Quantitative parameters in novel spectral computed tomography: Assessment of Ki-67 expression in patients with gastric adenocarcinoma

Figure 3 A 57-year-old man with gastric adenocarcinoma in the antrum. A: The 70 kilo electron volt (kev) image in arterial phase (AP) show that the computed tomography attenuation value of 70 kev (CT_{70 kev}) value of solid mass is 128.8 HU; B: The iodine map in AP show that the iodine concentration (IC) value of solid mass is 3.44 mg/mL; C: The effective atomic map in AP show that the effective atomic number (Z^eff) value of solid mass is 8.25; D: Histologic specimen shows a gastric adenocarcinoma of T4 staging in solid with HE staining (magnification, × 200); E: A 70 kev image in venous phase (VP) show that the CT_70kev value of solid mass is 146.9 HU; F: An iodine map in VP show that the IC value of solid mass is 3.32 mg/mL; G: An effective atomic map in VP show that the Z^eff value of solid mass is 8.65; H: Ki-67 immunohistochemical staining demonstrated that approximately 80% of cells were positive for nuclear staining (magnification, × 400).