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A and B, Boxplots of attenuation coefficient (α) and nonlinearity coefficient (b) estimated based on spectral difference method (SDM) and spectral log difference method (SLDM). C and D, One example of attenuation coefficient estimation in the homogeneous phantom for SDM (C) and SLDM (D). (The attenuation and nonlinearity coefficients measured from transmission method are .)
