Table 1 Image findings and degree of synovitis in qualitative analysis on contrast-enhanced and diffusion-weighted images
Category | Image findings | Degree of synovitis |
|---|---|---|
0 | non-diagnostic image quality | – |
1 | no signs of synovitis | No manifest synovitis |
2 | minimal circumscriptive or linear signal increase, not qualifying for synovitis | Mild synovial irritation |
3 | synovitis present, defined as marked linear signal increase of the synovial layer with < 2 mm in thickness | Manifest synovitis/arthritis |
4 | synovitis plus circumscriptive or diffuse synovial thickening ≥2 mm | Manifest synovitis/arthritis |