A method of ultrasonic strain estimation under large tissue compression

Since the optical flow method can´t estimate the large displacement, the two-dimensional compression expansion method is proposed in this article to compensate for the large-scale movements in the image before the optical flow estimation. As a result, the related effects of decorrelation caused by the lateral displacement of the longitudinal compression can be effectively eliminated. Experimental results show that the two-dimensional compression extension methods can enhance the accuracy and robustness of the optical flow estimation. The resulting axial displacement and axial strain are basically consistent with the finite element simulation results, which proves the correctness of the new method.