Elastography measures tissue stiffness by assessing

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Elastography evaluates how stiff tissue is by looking at its elasticity. The technique applies a small mechanical stress (like compression or an acoustic force) and then measures how much the tissue deforms or how fast waves travel through it. Tissues that are stiffer resist deformation more and show less strain and faster wave speeds, which translates into a higher measured elasticity or stiffness. So the fundamental property being assessed is elasticity, not temperature, color, or density. Temperature isn’t about mechanical response, color is just a visual map of stiffness on the image, and density refers to mass per volume rather than how the tissue responds to stress.