FIGURE 2. Graphs show relative distribution of radiotracers within major pathophysiologic compartments of tumor. (A) Comparison of mean counts per pixel from ¹⁸F-FDG and ¹⁴C-2DG in viable and necrotic regions. (B) Comparison of mean counts per pixel in hypoxic and normoxic regions, throughout time course described (n = 4 for each time point; error bars are 1 SD about mean).