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| CEUS | SMI | Total | χ2 | P | |||
|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | ||||
| Grade 0 | 7 | 1 | 0 | 0 | 8 | 6.000 | 0.112 |
| Grade 1 | 3 | 19 | 2 | 0 | 24 | ||
| Grade 2 | 0 | 2 | 7 | 1 | 10 | ||
| Grade 3 | 0 | 0 | 2 | 4 | 6 | ||
| Total | 10 | 22 | 11 | 5 | 48 | ||
SV, synovial vascularity; RA, rheumatoid arthritis; CEUS, contrast-enhanced ultrasound; SMI, superb microvascular imaging.
