Peak position estimation algorithms for cross-correlation function in elastography

CX Ding, J Bai - Proceedings of the 20th Annual International …, 1998 - ieeexplore.ieee.org
In ultrasound elastography, the resolution and accuracy of strain estimation are bounded by
the sampling period when the echo signal is digitized. Here, the authors describe three new …

Improvement of elastographic displacement estimation using a two-step cross-correlation method

H Chen, H Shi, T Varghese - Ultrasound in medicine & biology, 2007 - Elsevier
The cross-correlation algorithm used to compute the local strain components for
elastographic imaging requires a minimum radio-frequency data segment length of around …

Enhancement of echo-signal correlation in elastography using temporal stretching

T Varghese, J Ophir - IEEE transactions on ultrasonics …, 1997 - ieeexplore.ieee.org
Echo-signal decorrelation due to tissue compression is a significant source of error in tissue
displacement estimates obtained using crosscorrelation. Tissue displacement estimates are …

Reduction of signal decorrelation from mechanical compression of tissues by temporal stretching: Applications to elastography

SK Alam, J Ophir - Ultrasound in medicine & biology, 1997 - Elsevier
Elastography is based on the estimation of strain due to tissue compression. Strain is
computed from the estimates of time delays between gated precompression and …

Noise reduction in elastograms using temporal stretching with multicompression averaging

T Varghese, J Ophir, I Cespedes - Ultrasound in medicine & biology, 1996 - Elsevier
Elastography uses estimates of the time delay (obtained by cross-correlation) to compute
strain estimates in tissue due to quasistatic compression. Because the time delay estimates …

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 …

Novel estimators for elastography

SK Alam, FL Lizzi, EJ Feleppa… - Medical Imaging 2001 …, 2001 - spiedigitallibrary.org
In conventional elastography, strains are estimated by computing gradient of estimated
displacement. However, gradient-based algorithms are susceptible to noise. We have …

Direct strain estimation in elastography using spectral cross-correlation

T Varghese, EE Konofagou, J Ophir, SK Alam… - Ultrasound in medicine …, 2000 - Elsevier
Spectral estimation of tissue strain has been performed previously by using the centroid shift
of the power spectrum or by estimating the variation in the mean scatterer spacing in the …

Theoretical bounds on strain estimation in elastography

I Cespedes, M Insana, J Ophir - IEEE transactions on …, 1995 - ieeexplore.ieee.org
Elastography is a technique for the estimation of tissue elasticity that is based on the
estimation of strain. Tissue strain can be estimated by finite difference computations of echo …

Ultrasound elastography: a dynamic programming approach

H Rivaz, E Boctor, P Foroughi, R Zellars… - IEEE transactions on …, 2008 - ieeexplore.ieee.org
This paper introduces a 2-D strain imaging technique based on minimizing a cost function
using dynamic programming (DP). The cost function incorporates similarity of echo …