Lesion edge preserved direct average strain estimation for ultrasound elasticity imaging

Strain estimation by a Fourier Series-based extrema tracking algorithm for elastography

“…Under the assumption of a constant stress field, strain represents a relative stiffness or elasticity distribution 15 of the compressed tissue. Various strain estimation methods have been developed for elastography, most of which fall into two categories: gradient-based strain estimator [4,9,10] and direct strain estimator [11,12].…”

“…Estimators of this kind employ global or local adaptive scaling of the post-compressed signal to estimate strain directly from the stretching factor 50 [11,12]. The stretching factor maximizing the cross-correlation coefficient between the pre-and post-compressed signal segments can be used to calculate strain directly.…”