A Multifunction Dense Array System With Reconfigurable Depth of Penetration

Noninvasive neuromodulation techniques such as Transcranial Magnetic Stimulation are enabled by electromagnetic induction with applications in neuroscience research and the treatment of neurological disorders. Current systems effective but continues on improving key performance metrics precise targeting, focality, depth penetration. Additional functions also being studied; tunable excitation field patterning, reconfigurable penetration, multiple sites, power efficient waveforms reduced extraneous excitation. Multichannel, multi-coil arrays show promise achieving many these parameters one multifunctional array opposed to single-function commercial coils (circular, figure-8 or H coil) used today. As such, our central focus is determine whether multifunction dense arrays, despite their challenges, a tractable technical approach for future systems. Therefore, results this paper twofold. First, we report design, fabrication demonstration scalable multichannel (12 channels) system assess potential perform system. Second, demonstrate that penetration magnetic can be reconfigured varying current magnitude phase smaller coil diameters achieve same decay profile larger diameter coil. Only simulations exist literature date, best knowledge, first measurements hexagonal shaped have increased over circular coil-based arrays.