Characterisation of Elastic and Acoustic Properties of an Agar-Based Tissue Mimicking Material
| Autor: | DJ Mehta, Carola Kruse, Simon Shaw, Harvey Thomas Banks, Z. R. Kenz, MJ Birch, Shuhua Hu, Stephen E. Greenwald, J W Reeves, M.P. Brewin, Whiteman |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Shear waves
Materials science Wave propagation Acoustics Quantitative Biology::Tissues and Organs Biomedical Engineering Coronary artery Viscoelasticity Shear modulus symbols.namesake Biomimetic Materials Elastic Modulus Animals Humans Composite material Elastic modulus Ultrasonography Stenosis Phantoms Imaging Acoustic properties Attenuation Acoustic localisation Coronary Stenosis Elastic moduli Poisson’s ratio Poisson's ratio Shear wave Shear (sheet metal) Agar Tissue mimicking material symbols |
| Popis: | 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 Poisson's ratio. Phase velocity and attenuation coefficients, determined by generating and detecting shear waves piezo-electrically in the range 300 Hz-2 kHz, were 3.2-7.5 ms(-1) and 320 dBm(-1). Quasi-static Young's modulus, shear modulus and Poisson's ratio, obtained by compressive or shear loading of cylindrical specimens were 150-160 kPa; 54-56 kPa and 0.37-0.44. The dynamic Young's 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. |
| Databáze: | OpenAIRE |
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