Table 1.

List of Radiomics feature classes.

Radiomics feature class	Description
Shape	Descriptors of the 3D/2D-size and shape of the ROI
First-order	Describe the distribution of voxel intensities within the ROI
GLDM	Quantify the gray level dependencies (the number of connected voxels within a certain distance that are dependent on the center voxel) in the ROI
GLRLM	Quantify the gray level runs (the length in number of voxels that have the same intensity)
GLSZM	Quantify gray level zones (the number of connected voxels with the same intensity) in the ROI
Wavelet-based	Wavelet transformation based on above features

GLDM, gray level dependence matrix; GLRLM, gray level run length matrix; GLSZM, gray level size zone matrix.