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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Ultrasonics. 2014 May 6;54(7):1938–1944. doi: 10.1016/j.ultras.2014.04.022

Figure 4.

Figure 4

Decrease in subharmonic signal amplitude for Definity as a function of frequency and acoustic power (n = 3) when hydrostatic pressures were varied from 0 to 50 mmHg.