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Algorithmic scheme for ultrasound data preprocessing and parametric imaging. An ultrasound envelope image obtained from the absolute value of the Hilbert transform of backscattered signals was used for B-mode imaging; raw image radiofrequency (RF) data were used for entropy imaging. A region of interest (ROI) with a fixed size (3.5 × 3.5 cm2) was used to obtain subimages corresponding to the liver parenchyma (WSL: window side length; PL: pulse length).
