Enhancement of cavitation inception by second-harmonic superimposition

Shin Yoshizawa, Ryo Takagi, Jun Yasuda, Shin ichiro Umemura

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

High-intensity focused ultrasound (HIFU) treatment with cavitation bubbles has attracted much attention because they enhance the therapeutic efficacy of HIFU. Negative acoustic pressure is known toprimarily determine the cavitation threshold. However, it is hard to generate highly negative acoustic pressure over the cavitation threshold by ultrasonic focusing because of the nonlinear propagation. The sequence, starting with the second-harmonic superimposed pulse waves enhancing the peak negative pressure, and followed by those enhancing the peak positive pressure, demonstrated the highest efficiency in cavitation inception. A high speed camera showed that the negative-pressure enhanced pulse waves produced a small cloud of cavitated microbubbles at the first stage and that the positive-pressure enhanced pulse waves expanded the microbubble cloud at the second stage.

本文言語English
ホスト出版物のタイトルNonlinear Acoustics
ホスト出版物のサブタイトルState-of-the-Art and Perspectives, ISNA 2012 - 19th International Symposium on Nonlinear Acoustics
ページ235-238
ページ数4
1
DOI
出版ステータスPublished - 2012 5 1

出版物シリーズ

名前AIP Conference Proceedings
番号1
1474
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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