Table 3.
CTDIvol(32 cm) for four different tube potentials and a tube-current-time-product of 100 mAs. CTDIvol values for higher tube-current-time-products scale linearly. The small difference between the two systems is due to the different detector collimations used (EID, 32 × 1.2 mm; PCD, 32 × 0.5 mm). The EID detector’s total detector coverage is greater, hence the CTDIvol is about 10% less, as wider collimation settings are more dose efficient.
| Tube Potential (kV) | EID CTDIvol (mGy) | PCD CTDIvol (mGy) |
|---|---|---|
| 80 | 2.0 | 2.2 |
| 100 | 4.2 | 4.6 |
| 120 | 6.9 | 7.6 |
| 140 | 10.1 | 11.1 |