Table 3. Attenuation, image noise, SNR, and CNR in anatomic regions of interest of aortic branches.
| Item | Low-iodine group (n = 50) | High-iodine group (n = 50) | t-value | P-value |
|---|---|---|---|---|
| Attenuation | ||||
| Brachiocephalic trunk | 312.61 ± 60.76 | 340.86 ± 80.89 | -1.975 | 0.051 |
| Left common carotid artery | 328.29 ± 74.33 | 358.89 ± 84.37 | -1.925 | 0.057 |
| Left subclavian artery | 328.31 ± 63.25 | 358.81 ± 80.89 | -1.963 | 0.053 |
| Celiac trunk | 290.03 ± 70.19 | 300.27 ± 75.26 | -0.704 | 0.483 |
| Superior mesenteric artery | 302.81 ± 63.26 | 308.56 ± 69.60 | -0.432 | 0.667 |
| Right renal artery | 282.68 ± 62.96 | 283.19 ± 71.71 | -0.038 | 0.969 |
| Left renal artery | 280.21 ± 73.03 | 285.29 ± 78.39 | -0.335 | 0.738 |
| Left common iliac artery | 281.02 ± 79.45 | 290.69 ± 64.48 | -0.668 | 0.506 |
| Right common iliac artery | 286.41 ± 83.38 | 295.41 ± 69.57 | -0.585- | 0.560 |
| Image noise | ||||
| Brachiocephalic trunk | 19.73 ± 5.72 | 23.46 ± 5.64 | -3.296 | 0.001 |
| Left common carotid artery | 20.97 ± 12.82 | 25.24 ± 6.96 | -2.070 | 0.041 |
| Left subclavian artery | 19.05 ± 5.06 | 25.61 ± 12.23 | -3.509 | 0.001 |
| Celiac trunk | 31.86 ± 9.04 | 38.06 ± 11.56 | -2.991 | 0.004 |
| Superior mesenteric artery | 30.37 ± 8.49 | 38.29 ± 14.61 | -3.310 | 0.001 |
| Right renal artery | 18.90 ± 5.21 | 23.00 ± 5.00 | -2.062 | 0.042 |
| Left renal artery | 36.30 ± 12.64 | 41.98 ± 12.76 | -2.235 | 0.028 |
| Left common iliac artery | 26.66 ± 5.99 | 30.09 ± 7.82 | -2.462 | 0.016 |
| Right common iliac artery | 25.66 ± 6.44 | 30.18 ± 7.73 | -3.177 | 0.002 |
| SNR | ||||
| Brachiocephalic trunk | 15.26 ± 4.71 | 14.25 ± 5.48 | 0.994 | 0.332 |
| Left common carotid artery | 16.27 ± 5.87 | 14.13 ± 5.45 | 1.896 | 0.061 |
| Left subclavian artery | 16.64 ± 5.32 | 14.56 ± 5.75 | 1.874 | 0.064 |
| Celiac trunk | 7.93 ± 3.22 | 7.18 ± 3.17 | 1.173 | 0.244 |
| Superior mesenteric artery | 8.74 ± 2.75 | 8.09 ± 6.71 | 0.632 | 0.529 |
| Right renal artery | 7.99 ± 6.43 | 6.14 ± 2.23 | 1.928 | 0.057 |
| Left renal artery | 6.83 ± 3.11 | 5.86 ± 1.69 | 1.945 | 0.055 |
| Left common iliac artery | 9.34 ± 3.44 | 8.87 ± 3.13 | 0.715 | 0.476 |
| Right common iliac artery | 10.04 ± 4.17 | 9.03 ± 3.72 | 1.273 | 0.206 |
| CNR | ||||
| Brachiocephalic trunk | 9.67 ± 3.42 | 10.24 ± 3.18 | -0.853 | 0.396 |
| Left common carotid artery | 10.41 ± 3.94 | 10.87 ± 3.31 | -0.640 | 0.524 |
| Left subclavian artery | 10.28 ± 3.89 | 10.83 ± 3.28 | -0.764 | 0.447 |
| Celiac trunk | 8.93 ± 3.62 | 8.04 ± 2.92 | 1.349 | 0.181 |
| Superior mesenteric artery | 8.93 ± 3.62 | 8.04 ± 2.92 | 1.814 | 0.073 |
| Right renal artery | 8.91 ± 3.53 | 7.80 ± 2.64 | 1.776 | 0.079 |
| Left renal artery | 8.79 ± 3.39 | 7.96 ± 3.31 | 1.245 | 0.216 |
| Left common iliac artery | 8.50 ± 3.76 | 8.11 ± 3.11 | 0.558 | 0.578 |
| Right common iliac artery | 9.18 ± 4.15 | 8.16 ± 3.46 | 1.334 | 0.185 |
SNR, signal-to-noise ratio; CNR, contrast-to-noise ratio.