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. 2020 Apr;8(7):469. doi: 10.21037/atm.2020.03.114

Table S1. Feature type and associated features.

Feature type Methods Feature name
Shape-based Maximum 3D diameter (M3D)
Maximum 2D Diameter Slice (M2DS)
Sphericity
Minor Axis (MA)
Elongation
Surface Volume Ratio (SVR)
Volume
Major Axis (MA1)
Surface Area (SA)
Flatness
Least Axis (LA)
Maximum 2D Diameter Column (M2DC)
Maximum 2D Diameter Row (M2DR)
First order-based Histogram Interquartile Range (IQR)
Skewness
Uniformity
Median
Energy
Robust Mean Absolute Deviation (RMAD)
Mean Absolute Deviation (MAD)
Total Energy (TE)
Maximum
Root Mean Squared (RMS)
90 Percentile
Minimum
Entropy
Range
Variance
10 Percentile
Kurtosis
Mean
Texture-based GLCM Joint Average (JA)
Sum Average (SA)
Joint Entropy (JE)
Cluster Shade (CS)
Maximum Probability (MP)
Idmn
Joint Energy (JE)
Contrast
Difference Entropy (DE)
Inverse Variance (IV)
Difference Variance (DV)
Idn
Idm
Correlation
Autocorrelation
Sum Entropy (SE)
Sum Squares (SS)
Cluster Prominence (CP)
Imc2
Imc1
Difference Average (DA)
Id
Cluster Tendency (CT)
GLSZM Gray Level Variance (GLV)
Zone Variance (ZV)
Gray Level Non-Uniformity Normalized (GLNUN)
Size Zone Non-Uniformity Normalized (SZNUN)
Size Zone Non-Uniformity (SZNU)
Gray Level Non-Uniformity (GLNU)
Large Area Emphasis (LAE)
Small Area High Gray Level Emphasis (SAHGLE)
Zone Percentage (ZP)
Large Area Low Gray Level Emphasis (LALGLE)
Large Area High Gray Level Emphasis (LAHGLE)
High Gray Level Zone Emphasis (HGLZE)
Small Area Emphasis (SAE)
Low Gray Level Zone Emphasis (LGLZE)
Zone Entropy (ZE)
Small Area Low Gray Level Emphasis (SALGLE)
GLRLM Short Run Low Gray Level Emphasis (SRLGLE)
Gray Level Variance (GLV)
Low Gray Level Run Emphasis (LGLRE)
Gray Level Non-Uniformity Normalized (GLNUN)
Run Variance (RV)
Gray Level Non-Uniformity (GLNU)
Long Run Emphasis (LRE)
Short Run High Gray Level Emphasis (SRHGLE)
Run Length Non-Uniformity (RLNU)
Short Run Emphasis (SRE)
Long Run High Gray Level Emphasis (LRHGLE)
Run Percentage (RP)
Long Run Low Gray Level Emphasis (LRLGLE)
Run Entropy (RE)
High Gray Level Run Emphasis (HGLRE)
Run Length Non-Uniformity Normalized (RLNUN)
NGTDM Coarseness
Complexity
Strength
Contrast
Busyness
GLDM Gray Level Variance (GLV)
High Gray Level Emphasis (HGLE)
Dependence Entropy (DE)
Dependence Non-Uniformity (DNU)
Gray Level Non-Uniformity (GLNU)
Small Dependence Emphasis (SDE)
Small Dependence High Gray Level Emphasis (SDHGLE)
Dependence Non-Uniformity Normalized (DNUN)
Large Dependence Emphasis (LDE)
Large Dependence Low Gray Level Emphasis (LDLGLE)
Dependence Variance (DV)
Large Dependence High Gray Level Emphasis (LDHGLE)
Small Dependence Low Gray Level Emphasis (SDLGLE)
Low Gray Level Emphasis (LGLE)
Wavelet-based First-order statistic and texture of wavelet decomposition First-order features
GLCM features
GLSZM features
Decomposition levels: LLL, LLH, LHL, LHH, HLL, HLH, HHL, HHH GLRLM features
NGTDM features
GLDM features

GLCM, gray-level co-occurrence matrix, describe the second-order joint probability function of the voxel intensities within the contoured volume; GLSZM, gray-level size-zone matrix, quantify the number of connected voxels within the contoured volume that share the same gray level intensity; GLRLM, gray-level run-Length matrix, quantify the number of consecutive voxels that have the same gray level value; NGTDM, neighboring gray-tone difference matrix, quantify the difference between a gray value and the average gray value of its neighbors within 3×3×3 voxels neighborhood window; GLDM, gray-level dependence matrix, quantify the gray level dependencies in the contoured volume which is defined as the number of connected voxels within a specific distance that are dependent on the center voxel; Decomposition levels, i.e., LLH interpreted as the high-pass sub band, resulting from directional filtering of the volume with a low-pass filter along x-direction, a low pass filter along y-direction and a high-pass filter along z-direction