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Attenuation value in head CT: Adaptive Statistical Iterative Reconstruction (ASiR) compared to filtered back projection (FBP)
| ASiR | FBP | p-value | |
|---|---|---|---|
| Cerebrum | |||
| Attenuation GM | 32.6 ± 3.0 | 32.5 ± 2.4 | NS |
| Attenuation WM | 23.8 ± 1.7 | 24.1 ± 1.8 | NS |
| Posterior fossa | |||
| Attenuation GM | 39.2 ± 2.7 | 38.6 ± 3.2 | NS |
| Attenuation WM | 26.2 ± 2.3 | 27.5 ± 2.8 | NS |
| Fourth ventricle | |||
| Attenuation CSF | 3.9 ± 1.8 | 5.4 ± 2.6 | NS |
