Comput Math Methods Med - Quantitative imaging of young's modulus of soft tissues from ultrasound water jet indentation: a finite element study.

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Resumo

Indentation testing is a widely used approach to evaluate mechanical characteristics of soft tissues quantitatively. Young's modulus of soft tissue can be calculated from the force-deformation data with known tissue thickness and Poisson's ratio using Hayes' equation. Our group previously developed a noncontact indentation system using a water jet as a soft indenter as well as the coupling medium for the propagation of high-frequency ultrasound. The novel system has shown its ability to detect the early degeneration of articular cartilage. However, there is still lack of a quantitative method to extract the intrinsic mechanical properties of soft tissue from water jet indentation. The purpose of this study is to investigate the relationship between the loading-unloading curves and the mechanical properties of soft tissues to provide an imaging technique of tissue mechanical properties. A 3D finite element model of water jet indentation was developed with consideration of finite deformation effect. An improved Hayes' equation has been derived by introducing a new scaling factor which is dependent on Poisson's ratios v, aspect ratio a/h (the radius of the indenter/the thickness of the test tissue), and deformation ratio d/h. With this model, the Young's modulus of soft tissue can be quantitatively evaluated and imaged with the error no more than 2%.

Resumo Limpo

indent test wide use approach evalu mechan characterist soft tissu quantit young modulus soft tissu can calcul forcedeform data known tissu thick poisson ratio use hay equat group previous develop noncontact indent system use water jet soft indent well coupl medium propag highfrequ ultrasound novel system shown abil detect earli degener articular cartilag howev still lack quantit method extract intrins mechan properti soft tissu water jet indent purpos studi investig relationship loadingunload curv mechan properti soft tissu provid imag techniqu tissu mechan properti d finit element model water jet indent develop consider finit deform effect improv hay equat deriv introduc new scale factor depend poisson ratio v aspect ratio ah radius indenterth thick test tissu deform ratio dh model young modulus soft tissu can quantit evalu imag error

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