Grading Systems for Qualitative Image Analyses
| Parameter | Group | Characteristic |
| Overall image quality | 1 | Good |
| 2 | Moderate | |
| 3 | Poor | |
| 4 | Noninterpretable | |
| Nonspecific blood-pool activity | 1 | No |
| 2 | Slight; mainly in central vessels | |
| 3 | Moderate; also, in peripheral vessels | |
| Background uptake in bone/marrow | 1 | No |
| 2 | Slight (≤gluteal muscle*) | |
| 3 | Moderate (>gluteal muscle*) | |
| 4 | Focal spots | |
| Negative impact of biodistribution on clinical decision making | Yes | |
| No |
↵* SUV of background compared with that of gluteal muscle.