Table 2:

Comparison of CTDIvol, DLP, scan length, and effective dose between 70-kVp and 120-kVp CT scans

70 kVp (n = 20)120 kVp (n = 20)P Value*
CTDIvol(mGy)7.27 ± 0.9310.79 ± 0.86<0.001
Scan length (cm)18.32 ± 3.2919.05 ± 1.880.74
DLP (mGy*cm)144.23 ± 29.90224.60 ± 35.15<0.001
Eff dose (mSv)0.85 ± 0.181.33 ± 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.