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Title:: Coherent plane-wave compounding weighted by average short-lag coherence factor

Author(s):: WANG Hao; XU Xiang; HE Qing; ZHENG Chichao; PENG Hu; Department of Biomedical Engineering,Hefei University of Technology,Hefei 230009,China

Keywords:: Ultrasound imaging; Coherent plane-wave compounding; Average short-lag coherence factor; Coherence factor; Simulation; Resolution

摘要:: 相干平面波复合成像(coherent plane-wave compounding, CPWC)可以实现高帧率、高质量成像，但未考虑平面波成像结果间的相干性。相干系数（coherence factor, CF）加权CPWC算法可以提高成像的分辨率和对比度，但降低了背景组织成像质量。短阶相干系数（short-lag coherence factor, SLCF）加权算法，可以进一步改善对比度和背景成像质量，但未考虑到较大发射角度平面波成像结果的相干性，导致分辨率降低。我们研究的平均短阶相干系数（average short-lag coherence factor,ASLCF）先计算出不同范围的发射角度的成像结果对应的SLCF，然后进行均值处理，最后作为加权系数对CPWC进行加权成像。实验和仿真证明在保持其他性能基本不变的情况下，相对于SLCF，ASLCF加权算法可以明显提高分辨率和背景组织的成像质量。

Abstract:: The coherent plane-wave compounding (CPWC) can achieve high-quality images with high frame rate，but not consider the coherence between the plane-wave imaging results. Coherence factor (CF) weighted algorithm can effectively improve the imaging contrast and resolution, while it degrades the background speckle quality. Short-lag coherence factor (SLCF) can achieve higher contrast radio and better background speckle quality. However it has lower resolution,because not consider the coherence of the plane imaging results with large transmitting angles. The average short-lag coherence factor(ASLCF) was researched in this paper, and ASLCF was the average value of SLCFs with different range of steering angles, then it was used to weight CPWC. Simulated and experimental results show that in comparison with SLCF weighted algorithm, ASLCF-weighted algorithm can improve the background imaging quality and lateral resolution ,while maintain other performance parameter.