Qualitative image noise assessment and interpretability
| IQ1 | IQ2 | IQ3 | Mode | κ | Neck Visualization | |
|---|---|---|---|---|---|---|
| CCTA | 14/25 (56%) | 11/25 (44%) | 0/25 (0%) | 0 | 0.34 | 11/25 (44%) |
| 50-keV CTA | 3/25 (12%) | 16/25 (64%) | 6/25 (24%) | 1 | 0.23 | 18/25 (72%) |
| 70-keV CTA | 5/25 (20%) | 16/25 (64%) | 4/25 (16%) | 1 | 0.27 | 20/25 (80%) |
| IM-DECTA | 0/25 (0%) | 8/25 (32%) | 17/25 (68%) | 2 | 0.49 | 24/25 (96%) |
| MIP IM-DECTA | 0/25 (0%) | 6/25 (24%) | 19/25 (76%) | 2 | 0.58 | 24/25 (96%) |
Note:—Qualitative image noise assessment based on Likert-style scale reader scores for each CTA series, with interreader agreement assessed by Cohen κ and reported neck visualization for each series. All series demonstrated a significant improvement in neck visualization over reference CCTA as assessed by the nonparameteric Kruskal-Wallis test.