Evaluation of a Three-Hydrophone Method for 2-D Cavitation Localization

Area of Science:

• Acoustics
• Biomedical Engineering
• Medical Imaging

Background:

• Cavitation is crucial for ultrasound therapies like histotripsy and drug delivery.
• Precise cavitation localization is vital for treatment efficacy and patient safety.
• Current imaging methods for cavitation localization are expensive and complex.

Purpose of the Study:

• To develop a cost-effective and versatile method for localizing ultrasound cavitation sources.
• To validate the accuracy and feasibility of the proposed three-hydrophone localization technique.
• To enable real-time monitoring and improve safety in ultrasound-guided therapies.

Main Methods:

• Utilized a three-hydrophone array to measure time delays of cavitation signals.
• Employed intercorrelation analysis to determine signal arrival time differences.
• Calculated cavitation source position by minimizing a cost function or solving hyperbolic equations.

Main Results:

• The three-hydrophone method successfully localized cavitation sources.
• Experimental validation demonstrated tracking accuracy comparable to cavitation cloud size (2-4 mm).
• The system proved capable of tracking source displacement in real time.

Conclusions:

• The proposed three-hydrophone method offers a lightweight, versatile, and accurate approach to cavitation localization.
• This technique presents a cost-effective alternative to traditional imaging methods.
• The method shows promise for real-time monitoring in therapeutic ultrasound and straightforward extension to 3D localization.