“…To reduce the unnecessary number of biopsy cases, other noninvasive methods for diagnosis have been applied widely, especially imaging techniques such as ultrasound (US) (e.g., see [2][3][4][5][6][7][8][9]), computed tomography (CT) (e.g., see [4,[10][11][12][13][14][15]) or magnetic resonance imaging (MRI) (e.g., see [2,3,12,16]). Among those methods, ultrasound imaging, with unique advances advantages such as no radiation, low cost, easy operation, and noninvasiveness, is widely used to visualize the liver for clinical diagnoses.…”