Experimental corroboration of the nonstationary strain estimation errors in elastography

T Varghese, J Ophir - Ultrasound in medicine & biology, 2001 - Elsevier
The nonstationary variation in the noise performance of the cross-correlation-based strain
estimator due to frequency-dependent attenuation and lateral and elevational signal …

Estimation of displacement vectors and strain tensors in elastography using angular insonifications

U Techavipoo, Q Chen, T Varghese… - IEEE transactions on …, 2004 - ieeexplore.ieee.org
In current practice, only one out of three components of the tissue displacement vector and
one of nine components of the strain tensor are accurately estimated and imaged in …

Hybrid algorithm for elastography to visualize both solid and fluid-filled lesions

A Nahiyan, MK Hasan - Ultrasound in medicine & biology, 2015 - Elsevier
We propose a novel strain estimation technique that can produce reliable strain images of
both solid and fluid-filled lesions. In our method, a kernel-based correlation coefficient …

Robust estimation of displacement in real-time freehand ultrasound strain imaging

S Rezajoo, AR Sharafat - IEEE transactions on medical …, 2018 - ieeexplore.ieee.org
We present a novel and efficient approach for robust estimation of displacement in real-time
strain imaging for freehand ultrasound elastography by utilizing pre-and post-deformation …

Estimating the elastographic signal-to-noise ratio using correlation coefficients

S Srinivasan, F Kallel, J Ophir - Ultrasound in medicine & biology, 2002 - Elsevier
In conventional elastography, strain is estimated from the gradient of the displacement (time-
delay) estimates. The displacement estimates involve estimating the peak location of the …

Comparative evaluation of strain-based and model-based modulus elastography

MM Doyley, S Srinivasan, SA Pendergrass… - Ultrasound in medicine …, 2005 - Elsevier
Elastography based on strain imaging currently endures mechanical artefacts and limited
contrast transfer efficiency. Solving the inverse elasticity problem (IEP) should obviate these …

An efficient block matching and spectral shift estimation algorithm with applications to ultrasound elastography

A DiBattista, JA Noble - IEEE transactions on ultrasonics …, 2014 - ieeexplore.ieee.org
An efficient block matching and spectral shift estimation algorithm for freehand quasi-static
ultrasound elastography is described in this paper. The proposed method provides a …

Frequency-domain-based strain estimation and high-frame-rate imaging for quasi-static elastography

A Ramalli, O Basset, C Cachard… - IEEE transactions on …, 2012 - ieeexplore.ieee.org
In freehand elastography, quasi-static tissue compression is applied through the ultrasound
probe, and the corresponding axial strain is estimated by calculating the time shift between …

Characterization of elastographic noise using the envelope of echo signals

T Varghese, J Ophir - Ultrasound in medicine & biology, 1998 - Elsevier
A theoretical formulation characterizing the noise performance of strain estimation using
envelope signals is presented for the cross-correlation based strain estimator in …

Automatic frame selection using MLP neural network in ultrasound elastography

A Zayed, H Rivaz - Image Analysis and Recognition: 16th International …, 2019 - Springer
Ultrasound elastography estimates the mechanical properties of the tissue from two Radio-
Frequency (RF) frames collected before and after tissue deformation due to an external or …