Joint characterization method for focus peak sound pressure of high-intensity focused ultrasound transducer

Abstract

The invention relates to a joint characterization method for a focus peak sound pressure of a high-intensity focused ultrasound transducer The method comprises the following steps: firstly, measuring sound field distribution of a focused ultrasonic transducer by using a hydrophone under low-intensity excitation; secondly, carrying out numerical calculation according to the nominal geometric dimension of the focused ultrasonic transducer; finely adjusting the geometric dimension of the focused ultrasonic transducer in numerical calculation, so that measurement results in calculation results are matched; obtianing the change rule of the relative phase quantity of the nonlinear higher harmonic through analysis; then, under high-intensity excitation, adopting the hydrophone to measure and obtain a signal of a focus; according to the amplitude-frequency response of the hydrophone, calculating and obtaining a nonlinear harmonic sound pressure amplitude; and finally calculating the peak sound pressure of the focus. According to the method, the nonlinear harmonic relative phase quantity of the high-intensity focused ultrasound focus is obtained through numerical calculation, and the peak sound pressure of the high-intensity focused ultrasound focus is obtained by combining the nonlinear harmonic sound pressure amplitude accurately measured by the hydrophone.

Description

technical field [0001] The invention relates to a peak sound pressure characterization method, in particular to a joint characterization method of the focal peak sound pressure of a high-intensity focused ultrasonic transducer. Background technique [0002] High Intensity Focused Ultrasound (HIFU) is a new non-invasive treatment technology for the treatment of solid benign / malignant tumors. The focused transducer is used to focus the sound energy to the target area. The sound intensity of the target area can be controlled up to 10 3 W / cm 2 , can cause coagulation necrosis of the focal tissue in a short time (seconds), while the surrounding normal tissue is not damaged. [0003] The accuracy of HIFU treatment is very high. It is necessary to completely destroy all tumor tissues in the target area without overtreatment and damage to surrounding normal tissues. When high-intensity focused ultrasound propagates in human tissue, the waveform will be nonlinearly distorted and h...

AI Technical Summary

Problems solved by technology

Hydrophones currently used to measure high-intensity focused ultrasound can obtain the amplitude-frequency response of the hydrophone through calibration, but the phase-frequency response of the hydrophone cannot be obtained yet

Although the phase-frequency response of the hydrophone will not affect the energy distribution of the received nonlinear ultrasonic signal, it will cause changes in the positive peak sound pressure and negative peak sound pressure of the nonlinear ultrasonic signal

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