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contributor authorSalehabadi, Melika;Crutison, Joseph;Klatt, Dieter;Royston, Thomas J.
date accessioned2023-04-06T12:55:38Z
date available2023-04-06T12:55:38Z
date copyright12/23/2022 12:00:00 AM
date issued2022
identifier issn25727958
identifier otherjesmdt_006_02_021003.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4288769
description abstractDynamic elastography, whether based on magnetic resonance, ultrasound, or optical modalities, attempts to reconstruct quantitative maps of the viscoelastic properties of biological tissue, properties altered by disease and injury, by noninvasively measuring mechanical wave motion in the tissue. Most reconstruction strategies that have been developed neglect boundary conditions, including quasistatic tensile or compressive loading resulting in a nonzero prestress. Significant prestress is inherent to the functional role of some biological tissues currently being studied using elastography, such as skeletal and cardiac muscle, arterial walls, and the cornea. In the present article a configuration, inspired by muscle elastography but generalizable to other applications, is analytically and experimentally studied. A hyperelastic polymer phantom cylinder is statically elongated in the axial direction while its response to transversepolarized vibratory excitation is measured. We examine the interplay between uniaxial prestress and waveguide effects in this musclelike tissue phantom using computational finite element simulations and magnetic resonance elastography measurements. Finite deformations caused by prestress coupled with waveguide effects lead to results that are predicted by a coordinate transformation approach that has been previously used to simplify reconstruction of anisotropic properties using elastography. Here, the approach estimates material viscoelastic properties that are independent of the nonhomogeneous prestress conditions without requiring advanced knowledge of those stress conditions.
publisherThe American Society of Mechanical Engineers (ASME)
titleDecoupling Uniaxial Tensile Prestress and Waveguide Effects From Estimates of the Complex Shear Modulus in a Cylindrical Structure Using TransversePolarized Dynamic Elastography
typeJournal Paper
journal volume6
journal issue2
journal titleJournal of Engineering and Science in Medical Diagnostics and Therapy
identifier doi10.1115/1.4056411
journal fristpage21003
journal lastpage210038
page8
treeJournal of Engineering and Science in Medical Diagnostics and Therapy:;2022:;volume( 006 ):;issue: 002
contenttypeFulltext


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