Image Quality Results for 4:1 and 8:1 Sphere-to-Background Ratios for Vereos PET/CT System (NEMA NU2-2012)
| Contrast recovery | Background variability | |||
| Sphere diameter (mm) | 4:1 | 8:1 | 4:1 | 8:1 |
| 10 | 54.3 (48.6–61.5) | 54.4 (53.2–55.4) | 8.8 (7.7–10.2) | 9.3 (8.9–9.8) |
| 13 | 75.3 (68.6–78.8) | 75.9 (74.3–79.0) | 7.2 (6.2–8.3) | 7.5 (7.1–7.9) |
| 17 | 80.4 (78.5–83.1) | 81.6 (80.0–83.4) | 5.7 (5.0–6.3) | 5.7 (5.2–6.1) |
| 22 | 83.9 (80.7–88.3) | 86.5 (86.2–87.1) | 4.4 (4.1–4.7) | 4.3 (3.9–4.8) |
| 28 | 81.4 (08.2–82.8) | 82.5 (82.1–83.3) | 3.3 (3.1–3.6) | 3.5 (3.2–3.9) |
| 37 | 87.0 (86.8–87.3) | 85.8 (86.1–85.4) | 2.5 (2.5–2.3) | 2.6 (2.1–2.9) |
| Lung residual | 6.35 | 6.36 | ||
Data are mean percentages followed by ranges in parentheses.