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梗阻性黄疸的病因诊断一直是影像学诊断的难点，通过２１例病例探讨此三种方法的优、缺点以及何种方法做为该病诊断的首选方法。结果：梗阻性黄疸病因诊断率Ｂｕｓ８０．９％，ＣＴ５７．１％，ＥＲＣＰ８６．７％。结论：ＣＴ对胰头癌及其腹腔转移诊断效果好；ＥＲＣＰ对壶腹癌、总胆管下段肿物、慢性胰腺炎诊断效果好；Ｂｕｓ对胰头癌＝总胆管结石、胆道蛔虫诊断效果好；Ｂｕｓ应做为梗阻性黄疸病因检查的首选，必要时进行合理的诊断配伍
The etiological diagnosis of obstructive jaundice has been the difficult point of imaging diagnosis. The advantages and disadvantages of these three methods and the methods are discussed in 21 cases as the first choice for the diagnosis of this disease. Results: Obstructive jaundice diagnosis rate Bus80.9%, CT57.1%, ERCP86.7%. Conclusion: CT has a good diagnostic value for pancreatic cancer and peritoneal metastasis; ERCP has a good diagnostic value for ampullary carcinoma, lower bile duct mass and chronic pancreatitis; Bus has a good diagnostic value for pancreatic head cancer = total bile duct stones and biliary ascariasis; Bus should be used as the first choice of etiological examination of obstructive jaundice, if necessary, a reasonable diagnostic compatibility