Table 2.
Characteristics of scan protocols included in the study
| Parameters | Head scan | Neck scan | ||||||
|---|---|---|---|---|---|---|---|---|
| 4-slices | 6-slices | 16-slices | 64-slices | 4-slices | 6-slices | 16-slices | 64-slices | |
| No. of patients | 20 | 37 | 20 | 30 | 22 | 15 | 11 | 14 |
| kV | 120 | 110 | 110 | 120 | 120 | 110 | 110 | 120 |
| mAs | 165 ± 23 | 149 ± 35 | 125 ± 18 | 352 ± 74 | 127 ± 25 | 120 ± 64 | 110 ± 21 | 194 ± 39 |
| Collimation | 4 × 1 | 6 × 3 | 12 × 1.2 | 24 × 1.2 | 4 × 2.5 | 6 × 2 | 16 × 1.2 | 64 × 0.6 |
| Pitch | Axial | Axial | Axial | Axial | 1.7, 0.8 | 1.5, 1.2 | 1.5 | 1.5, 1.2, 1.3 |
| Scan length [mm] | 130 ± 17 | 136 ± 41 | 135 ± 15 | 139 ± 25 | 181 ± 10 | 158 ± 62 | 225 ± 74 | 237 ± 43 |
Values are presented in mean ± SD