Grading of patent DAVFs (Cognard) on TR 3D MRA
| Correct Grading (%) | Weighted κ Values | 95% Confidence Intervals (%) | |
|---|---|---|---|
| Reader 1 vs. DSA | 11/13 (85%) | 0.93 | 52%–100% |
| Reader 2 vs. DSA | 10/13 (77%) | 0.86 | 40%–100% |
| Reader 1 vs. Reader 2 | 10/13 (77%) | 0.86 | 40%–100% |
Note:—DAVF indicates dural arteriovenous fistula; TR 3D MRA, time-resolved 3D MR angiography. Grading of DAVFs was performed according to the Cognard classification (6 types). All examinations that showed angiographically proved patent fistulas were included in this evaluation (n = 13). The interobserver agreement was determined by weighted κ values including 95% confidence intervals.