Table 3.
Attenuation and CNR of the best phase for different vessel regions.
| Protocol A Low CM Volume | Protocol B Low CM Volume | Protocol C High CM Volume | Protocol D High CM Volume | P-value* High vs low CM Volume | |
|---|---|---|---|---|---|
| Attenuation (HU) | |||||
| Artery | 471 ± 66 | 435 ± 77 | 561 ± 69 | 534 ± 102 | P < 0.0017 |
| Shunt | 469 ± 65 | 432 ± 75 | 557 ± 69 | 528 ± 103 | P < 0.0023 |
| Vein | 204 ± 83 | 224 ± 55 | 345 ± 68 | 325 ± 91 | P < 0.0001 |
| Distal artery | 380 ± 68 | 364 ± 61 | 461 ± 69 | 425 ± 108 | P < 0.0071 |
| CNR | |||||
| Artery | 13 ± 3 | 10 ± 2 | 14 ± 3 | 14 ± 4 | P < 0.0239 |
| Shunt | 13 ± 3 | 10 ± 2 | 14 ± 3 | 14 ± 3 | P < 0.0223 |
| Vein | 5 ± 3 | 4 ± 2 | 8 ± 2 | 8 ± 3 | P < 0.0002 |
| Distal artery | 10 ± 2 | 8 ± 2 | 11 ± 2 | 10 ± 4 | P < 0.0468 |
Note – CNR = contrast-to-noise ratio; CM = contrast media.