Investigation into the mechanisms of tissue atomization by high-intensity focused ultrasound

Julianna C. Simon, Oleg A. Sapozhnikov, Yak Nam Wang, Vera A. Khokhlova, Lawrence A. Crum, Michael R. Bailey

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Ultrasonic atomization, or the emission of a fog of droplets, was recently proposed to explain tissue fractionation in boiling histotripsy. However, even though liquid atomization has been studied extensively, the mechanisms underlying tissue atomization remain unclear. In the work described here, high-speed photography and overpressure were used to evaluate the role of bubbles in tissue atomization. As static pressure increased, the degree of fractionation decreased, and the exvivo tissue became thermally denatured. The effect of surface wetness on atomization was also evaluated invivo and in tissue-mimicking gels, where surface wetness was found to enhance atomization by forming surface instabilities that augment cavitation. In addition, experimental results indicated that wetting collagenous tissues, such as the liver capsule, allowed atomization to breach such barriers. These results highlight the importance of bubbles and surface instabilities in atomization and could be used to enhance boiling histotripsy for transition to clinical use.

Original languageEnglish (US)
Pages (from-to)1372-1385
Number of pages14
JournalUltrasound in Medicine and Biology
Volume41
Issue number5
DOIs
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiological and Ultrasound Technology
  • Acoustics and Ultrasonics

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