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| Concentration | Conventional CT |
K-edge Subtraction Imaging (Image Domain) | K-edge Imaging (Projection Domain) | CNR Compared with Image Domain Subtraction | CNR Compared with Conventional CT |
|---|---|---|---|---|---|
| 0.1% | 0.0296 | 0.4832 | 1.032 | 2.14 | 34.9 |
| 0.2% | 0.4651 | 1.2479 | 1.8194 | 1.46 | 3.91 |
| 0.5% | 1.9994 | 3.5586 | 3.9775 | 1.12 | 1.99 |
