Skip to main content
. Author manuscript; available in PMC: 2013 Dec 2.
Published in final edited form as: Ultrasound Med Biol. 2008 Apr 16;34(9):10.1016/j.ultrasmedbio.2008.02.007. doi: 10.1016/j.ultrasmedbio.2008.02.007

Fig. 3.

Fig. 3

Time-frequency plots for representative passive cavitation detector (PCD) spectra at the three exposure conditions employed. Spectra are shown in dB relative to a measured noise level. All panels show narrow-band subharmonic emissions at 1.55 MHz and broadband emissions throughout the depicted frequency range. Panel (c) also shows low-frequency emissions in the kHz range for times ≥ 4 min. (a) 0.8 MPa nominal sonication amplitude. (b) 1.1 MPa. (c) 1.4 MPa.