Figure 7:

(A) Example cavitation probability curves, fit to the relative frequency of cavitation events, as a function of peak negative pressure of acoustic pulses, observed while insonating coupling baths containing various concentrations of magnetite nanoparticles in a low duty cycle regime. (B) The 0.5 cavitation probability threshold pressure, derived from all fits computed from this insonation scheme, including those shown in (A), as a function of nanoparticle concentration. The nanoparticles reduce this threshold by 15 ± 7 %. For comparison, the high duty cycle power thresholds presented Figure 6 are converted into pressure and reproduced here.