N-CTCP can accurately define the obstructive site in extrahepatic biliary obstruction. The specificity for the diagnosis of extrahepatic choledocholithiasis and malignant biliary obstruction is very high when combining with ASI.

• N -CTCP对肝外胆管梗阻定位准确 ,结合轴面源像 (ASI) ,对肝外胆管结石及恶性胆管梗阻的判断有较高的准确性。