume) from various percentage mixtures of current delivery through two DBS contacts in the STN. The stimulation parameters were held constant with 0.1 ms pulses delivered at 130 Hz and at a total current of 2 mA. VTAs are shown as a function of different current mixtures from 100%/0% (monopolar on contact 2) to 50%/50% (through contacts 1 and 2) to 0%/100% (monopolar on contact 1).
