The relation between cavitation and platelet aggregation during exposure to high-intensity focused ultrasound

Sandra L. Poliachik, Wayne Chandler, Ryan J. Ollos, Michael R. Bailey, Lawrence A. Crum

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Our previous study showed that high-intensity focused ultrasound (HIFU) is capable of producing "primary acoustic hemostasis" in the form of ultrasound (US)-induced platelet activation, aggregation and adhesion to a collagen-coated surface. In the current study, 1.1 MHz continuous-wave HIFU was used to investigate the role of cavitation as a mechanism for platelet aggregation in samples of platelet-rich plasma. A 5 MHz passive cavitation detector was used to monitor cavitation activity and laser aggregometry was used to measure platelet aggregation. Using spatial average intensities from 0 to 3350 W/cm2, the effects of HIFU-induced cavitation on platelet aggregation were investigated by enhancing cavitation activity through use of US contrast agents and by limiting cavitation activity through use of an overpressure system. Our results show that increased cavitation activity lowers the intensity threshold to produce platelet aggregation and decreased cavitation activity in the overpressure system raises the intensity threshold for platelet aggregation. (E-mail: poliachi@u.washington.edu)

Original languageEnglish (US)
Pages (from-to)261-269
Number of pages9
JournalUltrasound in Medicine and Biology
Volume30
Issue number2
DOIs
StatePublished - Feb 1 2004

Keywords

  • Bioeffects
  • Cavitation
  • HIFU
  • Platelets
  • Ultrasound

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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