4.

非小细胞肺癌纵隔转移与非转移淋巴结能谱CT参数比较(x±s)

Comparison of quantitative dual-energy CT parameters between metastatic and non-metastatic mediastinal lymph nodes in non-small cell lung cancer (x±s)

Characteristic	Metastatic (n=49)	Non-metastatic (n=114)	t	P
IC, iodine concentration; NIC, normalized iodine concentration; λHU, slope of spectral hounsfield unit curve; Zeff, effective atomic number.
Arterial phase
IC/(100 μg/cm3)	22.14±5.11	24.94±3.79	－3.448	＜0.001
NIC	0.25±0.04	0.36±0.09	－10.300	＜0.001
λHU	2.13±0.21	2.33±0.23	－5.194	＜0.001
Zeff	8.07±0.46	8.34±0.51	－3.213	0.002
Venous phase
IC/(100 μg/cm3)	27.24±5.68	30.26±5.60	－3.139	0.002
NIC	0.43±0.07	0.60±0.14	－10.875	＜0.001
λHU	2.46±0.31	2.84±0.29	－7.405	＜0.001
Zeff	8.25±0.37	8.55±0.45	－4.052	＜0.001