Table 3.

The 19 features to differentiate tumor from proximal tumor-distant tissue of esophageal squamous cell carcinoma

Image type	Feature class	Feature name
Original	Shape	Flatness
Original	Shape	Sphericity
Original	Shape	SurfaceVolumeRatio
Original	Firstorder	Median
Log-sigma-0-5-mm-3D	Glcm	Idmn
Log-sigma-0-5-mm-3D	Glszm	GrayLevelNonUniformity
Log-sigma-1-0-mm-3D	Firstorder	Kurtosis
Log-sigma-1-0-mm-3D	Glcm	Idmn
Log-sigma-2-0-mm-3D	Gldm	LargeDependenceEmphasis
Log-sigma-2-0-mm-3D	Glrlm	GrayLevelNonUniformity
Wavelet-LLH	Glcm	ClusterProminence
Wavelet-LLH	Glcm	MCC
Wavelet-LLH	Glrlm	ShortRunHighGrayLevelEmphasis
Wavelet-LHL	Glcm	Imc2
Wavelet-HLL	Glcm	Imc1
Wavelet-HLL	Glcm	Imc2
Wavelet-HLL	Ngtdm	Strength
Wavelet-HHH	Glszm	SmallAreaEmphasis
Wavelet-LLL	Glcm	Correlation

Glcm gray-level co-occurrence matrix, Glszm gray-level size zone matrix, Gldm gray-level dependence matrix, Glrlm gray-level run-length matrix, Ngtdm neighboring gray tone difference matrix, Idmn inverse difference moment normalized, MCC maximal correlation coefficient, Imc1 informational measure of correlation 1, Imc2 informational measure of correlation 2