Table 4. Results of objective analyses of reconstruction techniques for computed tomography imaging of simulated neck scans of a child aged 10 years.
| Protocol | Anterior upper neck | Posterior upper neck | Anterior thyroid gland | Posterior thyroid gland | Anterior upper mediastinum | Posterior upper mediastinum | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CT number (HU) | Noise (HU) | CT number (HU) | Noise (HU) | CT number (HU) | Noise (HU) | CT number (HU) | Noise (HU) | CT number (HU) | Noise (HU) | CT number (HU) | Noise (HU) | |
| 80 kVp | ||||||||||||
| 10 mA | 39.66 | 87.93 | 33.80 | 63.14 | 21.97 | 53.66 | 23.10 | 62.73 | 13.04 | 139.25 | 60.59 | 149.87 |
| 40 mA | 21.37 | 25.87 | 15.30 | 26.08 | 16.10 | 22.37 | 25.64 | 24.54 | 21.88 | 51.03 | 20.74 | 49.60 |
| 80 mA | 20.17 | 17.39 | 13.20 | 20.47 | 16.51 | 14.85 | 20.12 | 17.37 | 18.96 | 32.96 | 18.52 | 32.79 |
| 120 mA | 23.12 | 15.99 | 13.85 | 15.58 | 15.20 | 13.29 | 19.73 | 14.64 | 20.49 | 26.32 | 20.18 | 28.15 |
| 150 mA | 19.99 | 11.58 | 12.62 | 13.29 | 17.74 | 9.81 | 22.45 | 14.37 | 24.50 | 21.77 | 12.31 | 24.83 |
| 200 mA | 21.57 | 9.98 | 12.92 | 12.84 | 14.68 | 8.82 | 22.00 | 10.34 | 20.26 | 17.75 | 17.96 | 22.67 |
| 250 mA | 21.48 | 9.78 | 16.22 | 11.51 | 18.25 | 7.64 | 18.96 | 10.18 | 21.46 | 17.31 | 18.19 | 18.49 |
| 100 kVp | ||||||||||||
| 10 mA | 25.84 | 43.28 | 14.95 | 38.58 | 17.09 | 31.26 | 25.23 | 32.93 | 16.21 | 65.71 | 40.87 | 78.50 |
| 40 mA | 24.10 | 16.93 | 19.20 | 18.48 | 20.64 | 15.83 | 23.33 | 18.96 | 17.71 | 29.95 | 18.00 | 33.09 |
| 80 mA | 25.51 | 13.77 | 15.61 | 12.40 | 19.53 | 10.73 | 25.36 | 12.18 | 19.52 | 17.84 | 20.90 | 21.66 |
| 120 mA | 21.78 | 9.87 | 17.89 | 10.13 | 21.08 | 9.60 | 26.00 | 10.63 | 19.40 | 15.88 | 18.06 | 18.41 |
| 150 mA | 25.40 | 8.78 | 16.81 | 8.93 | 20.69 | 8.07 | 23.97 | 9.54 | 18.72 | 12.30 | 20.43 | 15.73 |
| 200 mA | 23.23 | 7.71 | 18.33 | 8.46 | 21.50 | 7.67 | 27.75 | 8.35 | 18.80 | 12.01 | 16.73 | 12.31 |
| 250 mA | 25.10 | 6.91 | 16.94 | 8.02 | 20.27 | 7.05 | 24.88 | 6.96 | 20.28 | 11.92 | 21.10 | 11.21 |
| 120 kVp | ||||||||||||
| 10 mA | 25.20 | 26.18 | 21.82 | 26.42 | 21.65 | 23.86 | 27.99 | 26.52 | 26.20 | 48.29 | 21.68 | 48.57 |
| 40 mA | 27.07 | 15.58 | 17.79 | 15.52 | 23.88 | 13.98 | 26.11 | 13.04 | 22.12 | 20.80 | 22.25 | 22.31 |
| 80 mA | 27.46 | 10.58 | 19.97 | 10.08 | 23.33 | 8.82 | 25.40 | 9.83 | 21.59 | 18.87 | 23.13 | 14.54 |
| 120 mA | 25.27 | 7.53 | 21.66 | 9.14 | 23.49 | 6.70 | 29.95 | 8.21 | 22.87 | 14.51 | 19.99 | 13.18 |
| 150 mA | 25.50 | 7.41 | 22.16 | 8.16 | 24.10 | 6.65 | 29.41 | 8.10 | 22.16 | 11.29 | 19.65 | 12.91 |
| 200 mA | 26.25 | 6.51 | 21.17 | 7.45 | 24.11 | 5.37 | 28.59 | 7.65 | 23.62 | 10.49 | 20.46 | 10.55 |
| 250 mA | 27.37 | 6.13 | 20.31 | 6.76 | 22.57 | 5.24 | 27.65 | 6.60 | 21.02 | 9.83 | 23.53 | 8.90 |
| Comparison | P | |||||||||||
| 120 kVp vs. 100 kVp | NS | NS | NS | NS | NS | NS | ||||||
| 120 kVp vs. 80 kVp | NS | NS | NS | NS | NS | NS | ||||||