| 1 | Sawatzki M, Meyenberger C, Brand S, et al. Contrast-enhanced ultrasound (CEUS) has excellent diagnostic accuracy in differentiating focal liver lesions: results from a Swiss tertiary gastroenterological centre [J]. Swiss Med Wkly, 2019, 149: w20087. | 
																													
																						| 2 | D'Onofrio M, Crosara S, De Robertis R, et al. Contrast-Enhanced Ultrasound of Focal Liver Lesions [J]. AJR Am J Roentgenol, 2015, 205(1): 56-66. | 
																													
																						| 3 | Chung YE, Kim KW. Contrast-enhanced ultrasonography: advance and current status in abdominal imaging [J]. Ultrasonography, 2015, 34(1): 3-18. | 
																													
																						| 4 | Ferraioli G, Meloni MF. Contrast-enhanced ultrasonography of the liver using SonoVue [J]. Ultrasonography, 2018, 37(1): 25-35. | 
																													
																						| 5 | Guo LH, Xu HX. Contrast-enhanced ultrasound in the diagnosis of hepatocellular carcinoma and intrahepatic cholangiocarcinoma: controversy over the ASSLD guideline [J]. Biomed Res Int, 2015: 349172. | 
																													
																						| 6 | Albrecht T, Blomley M, Bolondi L, et al. Guidelines for the use of contrast agents in ultrasound. January 2004 [J]. Ultraschall Med, 2004, 25(4): 249-256. | 
																													
																						| 7 | Claudon M, Cosgrove D, Albrecht T, et al. Guidelines and good clinical practice recommendations forcontrast enhanced ultrasound (CEUS): update 2008 [J]. Ultraschall Med, 2008, 29(1): 28-44. | 
																													
																						| 8 | Piscaglia F, Nolsøe C, Dietrich CF, et al. The EFSUMB guidelines and recommendations on the clinical practice of contrast enhanced ultrasound (CEUS): update 2011 on non-hepatic applications [J]. Ultraschall Med, 2012, 33(1): 33-59. | 
																													
																						| 9 | Beyer LP, Wassermann F, Pregler B, et al. Characterization of focal liver lesions using CEUS and MRI with liver-specific contrast media: experience of a single radiologic center [J]. Ultraschall Med, 2017, 38(6): 619-625. | 
																													
																						| 10 | Ba-Ssalamah A, Uffmann M, Saini S, et al. Clinical value of MRI liver-specific contrast agents: a tailored examination for a confident non-invasive diagnosis of focal liver lesions [J]. Eur Radiol, 2009, 19(2): 342-357. | 
																													
																						| 11 | Claudon M, Dietrich CF, Choi BI, et al. Guidelines and good clinical practice recommendations for contrast enhanced ultrasound ceus in the liver update 2012 [J]. Ultrasound Med Biol, 2013, 39(2): 187-210. | 
																													
																						| 12 | Zarzour JG, Porter KK, Tchelepi H, et al. Contrast-enhanced ultrasound of benign liver lesions [J]. Abdom Radiol (NY), 2018, 43(4): 848-860. | 
																													
																						| 13 | Kang XN, Zhang XY, Bai J, et al. Analysis of B-ultrasound and contrast-enhanced ultrasound characteristics of different hepatic neuroendocrine neoplasm [J]. World J Gastrointest Oncol, 2019, 11(5): 436-448. | 
																													
																						| 14 | Jang HJ, Kim TK, Burns PN, et al. CEUS: an essential component in a multimodality approach to small nodules in patients at high-risk for hepatocellular carcinoma [J]. Eur J Radiol, 2015, 84(9): 1623-1635. | 
																													
																						| 15 | Kitao A, Zen Y, Matsui O, et al. Hepatocarcinogenesis: multistep changes of drainage vessels at CT during arterial portography and hepatic arteriography—radiologic-pathologic correlation [J]. Radiology, 2009, 252(2): 605-614. | 
																													
																						| 16 | Fukukura Y, Nakashima O, Kusaba A, et al. Angioarchitecture and blood circulation in focal nodular hyperplasia of the liver [J]. J Hepatol, 1998, 29(3): 470-475. | 
																													
																						| 17 | Taimr P, Bröker MEE, Dwarkasing RS, et al. A Model-based prediction of the probability of hepatocellular adenoma and focal nodular hyperplasia based on characteristics on contrast-enhanced ultrasound [J]. Ultrasound Med Biol, 2017, 43(10): 2144-2150. | 
																													
																						| 18 | Kang HJ, Kim JH, Joo I, et al. Additional value of contrast-enhanced ultrasound (CEUS) on arterial phase non-hyperenhancement observations (≥ 2 cm) of CT/MRI for high-risk patients: focusing on the CT/MRI LI-RADS categories LR-3 and LR-4 [J]. Abdom Radiol (NY), 2020, 45(1): 55-63. | 
																													
																						| 19 | Dietrich CF, Averkiou M, Nielsen MB, et al. How to perform contrast-enhanced ultrasound (CEUS) [J]. Ultrasound Int Open, 2018, 4(1): E2-E15. | 
																													
																						| 20 | Dietrich CF, Ignee A, Greis C, et al. Artifacts and pitfalls in contrast-enhanced ultrasound of the liver [J]. Ultraschall Med, 2014, 35(2): 108-125. |