Intravoxel incoherent motion diffusion-weighted magnetic resonance imaging for predicting histological grade of hepatocellular carcinoma: Comparison with conventional diffusion-weighted imaging

Figure 5 Graphs showing that receiver operating characteristic curves of the intravoxel incoherent motion- diffusion-weighted imaging and conventional diffusion-weighted imaging parameters of hepatocellular carcinoma for differentiating the low-grade group from the high-grade groups, as measured by the two radiologists. A: ROC curves of the parameters of HCC by radiologist 1; B: ROC curves of the parameters of HCC by radiologist 2. The area under curve (AUC) for D was the largest of all the parameters obtained by the two radiologists. R1: Radiologist 1; R2: Radiologist 2; HCC: Hepatocellular carcinomas; IVIM: Intravoxel incoherent motion; DWI: Diffusion-weighted imaging, ADC: Apparent diffusion coefficient; D: Pure diffusion coefficient; D*: Pseudo-diffusion coefficient; f: Perfusion fraction.