We compared two MRI methods to image oxygen extraction fraction (OEF): QUO2 and quantitative susceptibility mapping (QSM).
OEF values from QUO2 with three gas challenges correlated with OEF values from QSM in cerebral veins.
QUO2 measurements of OEF depend on accurate measurement of the hyperoxic BOLD signal.
Blood flow changes during visual stimulation correlated with baseline OEF by both methods.