Methods for Rapid Characterization of Tunable Microbubble Formulations.

Area of Science:

• Biomedical Engineering
• Materials Science
• Acoustics

Background:

• Optimizing microbubble formulations for clinical applications requires rapid measurement of size distribution, concentration, and acoustic intensity.
• Iterative design of microbubbles necessitates efficient characterization methods.

Purpose of the Study:

• To develop and validate a comprehensive method for comparing microbubble formulations with varying lipid shell compositions.
• To enable rapid assessment of microbubble properties for improved formulation design.

Main Methods:

• Utilized optical (ImageJ macro for counting and sizing) and acoustic (agarose phantom for echogenicity) measurement techniques.
• Modified open-source ImageJ macro for selective counting and sizing of brightfield microbubble images.
• Designed a high-throughput agarose phantom to collect multiple scattering reflections for estimating echogenicity.

Main Results:

• Successfully collected data on size distribution, concentration, and mean scattering intensity for different microbubble formulations.
• Demonstrated the ability to estimate echogenicity using a novel high-throughput phantom.
• The combined analysis of size, concentration, and scattering power identified necessary modifications for microbubble prototyping.

Conclusions:

• The developed method provides a comprehensive approach to characterize microbubble formulations.
• Rapid optical and acoustic measurements facilitate efficient iteration in microbubble design for clinical applications.
• This technique aids in identifying specific modifications needed for prototyping targeted microbubble formulations.