Table 2:

SNRs and CNRs of the precontrast and postcontrast scan variants 3 and 7^{^a}

	Precontrast		P Value	Postcontrast		P Value
	T1WI VIRTA (Variant 3)^{^f}	T1WI VIRTA (Variant 7)	P Value	T1WI VIRTA (Variant 3)^{^f}	T1WI VIRTA (Variant 7)	P Value
SNR_tissue^{^b}	28.0 ± 1.8	40.5 ± 3.4	.005^{^g}	27.9 ± 1.3	42.4 ± 2.8	.005^{^g}
SNR_{carotid vessel wall}^{^c}	15.3 ± 1.4	20.8 ± 2.7	.005^{^g}	17.2 ± 0.9	26.4 ± 4.0	.005^{^g}
SNR_{basilar vessel wall}	13.0 ± 1.4	15.9 ± 1.7	.005^{^g}	13.4 ± 2.4	19.2 ± 1.8	.005^{^g}
SNR_{suprasellar CSF}	9.1 ± 2.0	11.9 ± 2.2	.007^{^g}	11.3 ± 0.7	14.1 ± 2.4	.013
SNR_pontine _CSF	5.9 ± 2.1	8.0 ± 2.0	.007^{^g}	6.5 ± 1.8	11.2 ± 2.6	.007^{^g}
SNR_blood	3.6 ± 0.6	5.4 ± 1.2	.005^{^g}	3.8 ± 0.5	6.3 ± 1.4	.007^{^g}
SNR_{pituitary gland}	23.0 ± 3.4	33.4 ± 4.7	.005^{^g}	33.3 ± 3.5	49.5 ± 6.7	.005^{^g}

CNR_{carotid vessel wall–CSF}^{^d}	6.1 ± 1.6	9.0 ± 1.5	.005^{^g}	6.0 ± 0.7	12.3 ± 3.6	.007^{^g}
CNR_{basilar vessel wall–CSF}^{^e}	7.2 ± 1.4	7.9 ± 1.4	.059	7.0 ± 2.0	8.0 ± 1.9	.285
CNR_{carotid vessel wall–blood}^{^c}	11.6 ± 1.3	15.5 ± 2.9	.013	13.5 ± 1.0	20.1 ± 3.8	.007^{^g}

↵a Data are mean and SD calculated in 10 subjects. A Wilcoxon signed rank test was used to compare the differences between precontrast variants 3 and 7 and postcontrast variants 3 and 7 (additional statistical comparisons are shown in On-line Table 2).
↵b Tissue ROI is located at the left orbital gyri.
↵c The mean of the left and right distal intracranial internal carotid arteries.
↵d Suprasellar CSF is used as reference.
↵e Pontine CSF is used as reference.
↵f Currently used in our clinic.
↵g Statistically significant (P < .008).