Table 2. Summary of representative higher order statistical radiomic features.

Encoding scheme	Feature
Gray-level intensity histogram (GLIH)	Standard deviation
	Skewness
	Kurtosis
	Energy
	Entropy
Gray-level co-occurrence matrix (GLCOM)	Autocorrelation
	Contrast
	Correlation
	Dissimilarity
	Energy
	Entropy
	Homogeneity
Gray-level neighborhood difference matrix (GLNDM)	Coarseness
	Contrast
	Busyness
	Complexity
	Strength
Gray-level run length matrix (GLRLM)	Short runs emphasis
	Long runs emphasis
	Low gray-level runs emphasis
	High gray-level runs emphasis
	Short runs low gray-level emphasis
	Short runs high gray-level emphasis
	Long runs low gray-level emphasis
	Long runs high gray-level emphasis
	Gray-level non-uniformity
	Run length non-uniformity
	Run percentage
Gray-level size zone matrix (GLSZM)	Short zones emphasis
	Large zones emphasis
	Low gray-level zones emphasis
	High gray-level zones emphasis
	Short zones low gray-level emphasis
	Short zones high gray-level emphasis
	Large zones low gray-level emphasis
	Large zones high gray-level emphasis
	Gray-level non-uniformity
	Zone size non-uniformity
	Zone percentage