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Experimental estimates and theoretical predictions of the backscatter coefficient of Sphere A as function of frequency. (a) Laboratory characterization using single element transducers, (b) Siemens transducers, (c) Ultrasonix and VisualSonics transducers, and (d) Zonare transducers. Vertical bars indicate the low-frequency analysis range (LWR) and the high-frequency range (HWR).
