Table 4:
Statistical differences (P values) between the regular- and lower-dose CT groups
| Radiation Dose | Reconstruction Technique | Quantitative Measurements (P values) |
||
|---|---|---|---|---|
| GM-SNR | WM-SNR | GM-WM CNR | ||
| Regular (175 mAs) | 100% FBP | Control group | ||
| 100% FBP | .003a | .003a | .4 | |
| 20% ASIR + 80% FBP | .649 | .541 | 1 | |
| Lower-Dose (140 mAs) | 40% ASIR + 60% FBP | .302 | .668 | .03a |
| 60% ASIR + 40% FBP | <.0001a | <.0001a | <.0001a | |
| 80% ASIR + 20% FBP | <.0001a | <.0001a | <.0001a | |
| 100% ASIR | <.0001a | <.0001a | <.0001a | |
a
Statistical significance between the lower-dose (with different ASIR/FBP levels) and regular-dose groups.