high temperature HIFU ultrasound piezo

With the development of science and technology, the non-destructive testing technology of temperature field has made great progress, and some non-destructive side temperature methods of HIFU piezo ceramic have been proposed.Such as electrical impedance tomography, magnetic resonance (M IR) ultrasound, Huibo and thermal compensation. The magnetic resonance imaging (MIR) method provides better contrast between the target tissue and the surrounding tissue. Due to temperature dependence of parameters such as time (lT) and diffusion coefficient (D), MIR can monitor target tissue. The temperature changes, but it is expensive. Recently, studies have shown that elastography can be applied to the non-destructive side temperature in ultrasonic high focusing piezo technology. The elasticity of the tissue damaged by HIFU is smaller than that of the surrounding normal tissue, and the elastic image is the elastic modulus of the tissue. The changes are more sensitive. However, these techniques are not yet mature and have not been clinically applied in these methods. Ultrasonic temperature measurement is considered to be the most promising technology.

l) 250Khz hifu piezo ceramics is less harmful to the human body, can monitor the temperature changes of deep tissues for a long time, and the price is low, equipment

2 Ultrasound has obvious differences in tissue characteristics, and can effectively extract tissue temperature information.

Ultrasonic energy can provide real-time target tissue t image compatibility is better. Over the years, some ultrasonic non-destructive temperature measurement schemes have been proposed, including reflection ultrasound HIFU piezo transducer.

Ultrasound transmission; finite element method; ultrasonic image analysis, Among them, the research on the reflection ultrasonic method is the most, which is related to the easy in vivo clinical trial in the reflection method, and includes the method based on echo frequency shift, echo time shifting back wave energy, echo time-frequency map segmentation, etc. It has been reported in the literature that the echo time shift method can obtain higher temperature resolution HIFU ultrasound piezo.

Almost all methods must pre-measure the acoustic characteristics of various tissues and their temperature characteristics, and these parameters usually vary from tissue to tissue, which brings difficulties in ultrasonic non-destructive temperature measurement technology. This is an urgent need to solve the problem of high intensity focused ultrasound, its difficulty and work t are very big. At present, we are cooperating with relevant universities to conduct non-destructive temperature measurement technology based on time-shifted high-intensity focused ultrasound. It is hoped that the temperature rise effect of tumor surface and surrounding tissues will be detected non-destructively in real time as soon as possible, and the clinical promotion and application of hifu technology will be promoted.