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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Mar 5;66(5):867–875. doi: 10.1109/TUFFC.2019.2903010

Fig. 2.

Fig. 2.

Histogram of all estimated attenuation without any constraints (ai,k,r). The data were acquired from a Fibroscan-calibrated tissue-mimicking phantom with calibrated value of 0.68 dB/cm/MHz. The phantom was imaged with unfocused plane wave imaging at 5 MHz center frequency using a Vantage system. fi range: 4–6 MHz, Δf = fi- fi−1=0.06MHz, a total number of 34 fi was used; zk range: 3 cm, zk = zk-zk−1=0.0055cm, a total number of 550 zk was used; zr range: 3 cm, Δzr = zr-zr−1=0.1cm, a total number of 30 zr was used; A total number of 34 × 550 × 30 = 5.6 × 105 attenuation values were estimated.