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Attenuation coefficient estimates for phantoms with a SOS of 1540 m/s, with sample attenuation coefficient of (a) 0.5, (b) 0.3, (c) 0.7 (dB/cm)/MHz. In all cases the reference phantom has a 0.5 (dB/cm)/MHz attenuation coefficient, a 50 μm scatterer diameter, and 1540 m/s sound speed. The frequency range is 2–9 MHz.
