Table 1. Signal Abnormality Score in different masticator structures.
| Anatomy | SA Score | ||
| 0 | 1 | 2 | |
| Masticator Muscles | |||
| Medial pterygoid | |||
| Lateral Pterygoid | |||
| Masseter | Normal | T2 signal change | T2 signal change with abnormal enhancement |
| Temporalis | |||
| Masticator atrophy | Normal | Part of masticator muscle atrophy | All muscles atrophy |
| Temporomandibular Joint | |||
| Deformity | Normal | Mild | Severe |
| Ramus ORN | Normal | Signal change | Bone destruction |
| Other Structures | |||
| Perimasticator space | Normal | Inflammation change | Fibrosis |
| Parotid gland | Normal | Abnormal enhancement | Atrophy |
Abbreviation.
SA score = Signal Abnormality score; ORN = Osteoradionecrosis.