FIG 4. Dynamic CT measurements plotted against microsphere measurements of regional CBF (mL/min/100 g) for 54 ROIs (18 ROIs for each tumor, peritumor, and normal tissue) in nine rabbits with brain tumor. A strong correlation was found between these two sets of measurements (r = 0.847). The slope of the regression line (0.99 ± 0.03, P < .001) was not significantly different from unity