Evaluation of the Interaction between RF Coils and Multiple TMS Coils at 9.4T

Motivation: Recently, The research methods of transcranial magnetic stimulation(TMS)/fMRI in ultra-high fields are receiving increasing attention. Goal(s): However, as the magnetic field strength increases, the interference problem between the TMS coil and the radio frequency（RF） coil will also become increasingly apparent. Approach: We designed two types of TMS coils and 9.4T human RF coil using the target field method, and evaluated the impact between the TMS coil and the RF coil using electromagnetic simulation based on the human head model. Results: We have established a method for evaluating the interaction between RF coils and TMS coils in ultra-high fields. Impact: Our work explores the combined use of TMS/fMRI in ultra-high fields, providing a non-invasive and precise approach for the microscopic study of brain nerve activity under TMS, and also providing a basis for the regulation of brain nerves.