Coding for improved focusing of ultrasound, and an application to neurostimulation

Focused ultrasound has been known to be able to do neurostimulation for many decades. Almost all ultrasound stimulation systems in this context, however, use the "phased-array" technique where phases of multiple transducers are aligned so they interfere constructively at the desired location. This paper explores the advantage of modulating ultrasound waves using pseudo-random sequences using a linear arrangement of transducers.