Abstract: Objective To investigate the application of whole abdomen thin slice coronal single shot fast spin echo sequence of MRI in the diagnosis of children with intrahepaitc and extrahepatic bile duct diseases. Method 26 children with biliary system diseases（biliary atresia in 8,biliary dilatation in 14,gall bladder stone in 2 and biliary stone in 2） were recruited in our hospital between October 2014 and September 2016. The full abdomen thin-layer coronal single excitation scanning fast spin echo sequence was performed,and MRI enhancement scanning was done in 9 cases after 15~20 minutes. The bile duct and its branches of livers inside and outside were observed. Result The intrahepatic bile duct was displayed properly in children with biliary atresia,and the shape of gallbladder was fine and did not show extrahepatic biliary duct in 2 cases,did not show bile duct and gallbladder in 6 cases. 4 cases appeared with hepatosplenomegaly,2 cases demonstrated the long triangle T₂ signal in the hepatic portal area;11 children with biliary dilatation showed common bile duct fusiformis dilatation,1 cases presented with Caroli disease,2 cases appeared hepatic cystic mass,and 4 cases appeared with enlarged gallbladder and intrahepatic biliary dilatation;children with biliary calculi had common bile duct lumen local uniformed signal, and short T₂ signal filling defect. The gallbladder neck short T₂ signal filling defect was observed in 1 child with gallbladder stones;as compared to the scanned images at the same level,the delayed enhancement of MRI scan showed the reduced liver and pancreatic parenchyma signal,and increased intraductal long T₂ signal and the biliary system was more clear. Conclusion As compared with the conventional MRI scan,the whole abdomen thin coronal single shot fast spin echo sequences can provide more detailed observation in the biliary system in patients,especially in children,and give us a more comprehensive understanding of the whole lesions in clinical practice.

Key words: Bile duct diseases, Magnetic resonance imaging, Whole abdomen thin coronal single shot fast spin echo sequences, Diagnosis