Two-dimensional spherical HIFU piezo

People try to optimize the probe's array design parameters (such as array elements, array elements, etc.), optimizing the acoustic matching components of the probe, array element shape, size, fill rate, optimize the sound field meter for probe design and calculation method, optimizing. The signal model of the probe, the selection of piezoelectric materials, and other technical challenges in the design of multiple probes to obtain better focusing effects. Therefore, a lot of research results have appeared one after another. In 2000, Jeffrey w Hand conducted a theoretical study on the influencing factors of the sound field characteristics of spherical phased arrays: including array elements, size, frequency by rectangle, ring, hexagon and random. In addition, in order to quantitatively analyze the sound field of HIFU piezo transducer, the sound field focusing effect is divided into several levels according to the intensity of the sound field. Through theoretical and experimental analysis, it is concluded that the array model obtained by random arrangement in the case where the ratio of the element of wavelength is 0.5-5mm has a good focusing effect. For the random arrangement, when the sparsity of the array elements is between 40% and 70%, a good focusing effect can also be obtained. Hynynen designed and optimized the use of transcranial treatment from the perspective of array elements and fill rate.PZT material HIFU piezo probe developed a matrix of 500 elements, operating between 700 and 800 kHz。The probe used in the vitro experiments to prove the feasibility of transcranial treatment of the probe. Hynynen design physical map of the transcranial HIFU probe.

Fink designed a high-intensity HIFU piezo vibration sensor for transcranial treatment. Its frequency is 0.8 MHz,The maximum sound intensity of the probe surface is Zow/c mZ, and the array element is a piezo ceramic disc. The probe can achieve a deflection range of ±10 mm in the radial direction.

In China, a high-intensity focused 4MHz ultrasonic piezo hifu hased array with densely arranged array elements is proposed, and the inverse focusing matrix synthesis algorithm is successfully used to calculate a better focusing effect, and the single point and multi-point focusing methods are realized. A probe array designed for the team led by Academician Chen Yazhu.

Throughout the research of P8 material piezo hifu treatment probes by domestic and foreign research teams, it is not difficult to find that the researchers have set up.Two-dimensional spherical crown array structure with different arrays was counted, and HIFU multi-array with different array element of size,shape,resonance frequency and structure characteristics were designed according to different clinical requirements.However, when is designing the two-dimensional spherical crown array structure, there are still great obstacles. Because the two-dimensional spherical crown array structure is relatively complex, there is no complete of array design principles for the two-dimensional spherical crown array structure design.