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Fig. 1 —32-year-old male volunteer with dorsocaudal branch of right hepatic lobe draining into central left hepatic duct. Signal intensity of bile was measured in common bile duct adjacent to insertion of cystic duct (area 1), in left hepatic duct next to hepatic bifurcation (area 2), and in proximal right posterior segmental branch (area 3). Signal intensity of periductal tissue was measured adjacent to common bile duct at level of cystic duct insertion (area 4) and in liver (area 5). SD of noise was measured outside of body (area 6).