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Related Experiment Video

Updated: Mar 12, 2026

Introduction to the Ultrasound Targeted Microbubble Destruction Technique
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Inhalable Ultrasound Contrast Agent with Induced Microbubble Destruction and Associated Biological Effects on the

Andrew S Weitz1, Patrick R Sears2, Phillip W Clapp3

  • 1Lampe Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Chapel Hill, NC, USA.

Ultrasound in Medicine & Biology
|March 10, 2026
PubMed
Summary

Intentional destruction of ultrasound microbubbles (MBs) for pulmonary imaging is safe for respiratory epithelial cells. This study found no cell death or ciliary dysfunction after MB destruction, supporting inhaled contrast agent development.

Keywords:
BioeffectsContrast agentMicrobubbleRespiratory epithelium

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Area of Science:

  • Pulmonary imaging
  • Biomedical engineering
  • Cellular biology

Background:

  • Ultrasound microbubble (MB) contrast agents are used in imaging.
  • Intentional MB destruction via cavitation is established but its safety for pulmonary applications is unknown.
  • Human bronchial epithelial (hBE) cells are the target for inhalable contrast agents.

Purpose of the Study:

  • To evaluate the safety of intentional microbubble destruction in hBE cells.
  • To assess the impact of MB contrast agents and their destruction on respiratory cell viability.
  • To determine the feasibility of inhaled MB contrast agents for pulmonary imaging.

Main Methods:

  • In vitro evaluation of hBE cell cultures exposed to a mucus-targeting, cationic MB contrast agent.
  • Four experimental conditions: no MBs, low mechanical index (MI) MBs, high MI MB destruction, and Triton-X control.
  • Cell viability assessed by quantifying ciliated area and ciliary beat frequency pre- and post-exposure.

Main Results:

  • Contrast signal was visible with MBs; signal loss occurred after MB destruction pulse.
  • No significant changes in percent ciliated area or ciliary beat frequency were observed across imaging conditions.
  • Triton-X exposure resulted in complete loss of ciliated area, confirming assay validity.

Conclusions:

  • High MI-induced MB destruction does not cause cellular death in the respiratory epithelium.
  • These findings support the development of inhaled MB contrast agents for pulmonary imaging.
  • The safety of MB contrast agents for pulmonary applications is demonstrated in vitro.