A simple method to determine the resolution of operative cholangiograms

A cholangiographic technique which facilitates visualization of the catheter itself permits the surgeon to measure the resolution of the roentgenographic technique used. When the wall of the catheter is visible, the surgeon can be confident that the resolution of the technique is in the 0.3 mm range. It is unlikely that stones greater than 0.3 mm in diameter will be missed using this technique.