位移场修正法抑制弹性成像幅度调制噪声  

Suppressing Amplitude Modulation Noise by Using Displacement Field Correction based on Displacement Location Estimation

作　　者：崔少国[1] 彭彩碧[2] 杨宏雨[1] 

机构地区：[1]重庆理工大学计算机科学与工程学院,重庆巴南区400054 [2]重庆市第三人民医院,重庆渝中区400014

出　　处：《电子科技大学学报》2014年第2期306-310,共5页Journal of University of Electronic Science and Technology of China

基　　金：重庆市科委自然科学基金(cstc2012jjA40030);重庆市教委科学技术研究项目(KJ130826);国家自然科学基金(61202348)

摘　　要：结合位移位置估计提出位移场修正方法来抑制弹性成像幅度调制噪声。先用位移位置估计算法估计出位移位置,然后利用位置值使用线性插值法将位移修正到估计窗中心点,再使用梯度操作进行应变估计产生最终的弹性图像。基于位置估计的位移场修正法产生的弹性图像信噪比有显著的提高,在不同窗长和应变成像情况下,均优于幅度log压缩算法和幅度调制修正AMC算法。该方法更能有效地抑制弹性成像幅度调制噪声。Elastography based on pre-and post-compression signal window matching will generate amplitude modulation （AM） noise because of signal amplitude random fluctuation. On the basis of displacement location estimation, this paper proposes a displacement field correction （DFC） method to suppress AM noise. Firstly, the displacement locations are estimated by using the displacement location estimation algorithm. Then the displacement estimates are corrected by using the linear interpolation on the basis of displacement location estimates. Finally, the strains are estimated by using gradient operation and mapped into a grayscale image. Elastogram using the displacement field correction method has less AM noise significantly. The proposed method has the highest performance than signal amplitude log-compression （ALC） and amplitude modulation correction （AMC） at various strains or window-lengths. The DFC based on displacement location estimation can efficiently suppress AM noise.

关 键 词：幅度调制噪声 位移场修正 位移位置估计 弹性成像 超声 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]