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. Author manuscript; available in PMC: 2022 Mar 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2021 Feb 25;68(3):389–405. doi: 10.1109/TUFFC.2020.2968147

TABLE I:

Mean, standard deviation and uniformity coefficient (i.e. CV = SD/MEAN) of the phase velocity and viscoelastic parameters μ1 and μ2, calculated for the LISA numerical phantoms within the ROIs marked in Figs. 3 and 4. Results in triangular brackets, 〈·〉, present mean error calculated using the true values.

Parameter Unit Phantom 1 Phantom 2 Phantom 3
Mean±SD CV Mean±SD CV Mean±SD CV
Vph, filters Off [m/s] 4.33±0.00 (150 Hz) 0.00 2.05±0.18 (200 Hz) 0.09 1.41±0.11 (150 Hz) 0.08
Vph, filters On [m/s] 4.33±0.00 (150 Hz) 0.00 2.04±0.05 (200 Hz) 0.02 1.38±0.04 (150 Hz) 0.03
Vph, filters Off [m/s] 4.74±0.01 (350 Hz) 0.00 2.04±0.27 (300 Hz) 0.13 1.60±0.24 (250 Hz) 0.15
Vph, filters On [m/s] 4.72±0.03 (350 Hz) 0.01 2.11±0.02 (300 Hz) 0.01 1.45±0.04 (250 Hz) 0.03
Vph, filters Off [m/s] 7.07±0.35 (550 Hz) 0.05 10.02±6.42 (400 Hz) 0.64 2.87±1.23 (350 Hz) 0.43
Vph, filters On [m/s] 4.67±0.04 (550 Hz) 0.01 2.28±0.06 (400 Hz) 0.03 1.61±0.09 (350 Hz) 0.06
μ1, LPVI* [kPa] 19.27±0.28 (4.83) 0.01 3.39±0.23 (0.05) 0.07 1.71±0.09 (0.23) 0.05
μ1, F2D [kPa] 17.39 (2.93) - 3.24 (0.10) 1.63 (0.15) -
μ2, LPVI* [Pa·s] 3.56±0.18 (0.56) 0.05 1.28±0.11 (0.03) 0.09 0.75±0.12 (0.00) 0.16
μ2, F2D [Pa·s] 2.95 (0.05) - 1.26 (0.01) - 0.75 (0.00) -
*

results for LPVI with adopted bandpass filters. LPVI without applying wavenumber and directional filters are not presented because, the nonlinear least-squares function was unable to solve this problem.