The shear elastic modulus estimated from the SDUV, matched the elastic modulus measured by indentation. Shear elastic moduli derived from shear wave group velocities were 1.78, 5.2 and 7.18 kPa for the gelatin phantoms respectively. SDUV measurements were 1.61, 3.57 and 5.37 kPa for the gelatin phantoms respectively. The shear elastic moduli from indentation were 1.16, 3.40 and 5.6 kPa for a 7, 10 and 15% gelatin phantom respectively. In addition, the indentation measurements are compared to estimates of elasticity derived from shear wave group velocities.
In this study we present an independent validation method of shear elastic modulus estimation by SDUV in 3 gelatin phantoms of differing stiffness. However, there is not a gold standard method for validation. A method called Shearwave Dispersion Ultrasound Vibrometry (SDUV) can be used to quantify tissue viscoelasticity by measuring dispersion of shear wave propagation speed. It is well known that biological tissues are viscoelastic materials therefore velocity dispersion resulting from material viscoelasticity is expected. Several groups have proposed shear wave propagation speed to quantify tissue mechanical properties. Tissue mechanical properties such as elasticity are linked to tissue pathology state. Chen, Shigao Chen, Qingshan An, Kai-Nan Greenleaf, James F.
Shear elastic modulus estimation from indentation and SDUV on gelatin phantomsĪmador, Carolina Urban, Matthew W.