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Table 2 SULmax, SULmean, SULpeak for normal tissue and the prostate tumor (mean ± range). Next the absolute difference and the relative difference between scan 1 and scan 2. The within-subject coefficient of variation (wCV) in %, the coefficient of repeatability (RC), both in % as in absolute SUL values

From: Day-to-day variability of [68Ga]Ga-PSMA-11 accumulation in primary prostate cancer: effects on tracer uptake and visual interpretation

Organ Metric Average SUL Difference in SUL scan 2–1 Relative difference (%) wCV (%) RC (SUL) RC (%)
Parotid Gland SULmax 15.1 ± 3.3 (10.1, 23.1) 0.5 ± 1.2 (− 1.4, 2.6) 4.1 ± 9.0 (− 9, 21) 11.3 2.3 17.0
SULmean 9.6 ± 1.9 (5.8,13.7) 0.2 ± 1.2 (− 1.9, 2.3) 3.9 ± 11.9 (− 15, 26) 8.4 2.3 23.4
Aortic arch SULmax 1.8 ± 0.3 (1.0, 2.5) 0.0 ± 0.3 (− 0.6, 0.8)  − 0.2 ± 18.6 (− 31, 38) 13.2 0.6 36.5
SULmean 0.9 ± 0.1 (0.5, 1.2) 0.0 ± 0.1 (− 0.3, 0.1) 0.2 ± 12.2 (− 29, 25) 9.6 0.2 26.6
Liver SULmax 7.2 ± 1.5 (5.0, 9.6)  − 0.5 ± 1.3 (− 5.5, 1.3)  − 7.1 ± 15.8 (− 63, 21) 6.5 1.4 31.1
SULmean 3.7 ± 0.8 (2.3, 5.5) 0.3 ± 0.4 (− 1.1, 0.6)  − 3.4 ± 9.2 (− 25, 13) 11.2 0.8 17.9
Kidney SULmax 42.5 ± 6.9 (27.1, 56.7) 0.3 ± 4.5 (− 6.4, 9.4) 1.0 ± 11.3 (− 17, 29) 8.6 8.5 22.2
SULmean 19.5 ± 3.8 (11.6, 28.1)  − 0.5 ± 2.4 (− 5.2, 3.4)  − 2.4 ± 15.0 (− 25, 13) 8.0 4.7 23.9
A. Abdominalis SULmax 1.9 ± 0.4 (1.2, 2.8) 0.0 ± 0.4 (− 0.6, 0.8) 2.6 ± 18.2 (− 28, 44) 12.9 0.7 35.6
SULmean 0.9 ± 0.2 (0.4, 1.1) 0.0 ± 0.1 (− 0.2, 0.3) 1.8 ± 14.3 (− 29, 35) 10.7 0.3 29.7
Bone SULmax 1.5 ± 0.4 (0.9, 2.5) 0.1 ± 0.4 (− 0.7, 0.8) 3.1 ± 25.2 (− 48, 45) 17.8 0.8 49.4
SULmean 0.5 ± 0.2 (0.3, 0.9) 0.0 ± 0.1 (− 0.2, 0.1)  − 6.0 ± 14.0 (− 33, 17) 10.0 0.2 27.7
Bladder SULmax 12.5 ± 8.9 (3.3, 43.7)  − 1.6 ± 8.9 (− 40.2, 12.4) 2.0 ± 58.1 (− 112, 113) 41.1 17.2 113.8
SULmean 7.7 ± 5.2 (1.9, 32.2)  − 0.3 ± 6.4 (− 7.7, 22.6) 9.2 ± 62.6 (− 108, 128) 43.9 12.3 121.8
Prostate tumor SULmax 10.7 ± 7.3 (3.1, 32.3)  − 0.2 ± 1.1 (− 2.2, 2.5)  − 0.5 ± 11.2 (− 18, 21) 7.9 2.2 21.9
SULpeak 6.2 ± 3.5 (2.6, 13.3) 0.0 ± 0.6 (− 1.2, 1.4) 1.2 ± 9.2 (− 15, 19) 6.5 1.1 18.1
TBR SULmax 5.9 ± 4.2 (1.7, 17.8)  − 0.2 ± 1.2 (− 3.3, 1.9)  − 1.0 ± 19.7 (− 43, 42) 13.8 2.4 38.4
SULpeak 5.4 ± 1.3 (2.1, 12.5) 0.2 ± 0.6 (− 1.0, 2.4) 5.7 ± 17.1 (− 19.5, 27.6) 9.9 1.6 27.5
  1. Values are displayed as mean ± standard deviation (min, max). Average SUL of each site was calculated as mean over all subjects and all scans. Difference SUL and the relative difference are calculated as the group average of the difference