The MRDust: An Implantable Neural Interface Powered via Focused Ultrasound with Data Communication via MR Image Modulation

We propose a new device for neuroscience studies: the MRDust, a sub-mm wireless programmable neural recording mote with on-device memory and compute. It receives power via focused ultrasound, records neural signals in burst mode, and uses a micro-coil to perturb local magnetic fields to achieve data uplink via dynamic MRI signal modulation. We demonstrate proof-of-concept experiments in which digital information is encoded in images of an SE-EPI dynamic sequence, and in which a piezoelectric harvester can harvest enough ultrasonic power to sustain device operation, and receive control signals through amplitude modulation.