Biological tissue: The elastic properties of biological tissue show much greater contrast than their optical properties. Cells can be imaged in an aqueous medium, so that the variation with environment and time of their mechanical properties and adhesion to a substrate can be measured. For soft tissue, time‐resolved techniques are more relevant than Rayleigh wave interference. Mineralized tissues such as teeth can support Rayleigh waves, giving contrast from carious lesions and allowing line‐focus‐beam V(z) analysis to measure elastic anisotropy. Bone is an intermediate case, with contrast from its mechanical structure.
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