Wide focal domain phased array focusing ultrasonic transducer

Abstract

The present invention relates to a focused ultrasonic transducer with a large focal area phased array, which is composed of a large-aperture rigid spherical crown and several planar ultrasonic transducer array elements, and all the array elements are discretely distributed at the center of the spherical crown. On several layers of concentric rings at the origin, the angular spacing between the ring layers is equal, the initial array element position of each layer of concentric rings is randomly determined, and the rest of the array elements are evenly distributed on the concentric rings at equal angular intervals. Each array element has an independent electric excitation signal feeder, respectively connected to the phase control signal excitation system. The frequency of the excitation signal of each array element is the same, and the phase and voltage amplitude are different. By adjusting the excitation phase and amplitude of each array element to realize electronic focusing and scanning, it can generate multiple modes of multi-focus sound field distribution, and then form the desired shape and The size of the focal area, and provide the ultrasonic energy required to heat the target tissue, to ensure that the target tissue has a uniform thermal dose distribution, to achieve directional conformal heating of deep tumor lesions in the human body.

Description

technical field [0001] The invention relates to an ultrasonic transducer, in particular to a large focal region phased array focused ultrasonic transducer, which is applied to a large focal region phased focused ultrasonic system for heating deep tumor lesions, and belongs to the technical field of biomedical engineering. Background technique [0002] The large focal area phased array focused ultrasound transducer is one of the key components of the large focal area phased focused ultrasound system for heating deep tumor lesions. It can not only penetrate the ultrasonic energy with low radiation power into human tissue through external emission, and gather it in the set focal area to form a high sound intensity area, but also can control the excitation phase and amplitude of each array element in it. , to generate multi-mode multi-focus sound field distribution, and then form the desired shape (circle, ring and other regular shapes and arbitrary irregular shapes) and the siz...

AI Technical Summary

Problems solved by technology

"This technology has obvious shortcomings: the phased array transducer can only form a limited "focus area", which is not conformal, and the focus area is limited. For tumor tissues with a certain shape and size, it must be sequentially Focus and radiation can completely cover the entire lesion tissue

Therefore, it is not suitable for directed conformal heating of larger lesions

Images