Table 1.
Mean, peak variance, and dose for the images in Figure 5. The variance and dose are defined relative to the peak variance and dose for the abdomen scan with bowtie only. All non-ideal detectors operate at 5 * 106 s-1 mm-2. ∞ denotes analytically infinite variance, which occurs at the variance singularity in the paralyzable detector model.
| Dataset | Fluence Control | PCXD Model | Relative Mean Variance | Relative Peak Variance | Relative Dose |
|---|---|---|---|---|---|
| Thorax | Bowtie + TCM | Ideal | 26% | 79% | 29% |
| Thorax | Bowtie Only | Ideal | 28% | 79% | 24% |
| Thorax | Dynamic | Ideal | 62% | 79% | 14% |
| Thorax | Bowtie + TCM | Nonparalyzable | 37% | 91% | 29% |
| Thorax | Bowtie Only | Nonparalyzable | 40% | 92% | 24% |
| Thorax | Dynamic | Nonparalyzable | 76% | 94% | 14% |
| Thorax | Bowtie + TCM | Paralyzable | ∞ | ∞ | 29% |
| Thorax | Bowtie Only | Paralyzable | ∞ | ∞ | 24% |
| Thorax | Dynamic | Paralyzable | 87% | 104% | 14% |
| Thorax | Bowtie + TCM | Hybrid | 129% | 239% | 29% |
| Thorax | Bowtie Only | Hybrid | 124% | 256% | 24% |
| Thorax | Dynamic | Hybrid | 79% | 95% | 14% |
| Abdomen | Bowtie + TCM | Ideal | 47% | 100% | 96% |
| Abdomen | Bowtie Only | Ideal | 46% | 100% | 100% |
| Abdomen | Dynamic | Ideal | 83% | 100% | 61% |
| Abdomen | Bowtie + TCM | Nonparalyzable | 60% | 113% | 96% |
| Abdomen | Bowtie Only | Nonparalyzable | 58% | 113% | 100% |
| Abdomen | Dynamic | Nonparalyzable | 97% | 114% | 61% |
| Abdomen | Bowtie + TCM | Paralyzable | ∞ | ∞ | 100% |
| Abdomen | Bowtie Only | Paralyzable | ∞ | ∞ | 96% |
| Abdomen | Dynamic | Paralyzable | 104% | 120% | 59% |
| Abdomen | Bowtie + TCM | Hybrid | 77% | 151% | 96% |
| Abdomen | Bowtie Only | Hybrid | 75% | 160% | 100% |
| Abdomen | Dynamic | Hybrid | 99% | 116% | 61% |