Table 4. Comparisons of the CNRLVC and CNRVVC with CTDILVC and CTDIVVC for the three AP groups.
| Ages | 1-year-old AP | 5-year-old AP | 10-year-old AP |
|---|---|---|---|
| Parameter | |||
| LVC (kVp/mA) | 80/80 | 80/120 | 80/150 |
| VVC (kVp/mA) | 120/250 | 120/250 | 120/250 |
| CTDIvol (mGy) | |||
| CTDIVVC/CTDILVC | 42.54/4.22 | 42.54/6.33 | 42.54/7.91 |
| Times | 10.10 | 6.72 | 5.37 |
| Contrast-to-noise ratio (CNR) | |||
| CNRVVC/CNRLVC | 2.08/1.20 | 1.86/1.02 | 2.09/1.11 |
| Times | 1.73 | 1.82 | 1.88 |
Abbreviations: LVC, least voltage/current; VVC, Vendor-recommended voltage/current; CNRLVC and CNRVVC, the LVC-induced CNR and the VVC-induced CNR; CTDILVC and CTDIVVC, the LVC-induced CTDI and the VVC-induced CT