Detection of gallbladder stones by dual-energy spectral computed tomography imaging

Figure 1 Gallbladder stones. A: Gallbladder stone shown by the red arrow was not visualized at 70 keV (traditional polychromatic images); B: Gallbladder stone shown by the red arrow had a visible low-density stone shadow in 40 keV monochromatic images; C: Gallbladder stone shown by the red arrow was not visualized in 140 keV monochromatic images; D: Gallbladder stone shown by the red arrow had a visible low-density stone shadow in calcium base images. E: Gallbladder stone shown by the red arrow had a significant high-density stone shadow in lipid base images.