Energy spectrum computed tomography multi-parameter imaging in preoperative assessment of vascular and neuroinvasive status in gastric cancer

Table 2 Comparison of energy spectrum computed tomography parameters between two groups of gastric cancer patients

Project	LVI/PNI positive group (n = 42)	LVI/PNI negative group (n = 20)	T/Z	P value
Arterial phase
CT (HU)	196.5 ± 52.7	150.7 ± 33.9	3.55	0.001
CT (HU)	87.3 ± 19.2	66.4 ± 13.1	4.4	< 0.00
Ka3m)	3.6 ± 1.2	2.8 ± 0.7	2.96	0.004
IC (× 100 μg/cm³)	19.4 ± 6.1	14.9 ± 3.8	2.96	0.004
NIC	0.1 ± 0.0	0.1 ± 0.0	2.46	0.019
Venous phase
CT4 (HU)	242.6 ± 30.4	203.1 ± 27.8	5.06	< 0.001
CT (HU)	103.4 ± 13.3	81.4 ± 11.7	6.62	< 0.001
K4n.m	4.6 ± 0.6	4.1 ± 0.6	3.58	0.001
IC (× 100 μg/cm³)	23.9 (22.4, 27.1)	22.2 (18.9, 23.2)	-3.06	0.002
NIC	0.5 (0.5, 0.6)	0.4 (0.4, 0.5)	-3.10	0.002
Delay period
CT (HU)	185.0 ± 26.6	179.4 ± 23.2	0.82	0.418
CT (HU)	80.4 ± 11.2	72.8 ± 9.9	2.58	0.012
K4n.	3.5 ± 0.5	3.6 ± 0.5	-0.44	0.658
IC (× 100 μg/cm³)	18.5 ± 2.8	18.9 ± 2.8	-0.45	0.652
NIC	0.6 ± 0.	0.5 ± 0.1	2.80	0.007

LVI: Vascular invasion; PNI: Nerve invasion; CT: Computed tomography; IC: Iodine concentration; NIC: Normalized iodine concentration.