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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% | 0.0355 | 0.4277 | 0.9506 | 2.22 | 26.8 |
| 0.2% | 0.5379 | 1.2177 | 1.6732 | 1.37 | 3.11 |
| 0.5% | 1.9022 | 3.3491 | 3.5914 | 1.07 | 1.89 |
