Abstract
The current work aims to provide conventional and high definition (HD) transcranial direct current stimulation (tDCS) for the rehabilitation of patients, suffering from cerebrovascular accident or impaired hemodynamic conditions. The paper presents a computational model to study the electric field distribution on the targeted brain cortex. The proposed computational model is used to find out the electric field distribution due to conventional tDCS and HD-tDCS electrode configuration. The main objective of this computational model is to find out the focality in terms of affected surface area due to electric field distribution in the region of targeted brain cortex. In the present work, different sizes (4 × 4, 3 × 3 and 2 × 2 cm2) of rectangular sponge pads are used to compute the electric field distribution at the targeted brain cortex by using bipolar tDCS method. The percentage pixels of affected area because of different sized electrode configurations used in bipolar tDCS has been estimated. Instead of large sponge pad, the small size electrode is used for high definition multi-electrode configurations to compute electric field distribution on same target region and also estimate the percentage of affected pixel surface area. In conventional bipolar tDCS method as the size of sponge pad decreases, focality in the affected surface area improves slightly. However, in case of multi-electrode HD-tDCS configuration, focality in the affected surface area is improved with high rate. In current work 4 × 1 HD-tDCS multi-electrode configuration is used to compute the electric field distribution and estimate percentage affected pixel surface area of the targeted region of interest. Focality in terms of affected percentage pixel surface area is better in 4 × 1 HD-tDCS method with 0.7323% affected skull tissue pixels area as compared to different sized rectangular sponge pad based bipolar conventional tDCS where 17.4059% affected pixel area has been achieved with 2×2 cm2rectangular sponge pad electrode.
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