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. 60 patients with liver tumours no larger than 3cm in diameter will be enrolled, and tumour specimen will be obtained after imaging examination by tumour resection or biopsy. The primary endpoint is the sensitivity and specificity between the study groups, use the histology as reference diagnosis. The secondary endpoints include (1) the sensitivity and specificity of CEUS+CECT, CECT+CEMRI in differential diagnosis of liver tomours as malignant or benign, use the histology as reference diagnosis, (2) adverse effects, (3) vital signs (blood pressure, heart rate), and (4) laboratory values (the hematologic, renal and hepatic function change). Our exploratory endpoint is the detection rate of CEUS+CEMRI, CECT+CEMRI, use the histology as reference diagnosis.