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Siavash Kazemirad, Simon Bernard, Samuel Hybois, An Tang, Guy Cloutier
Ultrasound shear wave elastography methods are commonly used for estimation of mechanical properties of soft biological tissues in diagnostic medicine. A limitation of most currently used elastography methods is that they only yield the shear storage modulus (G') but not the loss modulus (G''). Therefore, no information on viscosity or loss tangent (tanĪ“) is provided. In this study, an ultrasound shear wave viscoelastography method is developed for model-independent quantification of frequency-dependent viscoelastic complex shear modulus of macroscopically homogeneous tissues...
June 28, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
John J Pitre, Leo B Koziol, Grant H Kruger, Alan Vollmer, Jonathan Ophir, Jean-Jacques Ammann, William F Weitzel, Joseph L Bull
Management of fluid overload in patients with end-stage renal disease represents a unique challenge to clinical practice because of the lack of accurate and objective measurement methods. Currently, peripheral edema is subjectively assessed by palpation of the patient's extremities, ostensibly a qualitative indication of tissue viscoelastic properties. New robust quantitative estimates of tissue fluid content would allow clinicians to better guide treatment, minimizing reactive treatment decision making. Ultrasound viscoelastography (UVE) can be used to estimate strain in viscoelastic tissue, deriving material properties that can help guide treatment...
September 2016: Ultrasound in Medicine & Biology
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