Effects of TMS coil geometry on stimulation specificity

Area of Science:

• Neuroscience
• Biomedical Engineering
• Medical Devices

Background:

• Transcranial magnetic stimulation (TMS) is a key tool in cognitive neuroscience and clinical practice.
• Current TMS spatial resolution is limited to millimeters.
• Improving TMS coil specificity is crucial for targeted neural circuit modulation.

Purpose of the Study:

• To present a practical multilayer framework for designing miniaturized TMS coils.
• To investigate the impact of coil geometry and bending angle on stimulation specificity.
• To propose a novel stimulation coil design for enhanced precision.

Main Methods:

• Development of a multilayer framework for coil design using braided ultrafine wires.
• Finite element method (FEM) simulations to analyze coil performance.
• Evaluation of coil bending angle effects on spatial activation.
• Design and simulation of a novel one-degree-of-freedom coil.

Main Results:

• The proposed framework enables the design of miniaturized TMS coils.
• Coil bending angle significantly affects stimulation specificity.
• The novel one-degree-of-freedom coil demonstrates improved specificity compared to conventional coils.
• FEM simulations provide realistic predictions of coil performance.

Conclusions:

• The developed framework offers a practical approach to TMS coil miniaturization and design.
• Enhanced coil specificity is achievable through optimized geometry and novel designs.
• The novel coil design shows promise for real-time feedback in brain-machine interfaces.
• This work advances the potential of TMS for precise neural circuit manipulation.