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| CEUS | SMI | Total | χ2 | P | |||
|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | ||||
| Grade 0 | 4 | 0 | 0 | 0 | 4 | 1.333 | 0.721 |
| Grade 1 | 2 | 17 | 0 | 0 | 19 | ||
| Grade 2 | 0 | 3 | 23 | 1 | 27 | ||
| Grade 3 | 0 | 0 | 3 | 10 | 13 | ||
| Total | 6 | 20 | 26 | 11 | 63 | ||
SV, synovial vascularity; RA, rheumatoid arthritis; SMI, superb microvascular imaging; CEUS, contrast-enhanced ultrasound.
