Passive cavitation mapping for localization and tracking of bubble dynamics.

Area of Science:

• Physics
• Acoustics
• Biomedical Engineering

Background:

• Current methods for studying cavitation dynamics are limited to single bubbles or transparent media.
• Multi-bubble cavitation frequently occurs in opaque substances like biological tissues, posing a challenge for observation.
• Existing techniques lack the capability to analyze complex cavitation in non-transparent environments.

Purpose of the Study:

• To develop and validate a novel method for observing multi-bubble cavitation dynamics in opaque media.
• To overcome the limitations of existing acoustic and optical cavitation analysis techniques.
• To provide a high spatiotemporal resolution technique applicable to real-world scenarios, including biological tissues.

Main Methods:

• Utilized passive signals from a 64-channel diagnostic ultrasound array.
• Employed advanced signal processing to localize and separate emissions from multiple cavitating bubble clusters.
• Applied the method to cavitation dynamics within agar gel, an opaque medium.

Main Results:

• Successfully localized and separated emissions from several bubble clusters in opaque agar gel.
• Demonstrated high spatiotemporal resolution in observing cavitation dynamics.
• Validated the applicability of the developed method for opaque media.

Conclusions:

• The developed ultrasound-based method enables the observation of multi-bubble cavitation dynamics in opaque media.
• This technique offers a significant advancement over existing methods, particularly for applications involving biological tissues.
• The high resolution and applicability to opaque environments open new avenues for cavitation research.