Accelerated Rotational Field Deep TMS for Treating OCD

Rotational field TMS (rfTMS) is a novel technology where two orthogonal coils are operated with a 90 phase shift between them. The combined electric field vector of rfTMS from both coils rotates up to a complete cycle during the TMS pulse. This method overcomes the inherent limitation of conventional unidirectional TMS by influencing neurons in various orientations (Roth et al., 2020b). This unique advance bears enormous potential for therapeutic applications in various neuropsychiatric disorders. The coil Array includes the H7 coil as the lower coil, and an upper coil perpendicular to it. Hence, the HAC/H7 coil Array induces similar electric field distribution and affects the same brain structures as the H7 coil, but stimulates neurons in various orientations within these regions.

Participants assigned to this intervention will receive sham stimulation using a BrainsWay Deep TMS sham coil that mimics the sensation and acoustic properties of active stimulation but does not deliver effective magnetic pulses to the brain. This condition is used as a placebo control to blind participants and investigators.