Table 1.

Average baseline and peak P_ETO₂ values and corresponding venous oxygenation (Y_v) estimated according to the interpolation method outlined in Chiarelli et al. (2007). Baseline $R_{2GM}^{*}(S^{-1})$ and the gradients (A) of Δ$R_{2GM}^{*}$ versus (1−Y_v) for both β=1 (linear model) and typical B₀-adjusted values of β. Χ² depicts goodness-of-fit. Data (mean±SEM) averaged across subjects for each magnet field strength (B₀).

B0(T)	PETO2(mmHg)		Venous oxygenation (Yv)		MR parameters for GM mask
	Baseline	Peak	Baseline	Peak	Baseline R*2GM (s−1)	Gradient (A) of ΔR*2GM v. (1−Yv) linear fit (Eq. (3)) (s−1)	Χ2 for nonlinear fit using B0-corrected β values (Eq. (4))	Χ2 for nonlinear 3 parameter fit (Eq. (4))
1.5	115±3	482±11	0.600±0.001	0.670±0.002	12.7±0.2	4.1±0.4 (χ2=6.4±2.0†)	χ2=6.4±2.0†	χ2=6. 4±2.0†
3	109±3	485±9	0.600±0.001	0.680±0.001	19.5±0.5	3.9±0.3 (χ2=4.3±1.1†)	χ2=4.3±1.1†	χ2=4.2±1.8†
7	119±2	490±13	0.600±0.001	0.670±0.003	33.2±0.7	13.2±2.0 (χ2=4.7±1.8†)	χ2=4.7±1.8†	χ2=4.6±1.8†

^†p<0.01.