Table 3. CT attenuation and noise of Delayed-HIR, Dark-blood-HIR, and Dark-blood-DLR images.
| Parameters | n | Quantitative values | P | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Delayed-HIR (group 1) | Dark-blood-HIR (group 2) | Dark-blood-DLR (group 3) | All | 1 vs. 2 | 2 vs. 3 | 1 vs. 3 | |||
| Delayed-HIR (group 1) CT attenuation of vascular wall (HU) | |||||||||
| Brachiocephalic trunk | 31 | 62.4 ± 15.9 | 67.4 ± 18.5 | 74.1 ± 18.1 | < 0.001 | 0.094 | < 0.001 | < 0.001 | |
| Left subclavian artery | 34 | 57.7 ± 15.8 | 55.7 ± 20.3 | 72.8 ± 21.3 | < 0.001 | 0.876 | < 0.001 | < 0.001 | |
| Right subclavian artery | 19 | 50.0 ± 20.3 | 51.9 ± 21.4 | 64.9 ± 19.7 | < 0.001 | 1.000 | < 0.001 | 0.002 | |
| Left common carotid artery | 48 | 70.6 ± 20.4 | 68.5 ± 19.4 | 79.8 ± 17.6 | < 0.001 | 0.230 | < 0.001 | < 0.001 | |
| Right common carotid artery | 50 | 79.1 ± 17.9 | 72.0 ± 21.2 | 81.8 ± 21.0 | < 0.001 | < 0.001 | < 0.001 | 0.175 | |
| CT attenuation of lumen (HU) | |||||||||
| Brachiocephalic trunk | 31 | 100.1 ± 41.4 | -13.3 ± 46.7 | -29.4 ± 30.0 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Left subclavian artery | 34 | 120.9 ± 26.4 | -9.8 ± 38.5 | -37.1 ± 35.1 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Right subclavian artery | 19 | 113.1 ± 29.8 | -8.5 ± 53.1 | -21.4 ± 36.4 | < 0.001 | < 0.001 | < 0.001 | 0.002 | |
| Left common carotid artery | 48 | 132.8 ± 30.5 | -7.4 ± 46.6 | -34.7 ± 41.8 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Right common carotid artery | 50 | 134.1 ± 26.1 | -8.1 ± 47.4 | -26.2 ± 36.9 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |
| Image noise of vascular wall (HU) | |||||||||
| Brachiocephalic trunk | 31 | 30.0 ± 7.2 | 31.3 ± 11.3 | 29.4 ± 10.7 | 0.078 | 1.000 | 0.045 | 0.472 | |
| Left subclavian artery | 34 | 32.5 ± 6.9 | 33.9 ± 9.9 | 31.6 ± 9.4 | 0.187 | 1.000 | 0.160 | 0.640 | |
| Right subclavian artery | 19 | 39.6 ± 12.1 | 36.6 ± 13.3 | 30.4 ± 9.1 | < 0.001 | 0.219 | 0.021 | 0.002 | |
| Left common carotid artery | 48 | 22.7 ± 6.2 | 22.4 ± 7.4 | 23.9 ± 8.4 | 0.012 | 0.589 | 0.008 | 0.578 | |
| Right common carotid artery | 50 | 23.3 ± 6.2 | 21.8 ± 5.9 | 23.4 ± 7.4 | 0.003 | 0.020 | 0.004 | 1.000 | |
| Image noise of lumen (HU) | |||||||||
| Brachiocephalic trunk | 31 | 16.7 ± 5.4 | 17.4 ± 8.5 | 10.6 ± 4.2 | < 0.001 | 1.000 | < 0.001 | < 0.001 | |
| Left subclavian artery | 34 | 14.3 ± 7.2 | 14.5 ± 9.8 | 9.0 ± 5.5 | < 0.001 | 1.000 | < 0.001 | < 0.001 | |
| Right subclavian artery | 19 | 16.5 ± 9.2 | 16.5 ± 10.3 | 10.1 ± 6.8 | < 0.001 | 1.000 | < 0.001 | < 0.001 | |
| Left common carotid artery | 48 | 9.2 ± 3.9 | 7.2 ± 4.5 | 6.4 ± 5.3 | < 0.001 | < 0.001 | < 0.001 | 0.006 | |
| Right common carotid artery | 50 | 8.7 ± 4.0 | 7.3 ± 4.9 | 6.3 ± 4.3 | < 0.001 | 0.012 | < 0.001 | 0.006 | |
Data are mean ± standard deviation. The P-values for multiple pairwise comparisons were adjusted using Bonferroni method, and P < 0.05 indicates statistically significant difference.
CT = computed tomography, HIR = hybrid iterative reconstruction, DLR = deep learning reconstruction, HU = Hounsfield unit