Ultrasound propagation in anisotropic soft tissues: The application of linear elastic theory

Elastography: A systems approach

“…To first approximation, tissue has been assumed and the changes of these properties due to disease presents a isotropic [3,5,6], although there is evidence of anisotropic properfundamental challenge in the development of elastography, since ties of ultrasound propagation in some soft tissues such as muscle we attempt to image a tissue parameter without quantitative [7]. Even for relatively small strains (õ10%), tissue exhibits knowledge of its true magnitude and changes due to disease.…”

“…Thus, the elastic properties Moreover, methods for such quantitative measurements are not of tissue may be better defined if they are specified at a given yet well developed. operating strain or stress [5][6][7].…”

Elastography: Principles and considerations for clinical research in veterinary medicine cibele

“…Tissues may show greater or smaller viscoelastic behavior depending on the presence and quantity of certain components, including fluid flow at the site and the ability of fibers within the tissue to undergo stress relaxation. Thus, most soft tissues appear isotropic when a mechanical stress force is applied (Parker et al, 1990;Sarvazyan, 1993;Palmieri and Nightingale, 2011), although there is evidence that some soft tissues, for example, muscles, possess anisotropic mechanical and ultrasonographic properties (Levinson, 1987).…”

“…Furthermore, the estimation and imaging of tissue displacement is, by definition, a three-dimensional problem. When a tissue is deformed, the apparent proximal noncompressibility of most soft tissues means that stress components are generated in all directions simultaneously (Levinson, 1987;Han et al, 2003). In ultrasound The compression waves move particles in a medium along the direction of motion, while, when shear waves are applied, the particles oscillate perpendicular to the direction of motion.…”

“…This parameter can be easily adjusted in devices that produce one-dimensional images (for example, in M-mode). However, a PRF is required to produce two-dimensional multiaxial images; such images cannot be obtained using conventional technology devices (Levinson, 1987;O'Brian and Holmes, 2007;Hoskins, 2012).…”