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Focused beam control for ultrasound surgery with spherical-section phased array: sound field calculation and genetic
Mingzhu Lu1, Mingxi Wan, Feng Xu
1Department of Biomedical Engineering, School of Life Science and Technology, the Key Laboratory of Biomedical Information Engineering of Ministry of Education, Xi'an Jiaotong University, Xi'an, P.R. China.
Summary
This study introduces a novel method for precise ultrasound focus control using spherical-section phased arrays. The combined approach enhances accuracy and effectiveness in phased array ultrasound surgery.
Area of Science:
- Acoustics
- Biomedical Engineering
- Medical Physics
Background:
- Phased array ultrasound surgery requires precise control over acoustic fields for effective treatment.
- Accurate sound field calculation and focus pattern optimization are critical for therapeutic ultrasound applications.
Purpose of the Study:
- To develop an efficient sound field calculation method for spherical-section phased arrays.
- To create an optimization algorithm for precise focus pattern control in phased array ultrasound surgery.
Main Methods:
- Derivation of an explicit expression for sound field calculation using projection and binomial expansion.
- Construction of a genetic algorithm-based optimization for focus pattern control.
- Simulation and experimental validation using 256-element and 16-element phased arrays.
Main Results:
- Demonstrated accurate and effective focus control with the combined explicit expression and genetic optimization method.
- Achieved precise three-dimensional (3-D) focus steering for single, multiple, on-axial, and off-axial foci.
- Formed a single focus (1.25 mm x 1.25 mm x 7 mm) with high intensity (6080 W/cm2) and enlarged treatment volume up to 22 times with multiple foci.
Conclusions:
- The combined explicit expression and genetic optimization method is feasible and effective for phased array ultrasound surgery.
- The developed approach enables precise 3-D focus steering with excellent acoustic performance.
- Validated the applicability of the explicit expression approach compared to the point source method.