Table 4.

Visual stimulation data¹,² for the three iVASO methods and conventional VASO.

TR/TI (ms)	Method	Activated Voxels3	ΔS/S (%)	SNR	tSNR	CNR
5000/1054	Seq. I	2731±204	−0.62±0.04	347±8	313±11	6.56±0.51
	Seq. IIa	2388±224	−0.66±0.06	308±16	290±10	6.54±0.36
	Seq. IIb	2698±220	−0.69±0.04	308±16	287±9	6.96±0.36
	VASO	1910±213	−1.46±0.15	104±4	99±10	4.88±0.54
2000/711	Seq. I	2219±183	−0.59±0.06	319±9	283±10	9.09±0.89
	Seq. IIa	2286±168	−0.60±0.07	288±8	254±13	8.58±0.80
	Seq. IIb	2102±230	−0.59±0.05	302±7	282±6	8.92±0.89
	VASO	2252±216	−2.16±0.32	66±3	63±5	7.32±1.07
1000/424	Seq. I	2294±108	−0.47±0.03	227±9	201±11	7.22±0.47
	Seq. IIa	2053±211	−0.48±0.03	207±6	188±8	6.74±0.61
	Seq. IIb	2210±134	−0.51±0.03	196±6	181±9	7.29±0.42
	VASO	893±131	N/A	N/A	N/A	N/A

¹n=7, mean ± standard deviation.

²All ΔS/S, SNR, tSNR and CNR are averaged over voxels that were activated in all four experiments of the same TR/TI. Therefore, SNR and tSNR reported here is per image per voxel based. CNR is per voxel per minute based.

³The number of voxels is based on the reconstructed image resolution (256×256).