Effect of triangular electrode schemes on Broca's cortical stimulation: conventional and HD-tDCS study

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Physics

Background:

• Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique used therapeutically for cognitive diseases, psychiatric disorders, and stroke-related disabilities.
• Optimizing electrode placement and design is crucial for maximizing the efficacy and safety of tDCS.

Purpose of the Study:

• To propose and evaluate new electrode schemes for transcranial direct current stimulation (tDCS) to enhance cortical stimulation.
• To investigate the impact of different electrode shapes and arrangements on electric field distribution and current density.

Main Methods:

• Magnetic Resonance Imaging (MRI) scans were segmented to create patient-specific head models.
• A tissue correction routine algorithm was employed for accurate modeling of electrical properties.
• Various electrode configurations, including rectangular, circular, and triangular patches, were designed and simulated.
• Electric field strength and current density were calculated for conventional and high-definition tDCS (HD-tDCS) setups.

Main Results:

• Triangular electrodes in a specific anodal arrangement (triangular 4×1 HD-tDCS) generated a stronger electric field compared to other conventional designs.
• The proposed empty triangular electrode schemes demonstrated a substantial improvement in current density for both conventional and HD-tDCS.
• The optimized electrode designs led to increased current density distribution in the targeted cortical areas.

Conclusions:

• Novel empty triangular electrode schemes offer a promising approach to improve current density and electric field distribution in tDCS.
• The findings suggest that optimized electrode geometry can significantly enhance the therapeutic potential of tDCS for various neurological and psychiatric conditions.