Visual assessment of the low contrast phantom
| Parameters | Sensitivity (%) | Specificity (%) | Accuracy (%) | |||
|---|---|---|---|---|---|---|
| 34 HU | 32 HU | 34 HU | 32 HU | 34 HU | 32 HU | |
| 100 kVp | 86.3 | 95.9 | 99.3 | 100.0 | 92.8 | 98.0 |
| 120 kVp | 85.4 | 92.9 | 99.5 | 100.0 | 92.4 | 96.4 |
| 135 kVp | 91.7 | 96.1 | 99.8 | 100.0 | 95.7* | 98.0 |
| 200 mAs | 92.5 | 100.0 | 98.3 | 100.0 | 95.4 | 100.0 |
| 450 mAs | 95.8 | 100.0 | 100.0 | 100.0 | 97.9 | 100.0 |
| 700 mAs | 96.7 | 100.0 | 100.0 | 100.0 | 98.3† | 100.0 |
| 5 mm | 83.8 | 92.5 | 99.1 | 100.0 | 91.5 | 96.2 |
| 10 mm | 86.2 | 93.2 | 99.8 | 100.0 | 93.0 | 96.6 |
| 20 mm | 89.8 | 98.4 | 100.0 | 100.0 | 94.9‡ | 99.2 |
* P < .05 compared with tube voltages of 100 kVp and 120 kVp.
† P < .05 compared with a tube current of 200 mAs.
‡ P < .05 compared with section thicknesses of 5 and 10 mm.