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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Building three-dimensional images using a time-reversal chaotic cavity
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Building three-dimensional images using a time-reversal chaotic cavity

机译：使用时间反转混沌腔构建三维图像

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摘要

The design of two-dimensional (2-D) arrays for three-dimensional (3-D) ultrasonic imaging is a major challenge in medical and nondestructive applications. Thousands of transducers are typically needed for focusing and steering in a 3-D volume. In this article, we propose a different concept allowing us to obtain electronic 3-D focusing with a small number of transducers. The basic idea is to couple a small number of transducers to a chaotic reverberating cavity with one face in contact with the body of the patient. The reverberations of the ultrasonic waves inside the cavity create at each reflection virtual transducers. The cavity acts as an ultrasonic kaleidoscope multiplying the small number of transducers and creating a much larger virtual transducer array. By exploiting time-reversal processing, it is possible to use collectively all the virtual transducers to focus a pulse everywhere in a 3-D volume. The reception process is based on a nonlinear pulse-inversion technique in order to ensure a good contrast. The feasibility of this concept for the building of 3-D images was demonstrated using a prototype relying only 31 emission transducers and a single reception transducer.
机译：用于三维（3-D）超声成像的二维（2-D）阵列的设计是医学和非破坏性应用中的主要挑战。通常需要成千上万个换能器才能对3D体积进行聚焦和操纵。在本文中，我们提出了一个不同的概念，使我们能够使用少量换能器获得电子3-D聚焦。基本思想是将少量换能器连接到一个混沌混响腔，其一面与患者的身体接触。腔内超声波的混响在每个反射虚拟换能器处产生。腔体充当超声波万花筒，使少量的换能器倍增，并创建了更大的虚拟换能器阵列。通过利用时间反转处理，可以共同使用所有虚拟换能器将脉冲聚焦在3D体积中的任何地方。接收过程基于非线性脉冲反转技术，以确保良好的对比度。使用仅依赖31个发射换能器和单个接收换能器的原型，证明了此概念用于构建3D图像的可行性。

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