Radiation dose indices, noise, and CNR of temporal bone helical scans with different kVp
| kVp | Effective mAs | CTDIvol (mGy) | Noise (HU) | CNR | ||||
|---|---|---|---|---|---|---|---|---|
| Axial | Coronal | |||||||
| Brain Stem | Sphenoid | Brain Stem | Air | Axial | Coronal | |||
| 80 | 540 | 14.5 | 166.3 | 55.7 | 96.8 | 66.8 | 7.6 | 11.1 |
| 120 | 240 | 25.4 | 103.4 | 45.2 | 73.8 | 51.6 | 12.3 | 15.1 |
| 140 | 180 | 25.5 | 97.8 | 41.8 | 64.5 | 55.8 | 12.9 | 15.8 |