Contrast, Background Variability, and Average Lung Residual for 4:1 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 | 93.1 | 28.3 | 6.4 | 6.9 |
| 13 | 73.5 | 47.9 | 5.0 | 6.8 |
| 17 | 79.0 | 58.4 | 4.0 | 5.6 |
| 22 | 87.0 | 70.8 | 3.1 | 4.7 |
| 28 | 86.3 | 67.0 | 2.7 | 3.8 |
| 37 | 89.4 | 76.9 | 2.2 | 2.9 |
| Average lung residual (%) | 3.4 | 12.3 | ||
mCT Flow measurements include effect of low-resolution matrix and postreconstruction 3-mm gaussian filter (12).