Five-Point Qualitative Posttherapy Assessment Scoring System (Hopkins Criteria) for Head and Neck PET/CT
| Score | 18F-FDG uptake pattern | Response category |
| 1 | 18F-FDG uptake at the primary site and nodes less than IJV. | Complete metabolic response |
| 2 | Focal 18F-FDG uptake at the primary site and nodes greater than IJV but less than liver. | Likely complete metabolic response |
| 3 | Diffuse 18F-FDG uptake at the primary site or nodes is greater than IJV or liver. | Likely postradiation inflammation |
| 4 | Focal 18F-FDG uptake at the primary site or nodes greater than liver. | Likely residual tumor |
| 5 | Focal and intense 18F-FDG uptake at the primary site or nodes. | Residual tumor |
Scores 1, 2, and 3, which represent complete metabolic response, likely complete metabolic response, and likely postradiation inflammation, respectively, were considered negative for tumor. Scores 4 and 5, which represent likely residual tumor and residual tumor, respectively, were considered positive for tumor. New lesion would be considered as progressive disease.