| 120 kV | 100 kV | 100 kV i |
SD (HU) | |||
Skull base | 4.12 ± 0.36 | 4.22 ± 0.31 | 4.04 ± 0.33 |
Basal ganglia | 3.99 ± 0.34 | 4.17 ± 0.31 | 4.00 ± 0.24 |
Vertex | 3.99 ± 0.35 | 4.25 ± 0.37 | 4.08 ± 0.36 |
Average | 4.02 ± 0.27 | 4.22 ± 0.23 | 4.04 ± 0.24 |
CT value (HU) | |||
Gray matter | 37.24 ± 2.59 | 40.79 ± 1.07 | 40.80 ± 1.12 |
White matter | 30.16 ± 2.36 | 32.13 ± 1.11 | 32.11 ± 0.97 |
Contrast of them | 7.08 ± 0.56 | 8.66 ± 0.73 | 8.68 ± 0.61 |
CNR | 1.77 ± 0.13 | 2.06 ± 0.15 | 2.15 ± 0.15 |
Output dose (estimated patient exposure dose) | |||
CTDIvol (mGy) | 84.23 ± 3.87 | 85.90 ± 1.46 | 58.78 ± 4.33 |
DLP (mGy∙mm) | 1412 ± 109.1 | 1481 ± 143.1 | 1027 ± 92.7 |
Effective dose (mSv) | 2.97 ± 0.23 | 3.09 ± 0.30 | 2.16 ± 0.19 |