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Homogeneous model accurately estimates relative change in BFi (rBFi) when scalp and brain flow change by the same fractional amount. Color map of the error in estimated rBFi obtained with the homogenous model as a function of true rCBFi and rSBFi. Missing data points are due to the limited combinations of CBFi and SBFi that were simulated. Dotted line denotes the line of unity where rCBFi = rSBFi
