Hepatocellular carcinoma (HCC) is unique regarding diagnosis because the clinical diagnosis without pathology proof is accepted. The dynamic image, including contrast-enhanced computed tomography (CECT) and contrast-enhanced magnetic resonance image (CEMRI) were recognized in many guidelines for diagnosing the HCC. In contrast to the CT and MRI, ultrasound (US) with/without contrast is suggested by several societies as the sufficient surveillance modality. The contrast-enhanced ultrasound (CEUS) has aroused more attentions regarding the rapid improvement of contrast medium. In this study, the investigators conducted a prospective, single-center, open-label trial to compare the efficacy and safety of CEUS + CEMRI in characterizing HCC, in comparison with CECT + CEMRI.