Characterization of gallbladder stones associated with occult pancreaticobiliary reflux using computed tomography

Figure 3 Non-enhanced CT scans. A: The HU value measurement of homogeneous gallbladder stones; B: The HU value measurement of heterogeneous gallbladder stones. Three 2 cm² circular regions of interest were manually drawn at three different parts of segments VII and VIII of the right lobe of the liver and the middle third of the spleen. The orange circle is the measured bile gray value.