Spectral CT Analysis of Solitary Pulmonary Nodules for Differentiating Malignancy from Benignancy: The Value of Iodine Concentration Spatial Distribution Difference

Table 1

Quantitative assessment of NIC and dNIC in the proximal and distal regions of malignant and benign nodules in PP, AP, and VP.

Group	Malignant nodules	Benign nodules	P value
	11.128±6.509	14.381 ±7.010	0.089
	18.410±8.497	19.520 ±8.675	0.633
	17.440±5.637	18.620 ±9.952	0.619
	8.1723±2.176	7.891±1.297	0.591
	9.701±2.922	8.245±1.796	0.020
	8.457±2.292	7.535±1.426	0.060
Longest diameter (mm)	19.26±5.999	15.76±4.847	0.018

PP, pulmonary phase; AP, arterial phase; VP, venous phase; IC: iodine concentration; SD: standard deviation of iodine concentration in all nodules.