Enhancement of echo-signal correlation in elastography using temporal stretching
- 1 January 1997
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 44 (1) , 173-180
- https://doi.org/10.1109/58.585213
Abstract
Echo-signal decorrelation due to tissue compression is a significant source of error in tissue displacement estimates obtained using crosscorrelation. Tissue displacement estimates are used to compute strain values for imaging the elasticity of biological soft tissues. The correlation coefficient between the pre- and post-compression echo rf signals reduces rapidly with signal decorrelation due to increased compression. Miniscule reductions in the value of the correlation coefficient can have a significant impact on the performance of the strain estimator as illustrated by the strain filter. Reducing the rate of signal decorrelation using temporal stretching (which improves the value of the correlation coefficient), significantly improves the performance of the strain filter. The reduction in the rate of signal decorrelation with the subsequent increase in the correlation coefficient using temporal stretching is discussed in this paper. Theoretical, simulation and experimental results quantify the enhancement in the value of the correlation coefficient attained with temporal stretching.Keywords
This publication has 12 references indexed in Scilit:
- Ultrasonic biomechanical strain gauge based on speckle trackingPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- Measurement of arterial wall motion using Fourier based speckle tracking algorithmsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Reduction of signal decorrelation from mechanical compression of tissues by temporal stretching: Applications to elastographyUltrasound in Medicine & Biology, 1997
- A theoretical framework for performance characterization of elastography: the strain filterIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1997
- The combined effect of signal decorrelation and random noise on the variance of time delay estimationIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1997
- Deformation models and correlation analysis in elastographyThe Journal of the Acoustical Society of America, 1996
- Ultrasonic texture motion analysis: theory and simulationIEEE Transactions on Medical Imaging, 1995
- Spectral tissue strain: A new technique for imaging tissue strain using intravascular ultrasoundUltrasound in Medicine & Biology, 1994
- Elastography: Elasticity Imaging Using Ultrasound with Application to Muscle and Breast In VivoUltrasonic Imaging, 1993
- Reduction of Image Noise in ElastographyUltrasonic Imaging, 1993