Sound field simulation platform for HIFU piezo ceramic

A new type two-dimensional spherical crown array is designed. Based on the self-built sound field platform, the sound field characteristics of the model are studied. Finally, the structure characteristic parameters F-number, arrangement and other structures of the array are found. The characteristics are obviously related to the sound field of the piezo ceramic spheres phased array. This exploratory work provides an important guiding role in probe design work. In addition, we have built a platform for the development of a multi-element probe structure from geometric modeling to model . By completing work, a two-dimensional spherical crown array was finally established.The development platform provides a good basic research and development platform for the re-development of the 2D spherical crown array.

 This thesis also designs and manufactures a multi-spherical phased array structure with 125 array elements, a resonant frequency of 2MHz, and a regular hexagonal Pzt4 ceramic with a side length of 2.5mm. And the structure of the array is sounded, and the litigation analysis is straightforward. The excitation signal is quite awkward. In the case of a 2MHz continuous sinusoidal signal, the maximum intensity is less than O.3 Pmax. In the case, the single-point focus deflection range of the xoy focal plane can reach 6 mm, and the deflection range of the sound field along the Z-axis can reach 6 mm; under the same signal condition, the single-point physical focus has a long axis of 7.5 mm. Finally, the HIFU piezo ceramic was tested for performance. Experimental data found that the probe is in the focal plane of the physical focus point,The deflection distance along the x-axis and the y-axis is within 8.5 mm when the maximum grating lobes are less than half the intensity of the strongest grating in the focal plane. In the case of single-point physical focusing, the excitation signal is a pulse signal with a frequency of 2.1 MHz , and its focal length is 3 mm. In addition, we found that when the probe operates at a frequency between 1.5 and 2.5 MHz, the sound field has a physical focus effect. Comparing the results of theoretical analysis with the experimental analysis results, it can be found that the sound field simulation platform of 2MHZ HIFU piezo ceramics array has certain predictive ability for the sound field characteristics .

At present, in the design of multi-spherical crown HIFU probes, the commonly used array elements are circular and rectangular.there are few regular hexagonal elements. This paper proposes a new type of spherical crown array arrangement.A corresponding transducer model was made. Currently, in the research team at home and abroad, it is generally designed.The arrays are mostly arranged in a quasi-random manner. It utilizes a fast probe process technology and 3D printing technology to realize the process manufacturing of the probe, which shortens the multi-spherical crown high intensity focused ultrasound with complex array structure without affecting the performance of the probe.

Established a two-dimensional array of high-intensity focused ultrasound probe development platform,structure design platform, sound field theory analysis platform, probe  structure design platform, probe process production platform.The platform provides strong support for the re-development of the second-dimensional multi-array spherical HIFU treatment probe.The advantage of this platform is that it reduces the manufacturing cost of the probe and shortens the development cycle of the probe. Systematic Introduce the development platform of our own two-dimensional multi-sphere coronal hifu array, and created a 125 channel.Hifu beauty treatment probe designs to manufacturing and performance testing . There are still many aspects that need to be constantly improved and supplemented. Here are some of the main research work in the future.