BOLD Imaging:Extravascular Contribution

?R2* = 4.3 ??(1-Y) ?B0 CBVl

?R2* = 0.04 {??(1-Y) ?B0}2 CBVs

(venules, larger vessels)

(smaller capillaries)

Ogawa et al., Biophys. J., 64:803-812, 1993

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