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Fig. 1D —Utility of color map in identifying tumor in 52-year-old man with diffuse chronic prostatitis (prostate-specific antigen level = 4.7 ng/mL, Gleason score = 7). Pixel-by-pixel pharmacokinetic analysis was performed in region of interest (ROI) enclosed by white curve. k_ep (reverse reflux rate constant between extracellular space and plasma) map overlaid on T2-weighted image localizes lesion to left anterior peripheral zone.