Attenuation values (HU) of diluted blood, blood-iodine mixtures, and diluted iodine on SDCT conventional and VNC imagesa
| Conventional (HU) | VNC (HU) | R-VNC (%) | ||||
|---|---|---|---|---|---|---|
| Mean | 95% CI | Mean | 95% CI | Mean | 95% CI | |
| 100% blood–0% iodine | 39.1 | 31.5–46.7 | 39.1 | 31.5–46.7 | 99.6 | 98.8–100.4 |
| 67% blood–33% iodine | 49.5 | 42.8–56.2 | 40.4 | 35.9–44.9 | 82.8 | 79.5–86.1 |
| 50% blood–50% iodine | 49.2 | 41.7–56.7 | 32.6 | 28.6–36.6 | 67.6 | 64.4–70.9 |
| 33% blood–67% iodine | 49.4 | 42.2–56.6 | 26.0 | 23.3–28.6 | 54.3 | 50.6–58.0 |
| 0% blood –100% iodine | 129.5 | 99.4–159.6 | 14.5 | 13.4–15.6 | 15.7 | 12.4–19.1 |
↵a R-VNC attenuation (%) was calculated by comparing VNC attenuation with the attenuation on conventional CT for all investigated categories.