Enhancement of localized heating by ultrasonically induced cavitation in high intensity focused ultrasound treatment

Ryo Takagi, Shin Yoshizawa, Shinichiro Umemura

研究成果: Article査読

49 被引用数 (Scopus)

抄録

There are reports that ultrasonically induced cavitation bubbles locally enhance tissue heating in high intensity focused ultrasound (HIFU) treatment. In this study, a high-intensity burst (named "a triggering pulse") above the cavitation threshold was used to trigger cavitation. Immediately after that, CW ultrasound (named "heating waves"), at an intensity level and duration typical for conventional HIFU ablation was irradiated. Before the ablating sonication, it is necessary to determine the optimum intensity and duration of the triggering pulse. Immediately after a test triggering pulse, low-intensity CW ultrasound (named "a sustaining pulse") was irradiated for a short duration of time, and we detected the cavitation noises (subharmonics and higher harmonics) generated in the focus spot. The relationship between the 1/2 subharmonic signal amplitude and the coagulation volume after the ablating sonication was investigated. The result of this experiment suggests that we can optimize the triggering pulse by detecting the 1/2 subharmonic signal amplitude.

本文言語English
論文番号07HF21
ジャーナルJapanese journal of applied physics
49
7 PART 2
DOI
出版ステータスPublished - 2010 7 1

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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