Fig. 5

Regression plots comparing CMR measurements of O2 saturation against reference O2 saturation by catheterization. The regression plots indicate the linear relationship between CMR measures of O2 saturation (%, measured in the right ventricle) estimated from a global calibration, b unconstrained optimization, c fixed nuisance parameter, and d constrained nuisance parameter solutions to the L-M model, with the reference O2 saturation by catheter sampling (measured in the right atrium). The regression line is depicted by the solid black line. Also shown are the 95% confidence band (within the red lines) and 95% prediction band (within the orange lines). Note that the y-axis in plot (b) is on a different scale