nRoA (%)

Correlation

P-value

Volume of the PTR

122.3

1.00

<0.05

Robust Features

Intensity

Minimum

7.0

−0.32

<0.05

Median

5.6

0.06

0.25

Mean

8.5

0.09

0.10

Variance

67.6

0.30

<0.05

Standard deviation (SD)

35.6

0.33

<0.05

Skewness

42.3

−0.36

<0.05

GLCM

Energy

72.6

−0.22

<0.05

Entropy

11.6

−0.31

<0.05

Correlation

69.5

−0.17

<0.05

Inverse difference moment (IDM)

32.3

−0.08

0.13

Inertia

83.6

0.03

0.57

GLRM

Short run emphasis (SRE)

1.5

0.25

<0.05

Long run emphasis (LRE)

42.9

−0.63

<0.05

High gray-level run emphasis (HGRE)

66.1

0.39

<0.05

Short run high gray-level emphasis (SRHGE)

66.7

0.39

<0.05

Long run high gray-level emphasis (LRHGE)

55.3

0.25

<0.05

Mean of Robust Features

41.8

Unrobust Features

Intensity

Maximum

125.0

−0.07

0.21

Sum

119.9

−0.85

<0.05

Kurtosis

120.1

−0.40

<0.05

GLCM

Cluster shade (CS)

139.5

0.09

0.09

Cluster prominence (CP)

194.7

0.08

0.14

Haralick’s correlation (HC)

130.9

0.38

<0.05

GLRM

Gray-level nonuniformity (GNU)

117.8

0.62

<0.05

Run-length nonuniformity (RNU)

124.4

0.85

<0.05

Low gray-level run emphasis (LGRE)

159.6

−0.24

<0.05

Short run low gray-level emphasis (SRLGE)

155.0

−0.23

<0.05

Long run low gray-level emphasis (LRLGE)

264.0

−0.32

<0.05

Mean of unrobust features

150.1