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Box plots showing that IC in the arterial and the venous phases (A), NIC in the arterial and the venous phases (B), λHU in the arterial and the venous phases (C), and diameter (D) had statistical significance in the prediction of metastatic and non-metastatic lymph nodes. *, P<0.05; **, P<0.002; ***, P<0.001. IC, iodine concentration; IAP, in the arterial phase; M, metastasis; IVP, in the venous phase; NIC, normalized iodine concentration; λHU, the slope of energy spectrum curve.
