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A technique for imaging viscoelastic properties of a gelatin phantom is illustrated. The object (top-left) is compressed from above and held while the ultrasound system records a series of RF echo frames from which a sequence of strain images (top-centre) is computed. Pixels from the strain-image sequence (bottom-left) are fitted to viscoelastic models to compute retardation-time (Tℓ) images (top-right) that correspond to retardance spectral distribution L(τ) peaks (bottom-right).
