Fig. 8.

Threshold acoustic intensity required to induce changes in neural excitability for low frequency US stimulation. (a) Variation of output acoustic intensity as a function of input acoustic pressure for continuous ultrasound (-c) and pulsed ultrasound (-p) at different frequencies. Frequency and output acoustic intensity are inversely proportional whereby higher frequencies generate less output intensity, and continuous ultrasound stimulation produces higher intensities than pulsed stimulation. (b) Output acoustic intensity as a function of increasing frequency at 1 MPa of input acoustic pressure.