Spectral CT - a new supplementary method for preoperative assessment of pathological grades of esophageal squamous cell carcinoma

Table 2 Comparison of quantitative parameters among ESCC of different degrees of differentiation in AP and VP

Phase	Group	n	VMI_40keV	IC (mg/ml)	WC (mg/ml)	Eff-Z	λ_HU
AP	Well differentiated ESCC	27	137.85 ± 25.18	13.66 ± 3.13	1024.74 ± 7.19	8.43 ± 0.17	2.58 ± 0.59
	Moderately differentiated ESCC	82	162.81 ± 45.75	16.49 ± 5.29	1026.35 ± 5.92	8.58 ± 0.28	3.12 ± 1.00
	Poorly differentiated ESCC	82	172.18 ± 44.41	17.65 ± 5.13	1026.13 ± 8.60	8.64 ± 0.27	3.33 ± 1.00
	F Value		6.518	6.563	0.504	6.907	6.554
	P Value		0.002	0.002	0.605	0.001	0.002
VP	Well differentiated ESCC	27	192.66 ± 29.44	19.85 ± 3.59	1028.66 ± 5.80	8.76 ± 0.18	3.74 ± 0.68
	Moderately differentiated ESCC	82	210.98 ± 80.27	21.31 ± 4.58	1027.24 ± 9.21	8.84 ± 0.24	4.27 ± 2.46
	Poorly differentiated ESCC	82	234.88 ± 44.03	24.88 ± 5.15	1029.18 ± 7.53	9.01 ± 0.24	4.70 ± 0.97
	F Value		5.987	17.217	1.213	3.277	17.877
	P Value		0.003	0.000	0.300	0.040	0.000

Except for the F and P-values, data are reported as mean ± standard deviation.
ESCC Esophageal squamous cell carcinoma, AP Arterial phase, VP Venous phase, VMI Virtual monoenergetic image, IC Iodine concentration, WC Water concentration, Eff-Z Effective atomic number; λ_HU, the slope of the spectral curve.

ISSN: 1471-2342