Dual energy computed tomography for detection of metastatic lymph nodes in patients with hepatocellular carcinoma

Figure 3 Receiver operating characteristic curve analysis of dual energy computed tomography quantitative parameters for metastatic and non-metastatic lymph nodes. A: Maximal short axis diameter of lymph nodes; B: Iodine concentration (IC)/normalized IC (NIC) in the arterial phase; C: IC/NIC in the portal phase; D: IC/NIC in the delayed phase; E: Slope of the spectral curve (λ_HU) in three contrast-enhanced phases; F: Combination of maximal short axis diameter of lymph nodes with λ_HU, IC, or NIC in the portal phase. IC: Iodine concentration; NIC: Normalized iodine concentration; λ_HU: Slope of the spectral curve; AP: Arterial phase; PP: Portal phase; DP: Delayed phase.