Table 2. Percent change in the blood flow indices (TTP and dBF) obtained by analysis of attenuation (ΔA) and variance (ΔV) of DTOF during hypocapnia. Measurements were obtained directly on the brain and on the contralateral scalp. The error values are relative to the CBF change measured by CT perfusion (CTP). The thickness of the extracerebral layer was 10.2 mm and 11.2 mm for animal 1 and 2, respectively.

	Animal #1			Animal #2
	Percent Change	Error		Percent Change	Error
Ipsilateral (brain)
CTP brain	−32.0%	-		−44.4%	-
CTP scalp	-	-		-	-
ΔA TTP	−16.7%	15.3%		10.5%	54.9%
ΔV TTP	−21.1%	10.9%		4.5%	48.9%
ΔA dBF	−28.0%	3.9%		−45.5%	−1.1%
ΔV dBF	−31.6%	0.4%		−42.3%	2.1%
Contralateral (scalp)
CTP brain	−31.7%	-		−42.2%	-
CTP scalp	−19.1%	-		−29.3%	-
ΔA TTP	−16.7%	15.1%		−22.2%	20.0%
ΔV TTP	−20.0%	11.7%		−26.3%	15.9%
ΔA dBF	−20.9%	10.9%		−27.4%	14.8%
ΔV dBF	−31.6%	0.1%		−42.7%	−0.5%