Role of periodic shock waves in passive acoustic mapping of cavitation

Jae Hee Song (Lead / Corresponding author), Sandy Cochran, Paul Prentice, Grame McLeod, George Corner

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    The purpose of this work was to investigate the mechanistic, bubble-based source for passive acoustic mapping (PAM) reconstruction. Single cavitation clouds driven with f0 = 254 kHz focused ultrasound, responding in the f0/2 and f0/3 subharmonic regimes, were monitored with an ultrasound scanning system and array transducer for PAM reconstruction. Simultaneously, high-speed imaging at 0.5×106 frames per second, and a single element broadband passive cavitation detector (PCD) were used to identify key signals emitted by the cloud, and confirm that a single cloud had formed. The high-speed imaging and PCD data clearly demonstrate that the cloud generates periodic shock waves (PSWs) at frequencies subharmonic to f0, along with acoustic emissions at f0. The post-beamformed signal of PAM reveals features that are separated by a time interval approximately equal to the period of shock emission. We conclude that PSWs are a strong candidate for mediating PAM, which crucially, can be reconciled with reports in the literature of discrete, discontinuous cavitation activity.

    Original languageEnglish
    Title of host publication2016 IEEE International Ultrasonics Symposium (IUS)
    PublisherIEEE Computer Society
    Pages1-4
    Number of pages4
    Volume2016-November
    ISBN (Electronic)9781467398978
    DOIs
    Publication statusPublished - 3 Nov 2016
    Event2016 IEEE International Ultrasonics Symposium, IUS 2016 - Tours, France
    Duration: 18 Sep 201621 Sep 2016

    Conference

    Conference2016 IEEE International Ultrasonics Symposium, IUS 2016
    CountryFrance
    CityTours
    Period18/09/1621/09/16

    Keywords

    • cavitation
    • passive acoustic mapping
    • shock wave

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