Objective: To evaluate the value of intraductal ultrasonography (IDUS) in the diagnosis and classification of bile duct stenosis.

目的：评估胆管内超声检查(IDUS)对胆管狭窄病因和分型的诊断价值。

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Objective to compare the diagnostic accuracy of intraductal ultrasonography (IDUS) and endoscopic retrograde cholangiography (ERC) on extrahepatic bile duct stones.

目的比较十二指肠镜下胆管腔内超声(IDUS)和内镜下逆行胆管造影(ERC)诊断肝外胆管结石的作用。

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Objective: To study the clinical value of intraductal ultrasonography (IDUS) in the diagnosis of pancreatic cancer and bile duct cancer.

目的：探讨胰胆管内超声对胰胆肿瘤的诊断价值。

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