Fig. 7

Normal brain tissue hypoxic fraction (HF) correlation of MPO2 and GPO2 in voxel sizes at 50 and 100 µm plotted in subplot a and b. In each voxel size, four HFs (16–22 mmHg in 2 mmHg increment) is used for linear regression analysis. The linear regression is plotted in red dash line; the result of linear regression and the Rsq values are displayed in top left corner