Video 2.

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Shows the dynamics of hemoglobin saturation and tumor oxygenation over an 1-h time period with oxygen tension shown as a 3-D projection along the z-axis, and hemoglobin saturation shown on a blue → red color scale identical to that in Fig. 3. Tissue oxygenation can be seen to be a dynamic process with constant variability throughout the time period. Hemoglobin saturation tracks well with changes in tissue oxygenation, with reddening vessels coinciding with increased oxygen tension. (QuickTime, 3.4 MB).