Table 5 Table showing the difference of GLDS features in zoomed images and those without zoom. The latter were subsequently resampled to equalise their resolution (pixels/mm) with the corresponding zoomed ones, by using bilinear (BLI) or bicubic (BCI) interpolation. Percent difference with zoomed image are also shown. Statistically significant differences are highlighted.
From: Effect of zooming on texture features of ultrasonic images
GLDS features | Magnification | Feature value (median, interquartile range) | Difference with original (x1) image % | p |
|---|---|---|---|---|
Homogeneity | Zoomed | 0.233, 0.182–0.315 | ||
Unzoomed | 0.191, 0.149–0.258 | -18.14 | <0.001 | |
BLI | 0.222, 0.186–0.291 | -4.83 | 0.078 | |
BLC | 0.249, 0.186–0.293 | 6.92 | 0.5 | |
Contrast | Zoomed | 43.87, 35.74–69.05 | ||
Unzoomed | 74.70, 61.62–116.23 | 70.27 | <0.001 | |
BLI | 41.96, 33.11–66.14 | -4.35 | 0.003 | |
BLC | 43.22, 31.11–67.69 | -1.49 | 0.679 | |
Energy | Zoomed | 0.092, 0.075–0.115 | ||
Unzoomed | 0.074, 0.059–0.089 | -19.79 | <0.001 | |
BLI | 0.095, 0.074–0.111 | 2.38 | 0.17 | |
BLC | 0.095, 0.073–0.115 | 2.21 | 0.267 | |
Entropy | Zoomed | 2.63, 2.49–2.84 | ||
Unzoomed | 2.86, 2.75–3.08 | 8.63 | <0.001 | |
BLI | 2.60, 2.49–2.84 | -1.25 | 0.012 | |
BLC | 2.61, 2.48–2.85 | -0.65 | 0.306 | |
Mean | Zoomed | 4.75, 4.00–6.11 | ||
Unzoomed | 6.24, 5.32–7.87 | 31.28 | <0.001 | |
BLI | 4.62, 3.97–5.98 | -2.81 | 0.003 | |
BLC | 4.65, 3.96–6.07 | -2.10 | 0.845 |