Table 3. CT texture and margin analyses of invasive mucinous adenocarcinoma and bacterial pneumonia.
| ICC (P value) | Mucinous adenocarcinoma | Bacterial pneumonia | *P value | |
|---|---|---|---|---|
| Mean attenuation (HU) | 0.96 (<0.001) | 36.0 ± 38.6 | 43.8 ± 57.3 | 0.47 |
| Skewness | 0.54 (<0.001) | -0.1 ± 0.4 | - 0.004 ± 0.1 | 0.05 |
| Kurtosis | -0.06 (0.610) | 0.4 ± 1.5 | - 0.005 ± 0.1 | 0.07 |
| Entropy | 0.79 (<0.001) | 6.9 ± 0.1 | 6.9 ± 0.2 | 0.35 |
| 5-pixel max. slope | 0.85 (<0.001) | -209.7 ± 39.0 | -176.6 ± 41.2 | <0.001 |
| 7-pixel max. slope | 0.85 (<0.001) | -156.5 ± 25.4 | -133.8 ± 27.3 | <0.001 |
| 9-pixel max. slope | 0.85 (<0.001) | -124.4 ± 18.3 | -108.7 ± 19.7 | <0.001 |
| 5-pixel avg. slope | 0.82 (<0.001) | -191.4 ± 42.5 | -156.4 ± 44.2 | <0.001 |
| 7-pixel avg. slope | 0.82 (<0.001) | -148.2 ± 28.0 | -124.7 ± 29.2 | <0.001 |
| 9-pixel avg. slope | 0.84 (<0.001) | -119.4 ± 19.7 | -102.8 ± 21.1 | <0.001 |
Note.
*The differences of CT texture and margin parameters between invasive mucinous adenocarcinoma and bacterial pneumonia were calculated using Student t-test. HU, Hounsfiled unit; ICC, intraclass correlation coefficient among regions of interest per lesion; max., maximal; avg., average.