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Updated: Aug 14, 2026

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
Published on: January 24, 2016
Theoretical bounds on the estimation of transverse displacement, transverse strain and Poisson's ratio in
E E Konofagou1, T Varghese, J Ophir
1Department of Radiology, University of Texas Medical School, Houston 77030, USA. elisak@bwh.harvard.edu
Abstract:
The Cramér-Rao Lower Bounds (CRLB) are derived for the displacement and strain estimation in directions orthogonal to the ultrasonic beam axis, using a previously-described recorrelation method of axial, lateral and elevational motion estimation. We also compare it to the lateral tracking method that involves the sole use of the axial signal in the transverse direction. Our theoretical results, verified with simulations and phantom experiments, show that elastography is capable of measuring axial and transverse strain at up to 10% axially applied compression. Finally, we predict the performance of the estimation of the Poisson's ratio using decoupled axial and lateral estimates that result from the recorrelation method.
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