Table 1.

Image quality control related to the three.

VARIABLE		GROUP			P
		A	B	C
BMI		17.61 ± 0.91	21.62 ± 1.22	22.76 ± 3.44	0.20
Gender(n)	Male	3	16	5	0.10
	Female	15	40	38
Age		48.06 ± 15.94	42.80 ± 13.45	42.72 ± 9.16	0.25
CTA positioning		6.67 ± 1.94	5.50 ± 2.17	3.35 ± 1.31	0.001
IA		432.42 ± 88.17	426.67 ± 87.84	419.00 ± 81.99	0.82
SIA		65.99 ± 7.52	66.99 ± 6.83	63.95 ± 7.20	0.11
SNRIA		153.53 ± 22.58	155.61 ± 24.33	159.89 ± 29.36	0.61
SNRSIA		23.81 ± 3.80	24.77 ± 3.60	24.57 ± 4.28	0.66
CNRIA		129.73 ± 22.36	130.84 ± 23.26	135.32 ± 27.13	0.60
FA		152.83 ± 15.79	162.36 ± 13.73	160.02 ± 13.97	0.05
SFA		65.76 ± 6.30	67.76 ± 5.20	68.32 ± 6.36	0.29
SNRFA		52.04 ± 6.95	51.40 ± 7.68	51.45 ± 5.22	0.94
SNRSFA		22.39 ± 2.77	21.40 ± 2.59	22.00 ± 2.75	0.31
CNRFA		29.64 ± 6.05	30.00 ± 6.00	29.44 ± 4.82	0.89
CFA		463.78 ± 83.81	420.70 ± 68.01	434.35 ± 76.14	0.10
SCFA		65.00 ± 5.70	65.55 ± 3.67	67.31 ± 5.40	0.10
SNRCFA		156.46 ± 39.23	146.85 ± 31.66	155.46 ± 23.72	0.29
SNRCFA		22.07 ± 4.22	23.17 ± 5.56	24.39 ± 3.71	0.19
CNRCFA		134.39 ± 37.41	123.67 ± 28.09	131.07 ± 22.58	0.25

BMI, CTA positioning difference between CTA positioning and intraoperative positioning. IA, FA, and CFA referred to the average CT values of the three groups of blood vessels. SIA, SFA, and SCF referred to the average CT values of the three groups of para-arterial soft tissues. SNRIA, SNRFA, and SCFA, referred to SNR of the three groups of blood vessels. SNRSIA, SNRSFA, and SNRCFA referred to the soft tissue SNR of the three groups. CNRIA, CNRFA, and CNRCFA referred to CNRs of the three groups of arteries.