基于广义相干系数的超声平面波复合成像

Ultrasound plane-wave compounding based on the generalized coherence factor

传统的平面波复合成像仅仅将不同偏转角度下的平面波回波数据进行简单平均获得图像,得到的图像质量较差。本文提出了多角度平面波成像下的广义相干系数(GCF)来提高复合成像质量的方法。通过二维傅里叶变换求取多角度观测下的广义相干系数来进行成像。首先使用Field II的仿真数据对比了不同频率成分选择的成像效果;然后通过仿体数据验证提出的方法的有效性;最后验证了声速误差下算法的鲁棒性。实验结果表明,提出的方法能够明显改善多角度平面波复合成像的效果,并且有较好的鲁棒性。

Traditional plane wave compounding simply averages the echo data of different steered plane waves to get the image output. Its imaging quality is not good. In this paper, a method based on the Generalized Coherence Factor(GCF) of multi-angle plane wave compounding is proposed to improve the compounding quality. By using the 2-dimensional fast Fourier transform, the GCF can be calculated for the imaging algorithm. The Field II simulation is firstly used to get different results under different frequency components and determine an appropriate component selecting criteria. Then the proposed method is validated by using a group of phantom data. Finally, the robustness of the algorithm is investigated under different sound velocity errors. Results show that the proposed method can substantially improve the quality of plane-wave compounding and has a good robustness.