23 research outputs found
Characterisation of Elastic and Acoustic Properties of an Agar-Based Tissue Mimicking Material
As a first step towards an acoustic localisation device for coronary stenosis to provide a non-invasive means of diagnosing arterial disease, measurements are reported for an agar-based tissue mimicking material (TMM) of the shear wave propagation velocity, attenuation and viscoelastic constants, together with one dimensional quasi-static elastic moduli and Poissonâs ratio. Phase velocity and attenuation coefficients, determined by generating and detecting shear waves piezo-electrically in the range 300 Hzâ2 kHz, were 3.2â7.5 msâ1 and 320 dBmâ1. Quasi-static Youngâs modulus, shear modulus and Poissonâs ratio, obtained by compressive or shear loading of cylindrical specimens were 150â160 kPa; 54â56 kPa and 0.37â0.44. The dynamic Youngâs and shear moduli, derived from fitting viscoelastic internal variables by an iterative statistical inverse solver to freely oscillating specimens were 230 and 33 kPa and the corresponding relaxation times, 0.046 and 0.036 s. The results were self-consistent, repeatable and provide baseline data required for the computational modelling of wave propagation in a phantom