Freeman S, Li P C, O'Donnell M
Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor 48109, USA.
Ultrason Imaging. 1995 Jul;17(3):173-96. doi: 10.1177/016173469501700301.
Dynamically-focused on receive, real-time array systems exhibit image degradation far from the focal zone of the fixed transmit lens. A retrospective filtering technique reducing the effects of the fixed transmitter is presented. The filter deconvolves the defocused transmit pattern producing a new in-focus transmit/receive image, where the filter coefficients are derived with a least-squares method. Experimental results are presented for a 128 channel array system showing the method's performance. A proposed architecture for real-time filtering is also discussed.
动态聚焦于接收，实时阵列系统在远离固定发射透镜焦区的地方会出现图像退化。本文提出了一种减少固定发射器影响的回顾性滤波技术。该滤波器对散焦的发射模式进行反卷积，生成新的聚焦发射/接收图像，其中滤波器系数通过最小二乘法得出。给出了一个128通道阵列系统的实验结果，展示了该方法的性能。还讨论了一种用于实时滤波的建议架构。
