Method for measuring high-intensity focused ultrasound field based on infrared temperature measurement

Abstract

The invention relates to a method for measuring a high-intensity focused ultrasound sound (HIFU) field based on infrared temperature measurement. The method comprises the following steps of: 1, measuring the sound intensity value of a focused ultrasound sound source by using a hydrophone; 2, placing an ultrasound absorber, measuring the sound intensity value by using the hydrophone again, and comparing the sound intensity value obtained in the step 2 and the sound intensity value obtained in the step 1 to obtain an attenuation physical quantity value; 3, measuring the temperature rise which is formed on the surface of the ultrasound absorber which is irritated at the focused ultrasound sound source for set time by using an infrared thermodetector, and calculating the maximum temperate rise rate of the surface temperature rise to obtain the sound and heat parameter comprehensive characteristic value of the ultrasound absorber; and 4, measuring the temperature rise of the surface of the ultrasound absorber at different positions by using the infrared thermodetector and solving the corresponding maximum temperature rise rate, and operating the maximum temperature rise rate, the attenuation physical quantity value and the sound and heat parameter comprehensive characteristic value to obtain sound intensity distribution at the different corresponding positions. Compared with the prior art, the method has the advantage of realizing quick three-dimensional measurement of the HIFU sound field.

Description

technical field [0001] The invention relates to a method for measuring a high-intensity focused ultrasonic sound field, in particular to a method for measuring a high-intensity focused ultrasonic sound field based on infrared temperature measurement. Background technique [0002] The three-dimensional sound field distribution of high-intensity focused ultrasound is a key factor to measure the design and manufacturing process of HIFU treatment probes, as well as the treatment effect. Therefore, the measurement of high-intensity focused ultrasound sound field is an important link in the field of HIFU research. [0003] Since the 1990s, the International Electrotechnical Society (IEC) has formulated a large number of standards in the measurement of ultrasonic sound field parameters, but the focused ultrasonic sound field has the following characteristics: [0004] The focal volume is usually small (in the shape of rice grains, with a cross-sectional diameter of about 1-3 mm an...

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Problems solved by technology

[0011] 1. The process of obtaining the three-dimensional eigenvalues ​​of the focused sound field is very time-consuming;

[0012] 2. The sound intensity energy in the focal area is too large, which may easily cause damage to the hydrophone;

[0013] 3. If the vibration phase of each point on the radiation surface of the transducer is not completely consistent, the sound intensity at the focal point is not necessarily proportional to the square of the sound pressure;

[0014] 4. When the HIFU equipment is output at full power, the ultrasound will produce nonlinear and diffraction effects when propagating in water or tissue, and the nonlinear accumulation is different in water and tissue, so the sound field distribution measured in water cannot directly reflect situation in the organization

[0015] 5. Since the finite amplitude wave will produce waveform distortion during the propagation process, causing nonlinear phenomena such as harmonics, sound attenuation, and sound saturation, the results obtained by inferring the HIFU sound field through extrapolation are not ideal

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