Table 3. Results of objective analyses of reconstruction techniques for computed tomography imaging of simulated neck scans of a child aged 5 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 | 16.74 | 20.09 | 14.27 | 16.21 | 18.24 | 16.54 | 14.31 | 13.67 | 24.09 | 44.05 | 16.01 | 38.32 |
| 40 mA | 11.21 | 9.62 | 14.45 | 8.71 | 16.77 | 9.34 | 16.35 | 7.91 | 21.96 | 15.13 | 12.70 | 14.98 |
| 80 mA | 12.05 | 7.27 | 16.51 | 7.22 | 18.09 | 6.02 | 17.62 | 6.13 | 20.93 | 10.80 | 13.67 | 10.59 |
| 120 mA | 12.25 | 5.93 | 15.10 | 5.64 | 18.54 | 5.86 | 17.62 | 5.25 | 22.42 | 8.42 | 14.14 | 9.81 |
| 150 mA | 13.07 | 5.43 | 14.82 | 5.17 | 18.85 | 5.40 | 16.39 | 4.81 | 20.80 | 7.19 | 15.32 | 8.32 |
| 200 mA | 11.94 | 4.20 | 14.89 | 4.87 | 18.05 | 4.34 | 16.43 | 4.78 | 24.59 | 6.98 | 16.49 | 7.82 |
| 250 mA | 13.24 | 4.00 | 16.23 | 4.67 | 18.43 | 4.25 | 17.85 | 3.96 | 20.49 | 6.75 | 14.29 | 7.46 |
| 100 kVp | ||||||||||||
| 10 mA | 17.12 | 14.33 | 19.06 | 10.98 | 21.99 | 11.96 | 20.14 | 11.32 | 21.81 | 20.55 | 15.73 | 18.99 |
| 40 mA | 15.84 | 6.47 | 18.51 | 6.14 | 22.31 | 5.92 | 19.29 | 5.86 | 22.55 | 9.89 | 17.75 | 9.73 |
| 80 mA | 16.77 | 4.66 | 18.05 | 4.66 | 21.30 | 4.53 | 18.92 | 4.52 | 23.05 | 7.18 | 18.05 | 8.92 |
| 120 mA | 16.56 | 4.70 | 18.19 | 4.50 | 22.89 | 4.30 | 19.73 | 3.96 | 22.08 | 5.85 | 17.74 | 6.38 |
| 150 mA | 16.87 | 3.50 | 19.27 | 4.26 | 22.60 | 4.24 | 19.38 | 3.65 | 19.45 | 5.68 | 18.60 | 5.94 |
| 200 mA | 16.68 | 3.07 | 19.06 | 3.72 | 22.57 | 4.18 | 18.62 | 3.40 | 24.57 | 4.83 | 19.65 | 5.35 |
| 250 mA | 16.42 | 3.01 | 18.90 | 3.45 | 22.45 | 4.09 | 18.01 | 3.01 | 25.01 | 4.34 | 18.99 | 5.01 |
| 120 kVp | ||||||||||||
| 10 mA | 19.57 | 11.01 | 21.05 | 9.45 | 24.61 | 9.72 | 22.24 | 9.14 | 23.80 | 15.79 | 18.33 | 17.25 |
| 40 mA | 18.75 | 5.49 | 21.69 | 5.62 | 24.99 | 5.09 | 21.64 | 4.42 | 23.42 | 8.86 | 20.64 | 7.89 |
| 80 mA | 19.00 | 4.00 | 19.71 | 4.44 | 23.80 | 4.26 | 22.54 | 3.73 | 26.58 | 6.36 | 20.63 | 6.88 |
| 120 mA | 19.26 | 3.61 | 19.41 | 4.26 | 24.92 | 4.19 | 21.23 | 3.41 | 25.08 | 5.52 | 19.58 | 6.03 |
| 150 mA | 20.33 | 2.59 | 21.04 | 3.86 | 25.58 | 4.08 | 21.39 | 3.40 | 26.02 | 4.69 | 21.51 | 4.85 |
| 200 mA | 20.07 | 2.46 | 21.32 | 3.43 | 25.37 | 4.03 | 21,90 | 3.17 | 22.59 | 4.61 | 21.32 | 4.45 |
| 250 mA | 20.01 | 2.30 | 22.59 | 3.26 | 24.37 | 3.22 | 22.01 | 2.84 | 26.06 | 3.97 | 22.26 | 3.88 |
| Comparison | P | |||||||||||
| 120 kVp vs. 100 kVp | NS | NS | NS | NS | NS | NS | ||||||
| 120 kVp vs. 80 kVp | NS | NS | NS | NS | NS | NS | ||||||