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The RMSE, averaged CNR, and noise in the rods in Fig. 12.
| Annulus | Scan | ERMSE (HU) | Noise (HU) | CNR |
|---|---|---|---|---|
| No | Cone-beam | 116.0 | 15.7 | 16.9 |
| Fan-beam | ∕ | 16.7 | 19.8 | |
| Cu modulator | 26.1 | 21.5 | 18.5a | |
| Elliptical | Cone-beam | 298.7 | 35.3 | 5.0 |
| Fan-beam | 79.9 | 47.8 | 6.4 | |
| Cu modulator | 91.0 | 74.8 | 5.0a | |
| Circular | Cone-beam | 355.1 | 40.8 | 3.3 |
| Fan-beam | 106.1 | 62.4 | 4.4 | |
| Cu modulator | 103.3 | 105.9 | 3.3a |
To compensate for the attenuation of the modulator, the values are normalized to the same total patient dose.
