Table 2 Mean-, max-, and min-percentages of contrast recovery, background variability, and lung residual for the 4:1 sphere-to-background ratio for three sequential measurements of IEC image quality phantom
Sphere diameter(mm) | 10 | 13 | 17 | 22 | 28 | 37 | Lung residual | |
|---|---|---|---|---|---|---|---|---|
Contrast recovery | Mean | 46.5% | 76.2% | 79.3% | 82.8% | 82.1% | 83.9% | Â |
Max | 48.5% | 79.5% | 83.0% | 85.0% | 84.9% | 84.5% | ||
Min | 43.4% | 72.7% | 76.4% | 80.8% | 80.4% | 82.8% | ||
Background variability | Mean | 6.4% | 5.5% | 4.7% | 4.0% | 3.3% | 2.5% | 3.1% |
Max | 6.9% | 6.0% | 5.1% | 4.5% | 3.7% | 2.6% | 3.5% | |
Min | 5.7% | 5.0% | 4.3% | 3.6% | 2.9% | 2.3% | 2.7% | |