Table 2.

Mean ± inter-subject variability of the percentage change in oxygen extraction fraction for cerebral veins of different vessel sizes, across five healthy subjects, measured before and after administration of acetazolamide and caffeine.

Vein	$\frac{{\Delta \text{OEF}}_{\text{Acet}}}{{\text{OEF}}_{\text{Pre}-\text{Acet}}}\%$	$\frac{{\Delta \text{OEF}}_{\text{Caffeine}}}{{\text{OEF}}_{\text{Pre}-\text{Caffeine}}}\%$	Vein	$\frac{{\Delta \text{OEF}}_{\text{Acet}}}{{\text{OEF}}_{\text{Pre}-\text{Acet}}}\%$	$\frac{{\Delta \text{OEF}}_{\text{Caffeine}}}{{\text{OEF}}_{\text{Pre}-\text{Caffeine}}}\%$
R-ICV	−32.6 ± 2.1%	+27.0 ± 3.8%	L-ICV	−31.7 ± 5.1%	+29.9 ± 3.2%
R-TSV	−34.9 ± 3.1%	+27.8 ± 6.4%	L-TSV	−34.1 ± 3.1%	+30.4 ± 5.1%
R-SV	−30.7 ± 6.1%	+27.4 ± 7.4%	L-SV	−31.1 ± 3.6%	+28.1 ± 8.1%
VoG	−31.1 ± 4.7%	+30.3 ± 2.5%	StrS	−32.0 ± 2.4%	+32.0 ± 2.4%

R-ICV, L-ICV: right and left internal cerebral veins; R-TSV, L-TSV: right and left thalamo-striate veins; R-SV, L-SV: right and left septal veins; VoG: vein of Galen; StrS: straight sinus.