Cavitation inception by dual-frequency excitation in high-intensity focused ultrasound treatment

Ryo Takagi, Shin Yoshizawa, Shin Ichiro Umemura

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


In our previous study, we proposed a "triggered high-intensity focused ultrasound (HIFU)" exposure sequence, in which a high-intensity triggering pulse was irradiated just before CW heating waves, to accelerate HIFU treatment. In this study, the second-harmonic was superimposed to the triggering pulse, and the cavitation threshold was investigated by comparing different schemes of second-harmonic superimposition including the case of single-frequency exposure through detecting the subharmonic emission and high-speed camera observation. The experimental results show that cavitation bubbles can be generated most efficiently by using negative-peak-pressure emphasized waves followed by positive-peak-pressure emphasized waves.

Original languageEnglish
Article number07HF14
JournalJapanese journal of applied physics
Issue number7 PART 2
Publication statusPublished - 2011 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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