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Phase-change contrast agents for imaging and therapy.

Paul S Sheeran1, Paul A Dayton

  • 1Joint Department of Biomedical Engineering, The University of North Carolina, Chapel Hill, 27599, USA.

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Phase-change contrast agents (PCCAs) offer advanced ultrasound diagnostics and therapeutics by transforming from liquid droplets to gas bubbles. This acoustic droplet vaporization enables novel micro/nanoscale in vivo applications, expanding beyond traditional contrast agents.

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Area of Science:

  • Biomedical Engineering
  • Acoustic Physics
  • Nanotechnology

Background:

  • Microbubble contrast agents and liquid emulsions have limitations in current ultrasound applications.
  • Phase-change contrast agents (PCCAs) represent a novel class of ultrasound contrast agents.
  • PCCAs utilize acoustic droplet vaporization for unique diagnostic and therapeutic capabilities.

Purpose of the Study:

  • To review the history and development of PCCAs.
  • To explain the physical mechanisms behind acoustic droplet vaporization.
  • To summarize in vivo applications and future research directions for PCCAs.

Main Methods:

  • Review of existing literature on PCCAs.
  • Discussion of the physical principles of acoustic droplet vaporization.
  • Analysis of in vivo studies and proposed applications.

Main Results:

  • PCCAs undergo phase transition to gas upon ultrasound exposure, causing volumetric expansion.
  • Acoustic droplet vaporization enables micro/nanoscale in vivo applications.
  • Numerous studies have demonstrated in vivo efficacy of PCCAs.

Conclusions:

  • PCCAs offer significant advancements over traditional ultrasound contrast agents.
  • Further research is needed to optimize PCCA design and ultrasound parameters.
  • Characterization of potential bioeffects is crucial for human administration.