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Distinguishment of agar phantoms (diameter: 35 mm; concentrations: 0.8%, 1.5%, and 2%) using sample hysteresis at the same induced displacement magnitudes (OCE: 2.5 µm; Mechanical test: 65 µm). The measurements were repeated 5 times for each test. (a) Hysteresis loops by OCE measurements. (b) Hysteresis loops by mechanical tests. The shadow areas in (a) and (b) were in the range of ± SD. (c) Comparison of the calculated hysteresis loss ratios for the agar phantoms (mean ± SD).
