A nonlinear lumped model for ultrasound systems using CMUT arrays.
A nonlinear lumped model for ultrasound systems using CMUT arrays.
复制标题
使用CMUT阵列的超声系统的非线性集总模型。
DOI：
10.1109/tuffc.2015.007145
复制
发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Degertekin FL
中科院分区：
文献类型：
--
作者：
Satir S;Degertekin FL
我们提出了一个非线性集总模型，预测的电输入输出行为的超声系统使用CMUT与任意阵列/膜/电极几何形状在不同的发射-接收配置和驱动信号。仅接收操作，其中响应于入射压力场的CMUT阵列的电输出信号的计算，包括通过修改基于边界元的刚性挡板中的CMUT阵列的振声公式。沿着精确的大信号发射模型，当发射和接收信号可以在时间上分离时，该公式涵盖了一发一收和脉冲回波操作。在这种分离无效的情况下，例如在连续波发射-接收模式、具有附近的硬壁或软壁的脉冲-回波模式或在诸如微流体通道中的有界空间中使用的CMUT，使用基于图像方法的有效制剂。这些特定的应用程序和整体建模方法已通过比较与有限元分析的具体例子，包括CMUT与多个电极。为了进一步证明该模型的成像应用的能力，部分双环血管内超声阵列的双向响应的模拟使用并行计算集群，其中单个阵列元件的输出电流计算给定的输入脉冲，并与实验结果进行比较。由于其通用性，所提出的模型可以是一个有用的工具，用于快速迭代CMUT为基础的系统设计和仿真的广泛的超声应用。
We present a nonlinear lumped model that predicts the electrical input-output behavior of an ultrasonic system using CMUTs with arbitrary array/membrane/electrode geometry in different transmit-receive configurations and drive signals. The receive-only operation, where the electrical output signal of the CMUT array in response to incident pressure field is calculated, is included by modifying the boundary element based vibroacoustic formulation for a CMUT array in rigid baffle. Along with the accurate large signal transmit model, this formulation covers pitch-catch and pulse-echo operation when transmit and receive signals can be separated in time. In cases when this separation is not valid, such as CMUTs used in continuous wave transmit-receive mode, pulse-echo mode with a nearby hard or soft wall or in a bounded space such as in a microfluidic channel, an efficient formulation based on the method of images is used. Some of these particular applications and the overall modeling approach have been validated through comparison with finite element analysis on specific examples including CMUTs with multiple electrodes. To further demonstrate the capability of the model for imaging applications, the two-way response of a partial dual-ring intravascular ultrasound array is simulated using a parallel computing cluster, where the output currents of individual array elements are calculated for given input pulse and compared with experimental results. With its versatility, the presented model can be a useful tool for rapid iterative CMUT-based system design and simulation for a broad range of ultrasonic applications.