Comparison of carotid opacification between 256-detector and 64-detector CT
| Description | No. of Cases (Incidence) on 256-Section CTA | No. of Cases (Incidence) on 64-Section CTA | P Value (Fisher Exact Test) | |
|---|---|---|---|---|
| Sufficient segments (qualitative) | Segment graded as sufficient if graded as adequate, good, or excellent | 387/391 (99.0%) | 376/390 (96.4%) | NS |
| Sufficient segments (quantitative) | Segment graded as sufficient if HU were >150 | 381/392 (97.4%) | 365/390 (93.6%) | NS |
| Sufficient segments (arteriovenous contrast) | Segment graded as sufficient if artery >50 HU above comparable venous segment | 376/391 (96.2%) | 361/390 (92.6%) | NS |
Note:—NS indicates not significant.