CTDIw for Various Scanning Parameters and Phantoms
| CT parameters | CTDIw for abdomen phantom (mGy) | CTDIw for head phantom (mGy) |
| 120 kV; 1 mA; axial scanning; collimation, 20 mm; slice thickness, 5 mm | — | 2.01 |
| 140 kV; 2.5 mA; axial scanning; collimation, 20 mm; slice thickness, 5 mm | 5.42 | 7.23 |