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We have recently demonstrated the feasibility of vascular guided wave imaging (VGWI) in non-invasive estimation of bi-plane (i.e., longitudinal and transverse) transmural arterial Young's modulus (ELV, ETV) in tubular phantoms using phase velocity (cph) (Guo et al., ITEC 2016). In this study, we further compare the ETV estimated from the circumferential Lamb type (CLT) wave by VGWI with ETP from the...
Ultrasound shear wave imaging is a rapidly emerging technique that noninvasively quantifies shear wave speed (SWS), which is directly linked to the stiffness of soft tissues. Targeting sources of estimation errors entailed in in vivo data, previous studies have proposed different methods, e.g. radon sum (RS) (Rouze et al. 2010), under the assumption of tissue homogeneity, which significantly limits...
The nonlinear shear modulus was found to exhibit higher contrast than shear modulus for the detection of breast lesions (Bernal, Chamming's et al. 2016) and may thus serve as a potential diagnostic index of tissue pathology. Such nonlinear elastic constant of soft tissues has been demonstrated to be effectively estimated by combining ultrasound elastography and supersonic shear imaging based on acoustoelastic...
Ultrasound shear wave imaging has been extensively studied in thin tissues, such as the artery and cornea. The dispersion analysis of the guided wave propagating in such layered structures based on a modified Lamb wave model for homogeneous and isotropic thin soft media in water has been shown to yield accurate elasticity estimates. Nonetheless, thin soft tissues are often bounded with other tissue...
Ultrasound shear wave elastography (SWE) is an emerging technique for characterizing local arterial stiffness - a known indicator for vascular health. However, the implications due to vascular anatomy and tissue environment are still relatively under-examined. Using polyvinyl alcohol (PVA) based tissue mimicking phantoms, this study assessed the current signal processing framework in demonstrating...
Two-dimensional (2-D) myocardial elastography is a radio-frequency (RF)-based speckle tracking technique that uses one-dimensional (1-D) cross-correlation and recorrelation methods in a 2-D search, and can estimate and image the 2-D transmural motion and deformation of the myocardium so as to characterize the cardiac function. Based on a three-dimensional (3-D) finite-element (FE) canine left-ventricular...
Myocardial elastography (ME), a radio frequency (RF)-based speckle tracking technique with one-dimensional (1-D) cross correlation and novel recorrelation methods in a 2-D search was proposed to estimate and fully image 2-1) transmural deformation field and to detect abnormal cardiac function. A theoretical framework was first developed in order to evaluate the performance of 2-D myocardial elastography...
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