Fig. 3From: Evaluation of the stiffness of normal cervix and its change with different factors using transvaginal two-dimensional shear wave elastography under strict quality controlROI drawing shown in the same figure in Fig. 2. Two circular ROIs with same diameter as 5 mm were put at internal and external cervical os respectively. Quantitative parameters as Emean (mean elasticity), Emax (maximal elasticity) and Emin (minimal elasticity) of each ROI were shown on the screen. ROI: region of interestBack to article page