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Table 2: 
Counts of cases excluded due to technical failures and the presence of ipsilateral extracranial carotid artery stenosis, derived from DSA dataa
No. of CasesTotalCTP before CTACTA before CTPCTP with Flank Effect
Total2074393162853
Excluded due to technical issues94 (4.5%)25 (6.3%)65 (4.0%)4 (7.5%)
Finally used in evaluation1980368156349
With subsequent DSA387 (20%)76 (21%)300 (19%)11 (22%)
With ICA stenosis identified in DSA86 (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