MRI Intraobserver SDD† (SDD/maximum observed value) | CT Intraobserver SDD† (SDD/maximum observed value) | |||||||
---|---|---|---|---|---|---|---|---|
Reader | Radiologist | Rheumatologist 1 | Rheumatologist 2 | Mean SDD | Radiologist | Rheumatologist 1 | Rheumatologist 2 | Mean SDD |
MCP2–5 | 1.7 (0.28) | 1.0 (0.12) | 1.0 (0.20) | 1.2 | 1.8 (0.29) | 3.3 (0.37) | 3.1 (0.34) | 2.7 |
Wrist | 6.4 (0.11) | 7.1 (0.12) | 4.9 (0.08) | 6.1 | 7.1 (0.12) | 9.4 (0.16) | 8.3 (0.14) | 8.3 |
Total | 6.6 (0.12) | 7.3 (0.13) | 5.2 (0.09) | 6.4 | 8.1 (0.14) | 11.2 (0.17) | 10.4 (0.16) | 9.9 |
↵† SDD = ± 1.96•SD[ReadA–ReadB]. SDD: smallest detectable difference; MCP2-5: second to fifth metacarpophalangeal joints; MRI: magnetic resonance imaging; CT: computed tomography; JSN: joint space narrowing.