Table 2.
Radiation dose in head CT: Adaptive Statistical Iterative Reconstruction (ASiR) compared to filtered back projection (FBP)
| ASiR | FBP | ASiR vs. FBP | p-value | |
|---|---|---|---|---|
| DLP (mGy*cm) | ||||
| Overall | 654.5 ± 77.0 | 804.2 ± 52.3 | -19 % | <0.0001 |
| Cerebrum | 390.3 ± 75.5 | 560.6 ± 51.8 | -30 % | <0.0001 |
| Posterior fossa | 264.2 ± 31.9 | 243.6 ± 5.5 | +8 % | <0.0001 |
| CTDIvol (mGy) | ||||
| Cerebrum | 36.2 ± 4.5 | 51.5 ± 3.0 | -30 % | <0.0001 |
| Posterior fossa | 59.7 ± 3.7 | 55.9 ± 2.5 | +7 % | <0.0001 |
| Scan range (cm) | 14.3 ± 1.1 | 14.6 ± 1.1 | +2 % | NS |
DLP dose-length product, CTDI vol volumetric CT dose index