Fig. 2.

Venous and parenchymal ROIs demonstrate different hemodynamics in response to CA. (a) Images of blood flow (SFI) and deoxyhemoglobin concentration (ctHb), measured from the rat brain using LSI and SFDI, respectively. ROIs over the parenchyma (P) and large vein (V) are labeled in the ctHb image. (b) ctHb (black dots) increases in these ROIs during the initial minute of asphyxia. The sigmoidal fit (red line) and linear fit (blue circles) to the measured data are used to calculate the parameter $\alpha$ in Eq. (6). (c) The rate of change of tissue ctHb (dctHb/dt) during the initial minute of asphyxia is higher in the venous ROI than parenchyma ROI.