Estimation and compensation of ultrasonic wavefront distortion using a blind system identification method.

Estimation and compensation of ultrasonic wavefront distortion using a blind system identification method.
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使用盲系统识别方法估计和补偿超声波波前畸变。

DOI:
10.1109/tuffc.2002.1009332
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发表时间:
2002
期刊:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control
影响因子:
--
通讯作者:
Waag,RobertC
Waag,RobertC
中科院分区:
--
文献类型:
--
作者:
Lin,Feng;Waag,RobertC

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提出了一种用于超声b扫描成像中波前像差估计和校正的通用随机输入滤波器模型。在该模型中,焦点和换能器元件之间的像差由线性滤波器组对公共随机信号的响应表示。银行中的每个滤波器的响应被发现使用现有的子空间盲系统识别方法的两级扩展。接收波形使用逆滤波器进行补偿,发射波形使用时间反转进行预失真。为了测试该模型,使用二维阵列系统进行实验,以获得来自点反射器和来自随机介质的回波,在每种情况下通过畸变器。畸变器是模拟人体腹壁产生的波前畸变的体模,随机介质是模拟人体肝脏的超声特性。实验结果表明,该方法可以同时改善发射和接收聚焦,并且性能优于时移估计和补偿以及后向传播时移估计和补偿方法。
A common random input filter model is described for estimation and correction of wavefront aberration in ultrasonic b-scan imaging. In the model, aberration between the focus and the transducer elements is represented by the response of a linear filter bank to a common random signal. The response of each filter in the bank is found using a two-level extension of an existing subspace method for blind system identification. The receive waveforms are compensated using an inverse filter, and the transmit waveforms are predistorted using time reversal. To test the model, experiments were conducted using a two-dimensional array system to obtain echoes from a point reflector and from a random medium in each case through an aberrator. The aberrator is a phantom that mimics wavefront distortion produced by human abdominal wall, and the random medium is made to mimic ultrasonic characteristics of human liver. The results indicate the method can improve both the transmit and the receive focus and can outperform time-shift estimation and compensation as well as the method of backpropagation followed by time-shift estimation and compensation.
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