Fig. 1.

Bland–Altman plot shows a comparison of the magnitude of the SpO₂ nadirs for the calibration and imaging doses for all three subject groups (controls with half-doses of hyperpolarized gas, controls with full doses, and children with cystic fibrosis, who all received full doses. Across all subjects and all doses, the mean difference in SpO₂ nadir for the imaging and calibration doses was −2.7±7.7% (solid line; magnitude is plotted). Note the 95% confidence intervals (dashed lines). CF cystic fibrosis