Table 4. Diagnostic value of four energy spectrum parameters in the diagnosis of metastatic lymph nodes.

Parameters	Youden index	AUC	Cut-off value	Sensitivity (%)	Specificity (%)	Accuracy (%)
IC	0.745	0.928	>2.56	83.3	91.2	85.3
NIC	0.726	0.875	>0.289	96.1.	76.5	91.2
Spectral curve slope	0.706	0.907	>2.692	88.2	82.4	86.8

AUC, area under the curve; IC, iodine concentration; NIC, normalized iodine concentration.