Comparison of Maximum and Minimum Counts and Ratios for Structures from Clinical Database with Those from Phantom*
| Parameter | Clinical minimum–maximum (phantom) | Clinical mean (95% CI) | P (mean vs. phantom) |
|---|---|---|---|
| Liver counts/pixel | 135.6−365.6 (212.8) | 230.3 (112.7−348.0) | 0.70 |
| IVC counts/pixel | 118.8−247.6 (167.2) | 164.7 (96.4−233.0) | 0.92 |
| Background counts/pixel | 39.8−122.0 (70.0) | 72.8 (25.9−119.8) | 0.87 |
| Liver-to-IVC ratio | 1.0−1.9 (1.3) | 1.40 (0.95−1.86) | 0.56 |
| Liver-to-background ratio | 2.6−4.8 (3.0) | 3.38 (2.26−4.51) | 0.40 |
| IVC-to-background ratio | 1.6−3.1 (2.4) | 2.47 (1.78−3.16) | 0.80 |
↵* All phantom parameters fell within clinical range.