Summary of DSA and 4D-CE-MRA findings
| 4D-CE-MRA | Interobserver Agreement | DSA | 4D-CE-MRAa | Intermodality Agreement | ||
|---|---|---|---|---|---|---|
| Observer 1 | Observer 2 | |||||
| Main feeders | ||||||
| IMA | 3 | 3 | 4 | 3 | ||
| Oph A | 2 | 3 | 3 | 2 | ||
| Facial A | 2 | 1 | 2 | 1 | ||
| Occipital A | 1 | 1 | 0 | 1 | ||
| PCA | 0 | 1 | 6/15 (40%) | 1 | 1 | 8/15 (53%) |
| ACA | 0 | 2 | 2 | 1 | ||
| Cerebellar A | 0 | 0 | 1 | 0 | ||
| ICA | 0 | 1 | 1 | 0 | ||
| Other feeders | 7 | 3 | 1 | 6 | ||
| Tumor stainb | ||||||
| Grade 0 | 0 | 0 | 0 | 0 | ||
| Grade 1 | 8 | 7 | 14/15 (93%) | 6 | 8 | 13/15 (87%) |
| Grade 2 | 7 | 8 | 9 | 7 | ||
Note:—IMA indicates internal maxillary artery; Oph A, ophthalmic artery; Facial A, facial artery; Occipital A, occipital artery; PCA, posterior cerebral artery; ACA, anterior cerebral artery; Cerebellar A, cerebellar artery; ICA, internal carotid artery.
↵a Consensus reading of the 2 observers.
↵b The degree of tumor stain was classified as grade 0, not visible; grade 1, visible only after the late arterial phase; and grade 2, visible from the early arterial phase.