Figure 2.

Boxplots showing a comparison between benign and malignant nodules as demonstrated by CT_40keV, λ_HU, and NIC in both the AP and VP. All parameters had significantly higher values in the malignant group than in the benign group (all P<0.001). AP, arterial phase; VP, venous phase; BN, benign pulmonary nodule; MN, malignant pulmonary nodule; CT_40keV, the HU value of 40 keV monochromatic images at the measured location; λ_HU, the slope of the spectral HU curve; NIC, the normalized iodine concentration.