The images below are from a person that was evaluated for hepatobiliary disease. He received an intravenous injection of a technetium-labeled compound that is rapidly cleared from the circulation by uptake in the liver and excretion in bile. The first graphic below shows a composite labeled image to help orient you anatomically - the large black spot on both sides is the gallbladder, which is surrounded by a lighter grey mass which is the liver.
Right animation shows images after the gallbladder was filled.
As the streak becomes visible, the black spot representing the gallbladder decreases in size and almost disappears as bile is squeezed into the small intestine. He was sent home with a sucker for being a good patient.