Contrast, Background Variability, and Average Lung Residual for 8:1 Sphere-to-Background Ratio on Vision, Directly Compared with Published Results from mCT Flow
| Contrast (%) | Background variability (%) | |||
| Sphere size (mm) | Vision | mCT Flow | Vision | mCT Flow |
| 10 | 86.8 | 41.9 | 6.0 | 6.3 |
| 13 | 77.2 | 63.1 | 5.0 | 5.4 |
| 17 | 85.0 | 68.1 | 3.9 | 4.4 |
| 22 | 89.8 | 76.6 | 3.3 | 3.6 |
| 28 | 87.4 | 71.3 | 3.0 | 3.0 |
| 37 | 89.6 | 77.7 | 2.2 | 2.4 |
| Average lung residual (%) | 3.5 | 12.1 | ||
mCT Flow measurements include effect of low-resolution matrix and postreconstruction 3-mm gaussian filter (12).