Scoring Criteria for Image Quality Assessment
| QS | Rating | Description |
|---|---|---|
| 1 | Nondiagnostic | Excessive noise or artifacts; delineation of tumor and background uptake mostly impossible |
| 2 | Barely diagnostic | Substantial noise and artifacts; delineation of tumor and background uptake difficult but possible |
| 3 | Fairly diagnostic | Somewhat noisy and artifacts that interfere with reading; delineation of tumor and background uptake feasible but not satisfactory |
| 4 | Diagnostically excellent | No interfering noise or artifacts; delineation of tumor and background uptake satisfactory |