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Table 2 Table showing the difference of histogram features (subcontour analysis), PP < 30 and PP < 50 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

Histogram features

Magnification

Feature value (median, interquartile range)

Difference with original (x1) image %

p

PPCS1

Zoomed

14.56, 9.63–29.23

  
 

Unzoomed

14.09, 9.07–29.07

-3.22

0.679

 

BLI

13.26, 9.98–24.53

-8.97

0.811

 

BLC

17.36, 10.52–29.46

19.24

0.215

PPCS2

Zoomed

12.84, 8.96–18.60

  
 

Unzoomed

13.07, 7.91–17.01

1.84

0.022

 

BLI

13.04, 8.93–16.14

1.56

0.286

 

BLC

13.48, 7.66–16.28

5.03

0.17

PPCS3

Zoomed

12.24, 9.54–14.75

  
 

Unzoomed

11.58, 9.26–14.06

-5.38

0.012

 

BLI

11.43, 9.45–13.81

-6.59

0.031

 

BLC

12.32, 8.62–14.75

0.67

0.215

PPCS4

Zoomed

10.10, 7.97–11.71

  
 

Unzoomed

11.02, 7.93–13.52

9.15

0.396

 

BLI

11.00, 7.74–13.29

8.88

0.472

 

BLC

10.76, 8.64–12.90

6.52

0.248

PPCS5

Zoomed

8.14, 6.27–11.00

  
 

Unzoomed

8.45, 6.17–11.01

3.77

0.879

 

BLI

8.40, 7.00–10.98

3.21

0.396

 

BLC

7.59, 6.74–11.08

-6.79

0.879

PP < 30

Zoomed

44.10, 32.33–59.75

  
 

Unzoomed

42.43, 29.35–58.38

-3.78

0.071

 

BLI

38.91, 30.26–57.52

-11.77

0.248

 

BLC

43.82, 27.97–61.06

-0.64

0.948

PP < 50

Zoomed

67.20, 51.71–75.61

  
 

Unzoomed

66.06, 50.39–74.18

-1.69

0.071

 

BLI

66.23, 52.45–75.02

-1.44

0.306

 

BLC

67.22, 50.10–76.80

0.03

0.5