Table 3. Summary of the maximum diameter, volume and CT value of the nodules with the different density.
| Parameters | Number | Maximum diameter (mm) | volume (mm3) | CT value (HU) |
|---|---|---|---|---|
| The partial-solid density nodules | ||||
| A*120kV-1 | 10 | 6.75±0.779 | 99.80±23.979 | −636.3±30.02 |
| B*80kV-1 | 6.83±0.674 | 99.03±22.851 | −654.9±16.97 | |
| T value | −0.301 | 0.07 | 0.764 | |
| P value | 0.77 | 0.946 | 0.464 | |
| The solid density nodules | ||||
| A*120kV-2 | 66 | 11.08±0.87 | 753.48±157.92 | −263.06±26.92 |
| B*80kV-2 | 10.95±0.88 | 740.89±156.97 | −265.47±27.57 | |
| T value | 0.959 | 2.47 | 0.273 | |
| P value | 0.341 | 0.016 (P<0.05) | 0.786 | |
| The calcified nodules | ||||
| A*120kV-3 | 20 | 6.02±0.62 | 51.70±9.94 | −184.20±59.09 |
| B*80kV-3 | 6.43±0.66 | 53.48±9.13 | −137.20±68.56 | |
| T value | −0.592 | −0.269 | −1.301 | |
| P value | 0.561 | 0.791 | 0.209 | |
No significant differences among the partial-solid density, solid density or calcified nodules were found for their respective maximum diameter or CT value (P>0.05). However, there is significant difference in the volume of the solid density nodules, but not partially solid density or calcified nodules, between 80 and 120 kV. The average volume appears to be 1.68% lower in 80 kV than that in 120 kV.