Relative differences between replicate tumor SUV measurements made under 4 different conditions: SUVmax, 128 × 128 image matrix (A); SUVmax, 256 × 256 image matrix (B); SUVpeak, 128 × 128 image matrix (C); and SUVpeak, 256 × 256 image matrix (D). Relative difference (d) is defined as difference between 2 measurements, expressed as percentage of baseline measurement. Dashed lines indicate 95% limits of agreement and are equal to mean of d ± 1.96 × SD of d.