Table 4 Table showing the difference of SGLDM features in zoomed images and those without zoom. The latter were subsequently resampled to equalise their resolution (pixels/cm) 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
SGLDMfeature | Magnification | Feature value (median, interquartile range) | Difference with original (x1) image % | p |
|---|---|---|---|---|
ASM# | Zoomed | 0.00148, 0.00069–0.00611 | ||
Unzoomed | 0.00111, 0.00060–0.00359 | -24.61 | 0.016 | |
BLI | 0.00097, 0.00059–0.00323 | -34.05 | 0.001 | |
BLC | 0.00108, 0.00056–0.00902 | -26.75 | 0.267 | |
Contrast | Zoomed | 44.05, 35.81–69.32 | ||
Unzoomed | 75.00, 61.80–116.65 | 70.25 | <0.001 | |
BLI | 42.13, 33.19–66.41 | -4.36 | 0.003 | |
BLC | 43.32, 31.18–68.00 | -1.67 | 0.679 | |
Correlation | Zoomed | 0.98, 0.98–0.98 | ||
Unzoomed | 0.97, 0.96–0.97 | -1.28 | <0.001 | |
BLI | 0.98, 0.98–0.98 | 0.00 | 0.022 | |
BLC | 0.98, 0.97–0.98 | -0.15 | 0.349 | |
Variance | Zoomed | 1,299.83, 802.38–2,081.63 | ||
Unzoomed | 1,312.13, 1,047.72–2,123.97 | 0.95 | 0.349 | |
BLI | 1,342.30, 834.83–2,090.65 | 3.27 | 0.557 | |
BLC | 1,276.80, 845.90–2,071.28 | -1.77 | 0.396 | |
IDM## | Zoomed | 0.233, 0.182–0.315 | ||
Unzoomed | 0.190, 0.148–0.258 | -18.23 | <0.001 | |
BLI | 0.221, 0.186–0.291 | -4.88 | 0.078 | |
BLC | 0.249, 0.185–0.292 | 6.79 | 0.5 | |
Sum average | Zoomed | 90.36, 68.64–121.92 | ||
Unzoomed | 91.86, 70.48–123.22 | 1.66 | 0.133 | |
BLI | 93.99, 70.47–119.52 | 4.02 | 0.472 | |
BLC | 89.22, 69.16–119.17 | -1.26 | 0.472 | |
Sum variance | Zoomed | 5,164.32, 3,157.63–8,219.63 | ||
Unzoomed | 5,181.82, 4,122.93–8,329.45 | 0.34 | 0.286 | |
BLI | 5,336.16, 3,290.79–8,287.48 | 3.33 | 0.616 | |
BLC | 5,072.63, 3,327.85–8,202.29 | -1.78 | 0.372 | |
Sum entropy | Zoomed | 5.36, 5.04–5.57 | ||
Unzoomed | 5.39, 5.08–5.56 | 0.53 | 0.679 | |
BLI | 5.39, 5.15–5.65 | 0.51 | 0.011 | |
BLC | 5.36, 5.04–5.64 | 0.08 | 0.586 | |
Entropy | Zoomed | 7.26, 6.72–7.70 | ||
Unzoomed | 7.39, 6.94–7.86 | 1.79 | 0.001 | |
BLI | 7.71, 7.13–8.00 | 6.14 | <0.001 | |
BLC | 7.64, 7.10–7.96 | 5.17 | <0.001 | |
Difference variance | Zoomed | 22.13, 17.46–30.19 | ||
Unzoomed | 37.02, 29.07–50.07 | 67.29 | <0.001 | |
BLI | 20.68, 15.95–28.00 | -6.54 | 0.002 | |
BLC | 21.41, 16.54–32.15 | -3.23 | 0.248 | |
Difference entropy | Zoomed | 2.60, 2.47–2.81 | ||
Unzoomed | 2.83, 2.72–3.05 | 9.05 | <0.001 | |
BLI | 2.57, 2.46–2.80 | -1.04 | 0.011 | |
BLC | 2.59, 2.44–2.81 | -0.43 | 0.248 | |
IMC-1* | Zoomed | -0.383, -0.406–0.358 | ||
Unzoomed | -0.352, -0.366–0.332 | -7.94 | <0.001 | |
BLI | -0.375, -0.411–0.356 | -1.94 | 0.372 | |
BLC | -0.369, -0.402–0.352 | -3.59 | 0.071 | |
IMC-2** | Zoomed | 0.981, 0.978–0.985 | ||
Unzoomed | 0.977, 0.967–0.981 | -0.46 | <0.001 | |
BLI | 0.985, 0.979–0.989 | 0.36 | <0.001 | |
BLC | 0.984, 0.977–0.987 | 0.23 | 0.306 |