Table 3:
CTDIvols and the lens doses for both axial and helical scans with each CT scanner during whole-brain CT including the orbit
| CT Scanner (Number of Detector Rows) | Axial Scan |
Helical Scan |
||||
|---|---|---|---|---|---|---|
| Lens Dose (mGy) | CTDIvol (mGy) | Lens Dose/CTDIvol | Lens Dose (mGy) | CTDIvol (mGy) | Lens Dose/CTDIvol | |
| Aquilion 64 (64) | 103.5 ± 7.2 | 113.3 ± 0.0 | 91.4 ± 6.4% | 82.3 ± 7.3 | 96.0 ± 0.0 | 85.7 ± 7.6% |
| LightSpeed VCT (64) | 81.5 ± 9.8 | 101.1 ± 0.0 | 80.6 ± 9.7% | 75.4 ± 0.9 | 74.3 ± 0.0 | 101.5 ± 1.2% |
| LightSpeed Ultra 16 (16) | 71.5 ± 2.4 | 85.8 ± 0.0 | 83.3 ± 2.8% | 48.7 ± 0.9 | 59.6 ± 0.0 | 81.7 ± 1.5% |
| LightSpeed Ultra 8 (8) | 56.6 ± 0.9 | 66.5 ± 0.0 | 85.1 ± 1.3% | 45.6 ± 0.7 | 50.9 ± 0.0 | 89.7 ± 1.4% |
| LightSpeed QX/i (4) | 70.2 ± 1.5 | 75.1 ± 0.0 | 93.5 ± 2.0% | 66.7 ± 1.4 | 65.1 ± 0.0 | 102.5 ± 2.1% |
| Brilliance CT 64 (64) | 61.7 ± 4.9 | 72.4 ± 0.0 | 85.3 ± 6.8% | 52.6 ± 0.8 | 50.9 ± 0.0 | 103.4 ± 1.6% |
| MX 8000 IDT (16) | 48.1 ± 3.2 | 51.8 ± 0.0 | 92.8 ± 6.2% | 57.4 ± 1.4 | 57.0 ± 0.0 | 100.7 ± 2.4% |
| Somatom Sensation Cardiac (64) | 48.4 ± 1.7 | 58.9 ± 0.0 | 82.2 ± 2.8% | 42.6 ± 0.9 | 51.5 ± 0.0 | 82.8 ± 1.7% |