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. 2021 Dec 20;82:105882. doi: 10.1016/j.ultsonch.2021.105882

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© 2021 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

PMC Copyright notice

Fig. 6 — SCI temporal distribution regulated by the amplitude (corresponding to peak negative pressure) of the acoustic pulse in PNP-based closed-loop feedback controller. A1-A3. shows the temporal change of the amplitude of the acoustic pulse, SCI and the spectrum of SC signal when using PNP-based closed-loop feedback controller. B1-B4. Performance comparison of open-loop system, PNP-based closed-loop feedback controller and PL-based closed-loop feedback controller (B1. stability ratio; B2. concentration ratio; B3. S/B’; B4. broadband emissions). ***Statistically significant difference (p < 0.001). NS: no statistical significance. C1. Comparison of the accumulative spectrum produced by the first 100 pulses between open-loop system and PL-based closed-loop controller. C2. Comparison of the accumulative spectrum produced by the first 100 pulses between open-loop system and PNP-based closed-loop controller.