Table 3 Radiomics feature naming convention
Class | Abbreviation | Description |
|---|---|---|
Modality | PET | Positron emission tomography |
CT | Computed tomography | |
Image Filter | Original | No filter applied |
Wavelet-HLH | Wavelet filtering | |
Square | Takes the square of the image | |
Gradient | gradient magnitude | |
lbp-2D | Calculates and returns a local binary pattern applied in 2D | |
Matrix | firstorder | Voxel intensities within the image ROI through commonly used and basic metrics |
glcm | Gray-level co-occurrence matrix | |
glrlm | Gray-level run length matrix | |
glszm | Gray-level size zone | |
Index | Kurtosis | Kurtosis is a measure of the ‘peakedness’ of the distribution of values in the image ROI |
Median | The median gray-level intensity within the ROI | |
Skewness | Skewness measures the asymmetry of the distribution of values about the mean value | |
Idmn | IDMN (inverse difference moment normalized) is a measure of the local homogeneity of an image | |
ClusterShade | Cluster shade is a measure of the skewness and uniformity of the GLCM | |
Imc1 | IMC1 assesses the correlation between the probability distributions of i and j in the GLCM | |
HighGrayLevelRunEmphasis | HighGrayLevelRunEmphasis measures the distribution of the higher gray-level values in the GLRLM | |
Correlation | Correlation is a value between 0 (uncorrelated) and 1 (perfectly correlated) showing the linear dependency of gray-level values to their respective voxels in the GLCM | |
LowGrayLevelZoneEmphasis | LGLZE measures the distribution of lower gray-level size zones, with a higher value indicating a greater proportion of lower gray-level values and size zones in the image | |
SizeZoneNonUniformity | SZN measures the variability of size zone volumes in the image, with a lower value indicating more homogeneity in size zone volumes |