结合维纳滤波的相干波束合成超声成像研究

传统超声动态聚焦通过简单的延时叠加方法成像，分辨率较低、对比度较差。本研究在基于像素的相干波束合成（Coherent PB）的基础上，应用一种计算效率较高的前置维纳滤波器，利用焦点处的脉冲回波对整个阵列信号进行相位矫正，并通过后置维纳滤波器为每次子孔径波束合成结果施加自适应权值，进一步抑制噪声和伪影。通过仿真、仿体和在体实验对本方法的有效性进行验证，与Coherent PB相比，本方法在保持较高横向分辨率和计算效率的基础上，明显改善图像的轴向分辨率和对比度，具有一定临床应用价值。 

Coherent Beam-forming Combined with Wiener Filter in Ultrasound Imaging

The traditional ultrasonic dynamic focusing imaging which simply uses the delay-and-sum method in beamforming shows low resolution and poor contrast. In this study, based on the coherent pixel-based beamforming (Coherent PB), a novel Wiener pre-filter with high computational efficiency is applied to correct the phase of the entire array signal by using the pulse-echo at the focal point. We also apply a Wiener post-filter calculating adaptive weights for the beamforming results of each sub-aperture to suppress the noise and artifacts. The proposed method's effectiveness is verified through simulation experiments, phantom experiments, and in vivo experiments. Compared with Coherent PB, the proposed method significantly improves the axial resolution and contrast of images while maintaining the high lateral resolution and computational efficiency, which shows certain clinical application value.