Fig. 6
From: Gallstones top to toe: what the radiologist needs to know
Normal cholescintogram 80 min post-injection of mebrofenin labeled with technetium-99. The radio-isotope is taken up by the liver and excreted into bile. Bile will pool in a non-obstructed normal gallbladder (arrow). In a gallbladder obstructed due to gallstones, the radioactive bile is unable to pool