FIGURE 4.  Rapid development of high T/B ratios (t/b ratio) after sstr imaging using Gluc-Lys([¹⁸F]FP)-TOCA PET. Plot shows mean target-to-background ratios of 37 tumors located in liver (error bars = 1 SD). Eighty percent of the maximum value was reached within 16 ± 9 min and 90% of maximum T/B ratio was reached within 34 ± 12 min. Solid circles denote development of tumor SUV over time, which reaches a plateau at 40 min. Solid triangles denote development of background SUV (liver) with mild decrease over time.