Counts of cases excluded due to technical failures and the presence of ipsilateral extracranial carotid artery stenosis, derived from DSA dataa
| No. of Cases | Total | CTP before CTA | CTA before CTP | CTP with Flank Effect |
|---|---|---|---|---|
| Total | 2074 | 393 | 1628 | 53 |
| Excluded due to technical issues | 94 (4.5%) | 25 (6.3%) | 65 (4.0%) | 4 (7.5%) |
| Finally used in evaluation | 1980 | 368 | 1563 | 49 |
| With subsequent DSA | 387 (20%) | 76 (21%) | 300 (19%) | 11 (22%) |
| With ICA stenosis identified in DSA | 86 (22%) | 21 (28%) | 62 (21%) | 3 (27%) |
↵a Data are the number of cases (percentage). Relative counts of technical failures and the presence of higher-grade carotid stenosis are similar in all groups