70 kVp (n = 20) | 120 kVp (n = 20) | P Value* | |
---|---|---|---|
CTDIvol(mGy) | 7.27 ± 0.93 | 10.79 ± 0.86 | <0.001 |
Scan length (cm) | 18.32 ± 3.29 | 19.05 ± 1.88 | 0.74 |
DLP (mGy*cm) | 144.23 ± 29.90 | 224.60 ± 35.15 | <0.001 |
Eff dose (mSv) | 0.85 ± 0.18 | 1.33 ± 0.21 | <0.001 |
Note:—DLP is calculated by multiplying the CTDIvol by the scan length in the z-axis. Eff dose indicates effective radiation dose, calculated by multiplying the DLP by mSv*mGy-1*cm-1.11
↵* P values comparing 70-kVp and 120-kVp scans.