Seip R, Vanbaren P, Ebbini E S
Dept. of Electr. Eng. and Comput. Sci., Michigan Univ., Ann Arbor, MI.
IEEE Trans Ultrason Ferroelectr Freq Control. 1994;41(5):706-13. doi: 10.1109/58.308507.
A prototype 16-element needle hydrophone array has been designed, fabricated and characterized. The primary use of this array is to provide acoustic feedback during ultrasound hyperthermia treatments. This feedback can be used to compensate for patient motion and tissue inhomogeneities by controlling the phased array driving patterns. It can also be used in adaptive dynamic focusing, a procedure which enables the phased array to focus at points away from specified control points. The hydrophone array consists of a PVDF sheet, which covers a silicon substrate carrier that contains the signal electrodes of the individual acoustic sensors. A complete description of the hydrophone array and its characteristics is given in this paper. The aberration correction and motion compensation algorithms are also described, and some experimental results are shown. Finally, a Taylor series based adaptive dynamic focusing method for phased arrays based on a set of discrete hydrophone array measurements is described. This algorithm does not require any prior knowledge of the applicator geometry and all the parameters needed for correction can be measured directly at the hydrophone array sensor locations.
一种16阵元针状水听器阵列已被设计、制造并进行了特性表征。该阵列的主要用途是在超声热疗过程中提供声学反馈。这种反馈可用于通过控制相控阵驱动模式来补偿患者运动和组织不均匀性。它还可用于自适应动态聚焦，这一过程能使相控阵在远离指定控制点的点上聚焦。水听器阵列由一块聚偏二氟乙烯（PVDF）薄片组成，该薄片覆盖在一个硅基载体上，硅基载体包含各个声学传感器的信号电极。本文给出了水听器阵列及其特性的完整描述。文中还描述了像差校正和运动补偿算法，并展示了一些实验结果。最后，描述了一种基于一组离散水听器阵列测量值的相控阵泰勒级数自适应动态聚焦方法。该算法不需要任何关于施源器几何形状的先验知识，校正所需的所有参数都可直接在水听器阵列传感器位置进行测量。
