Fig. 6

Correlation between MPO2 and GPO2 in the tumor after applying the nearest-neighbor algorithm for the 50-µm voxel data. a The scatter plot and linear regression fit are displayed after applying the nearest neighbor algorithm (see Fig. 5a for comparison). b The distribution of r²-values as a function of voxel size. The blue stars are from the r²-values in Fig. 5 and the red star is after applying the nearest neighbor algorithm to the 50-μm voxel data