Table 1.
Objective image quality assessment of head CT: Adaptive Statistical Iterative Reconstruction (ASiR) compared to filtered back projection (FBP)
| ASiR | FBP | ASiR vs.FBP | p-value | |
|---|---|---|---|---|
| Cerebrum | ||||
| SNR GM | 11.6 ± 2.8 | 9.7 ± 1.9 | +20 % | NS |
| SNR WM | 8.7 ± 2.5 | 7.3 ± 1.7 | +19 % | NS |
| CNR | 0.12 ± 0.09 | 0.08 ± 0.05 | +50 % | NS |
| Posterior fossa | ||||
| SNR GM | 13.5 ± 3.6 | 9.9 ± 2.5 | +36 % | <0.0001 |
| SNR WM | 9.5 ± 2.9 | 7.1 ± 1.7 | +34 % | <0.0001 |
| CNR | 0.17 ± 0.10 | 0.07 ± 0.04 | +142 % | <0.0001 |
| Fourth ventricle | ||||
| SNR | 1.7 ± 0.8 | 1.4 ± 0.7 | +21 % | NS |
Values are given as mean ± SD
SNR signal-to-noise ratio, CNR contrast-to-noise ratio, GM grey matter, WM white matter