Document Type : Original Paper
School of Information Science and Engineering, Changsha Normal University, Changsha 410100, China
School of Physics and Electronics, Central South University, Changsha 410083, China
School of Information Science and Engineering, Changsha Normal University
Introduction: The large aperture concave spherical focused ultrasonic transducer has stronger acoustic focusing effect and can obtain good temperature rise effect. The purpose of this study was to explore the effect of different frequency, duty cycle and inner radius parameters on temperature rise of multi-layer biological tissue.
Material and Methods: The simulation model of high-intensity focused ultrasound (HIFU) irradiated multi-layer biological tissue was constructed. By changing the irradiation frequency, duty cycle and inner radius of large aperture concave spherical focused ultrasonic transducer, the sound field and temperature field of multi-layer biological tissue were simulated and calculated by using Westervelt nonlinear acoustic wave equation and Pennes biological heat conduction equation, respectively.
Results: The intensity of sound field increased with the increase of frequency, while it decreased with the increase of inner radius, but the duty cycle almost had no effect on the intensity of sound field. The focal temperature increased with the increase of frequency and duty cycle, but decreased with the increase of inner radius.
Conclusion: By selecting appropriate parameters of transducer, the optimum temperature rise in the target area of biological tissue can be obtained by using a large aperture concave spherical focused ultrasonic transducer.