IBSI Standard and Radiomics Function Feature Correspondences

Radiomics is a technique for extracting a large number of quantitative features from medical images. Radiomics features relate to the shape, intensity, and texture of a specified region of interest (ROI) in a medical image. They contain characteristic information about the medical image that can help in clinical diagnosis.

Standardization of radiomics features ensures reproducibility and validation of radiomics studies. The image biomarker standardisation initiative (IBSI) provides standardized nomenclature and definitions for radiomics features, a standard procedure for medical image preprocessing, and reporting guidelines, among other standardization tools.

These tables list the radiomics features related to shape, intensity, and texture as defined by IBSI standards, as well as the corresponding feature names in the shapeFeatures, intensityFeatures, and textureFeatures functions of the radiomics object. The tables also specify the relevant Type and SubType of the feature. The Type of the feature is applicable only to intensity features and texture features. It indicates the category of features within the intensity features and texture features. The SubType indicates resampling done for feature computation. For shapeFeatures and intensityFeatures, the SubType indicates whether the features are computed from 2D resampled data, 3D resampled data, or both. For textureFeatures, the SubType indicates whether the features are computed for each 2D slice in the 2D resampled data and averaged, after merging all 2D slices in the 2D resampled data, for the entire 3D volume in the 3D resampled data, or all three options.

Shape Features

Compute these shape features using the shapeFeatures function. You can compute only the 2D or 3D shape features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in shapeFeatures Output	SubType
Volume (mesh)	VolumeMesh2D	"2D"
	VolumeMesh3D	"3D"
Volume (voxel counting)	VolumeVoxelCount2D	"2D"
	VolumeVoxelCount3D	"3D"
Surface area (mesh)	SurfaceAreaMesh2D	"2D"
	SurfaceAreaMesh3D	"3D"
Surface to volume ratio	SurfaceVolumeRatio2D	"2D"
	SurfaceVolumeRatio3D	"3D"
Compactness 1	Compactness1_2D	"2D"
	Compactness1_3D	"3D"
Compactness 2	Compactness2_2D	"2D"
	Compactness2_3D	"3D"
Spherical disproportion	SphericalDisproportion2D	"2D"
	SphericalDisproportion3D	"3D"
Sphericity	Sphericity2D	"2D"
	Sphericity3D	"3D"
Asphericity	Asphericity2D	"2D"
	Asphericity3D	"3D"
Centre of mass shift	CentreOfMassShift2D	"2D"
	CentreOfMassShift3D	"3D"
Maximum 3D diameter	Maximum3dDiameter2D	"2D"
	Maximum3dDiameter3D	"3D"
Major axis length	MajorAxisLength2D	"2D"
	MajorAxisLength3D	"3D"
Minor axis length	MinorAxisLength2D	"2D"
	MinorAxisLength3D	"3D"
Least axis length	LeastAxisLength2D	"2D"
	LeastAxisLength3D	"3D"
Elongation	Elongation2D	"2D"
	Elongation3D	"3D"
Flatness	Flatness2D	"2D"
	Flatness3D	"3D"
Volume density (axis-aligned bounding box)	VolumeDensityAABB_2D	"2D"
	VolumeDensityAABB_3D	"3D"
Area density (axis-aligned bounding box)	AreaDensityAABB_2D	"2D"
	AreaDensityAABB_3D	"3D"
Volume density (approximate enclosing ellipsoid)	VolumeDensityAEE_2D	"2D"
	VolumeDensityAEE_3D	"3D"
Area density (approximate enclosing ellipsoid)	AreaDensityAEE_2D	"2D"
	AreaDensityAEE_3D	"3D"
Volume density (convex hull)	VolumeDensityConvexHull2D	"2D"
	VolumeDensityConvexHull3D	"3D"
Area density (convex hull)	AreaDensityConvexHull2D	"2D"
	AreaDensityConvexHull3D	"3D"
Integrated intensity	IntegratedIntensity2D	"2D"
	IntegratedIntensity3D	"3D"

Intensity Features

Compute intensity features using the intensityFeatures function. To compute all categories of intensity features listed in this section, specify Type as "all".

Local Intensity Features

To compute only these intensity features, when using the intensityFeatures function, specify Type as "LocalIntensity". You can compute only the 2D or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in intensityFeatures Output	SubType
Local intensity peak	LocalIntensityPeak2D	"2D"
	LocalIntensityPeak3D	"3D"
Global intensity peak	GlobalIntensityPeak2D	"2D"
	GlobalIntensityPeak3D	"3D"

Intensity Based Statistical Features

To compute only these intensity features, when using the intensityFeatures function, specify Type as "IntensityBasedStatistics". You can compute only the 2D or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in intensityFeatures Output	SubType
Mean intensity	MeanIntensity2D	"2D"
	MeanIntensity3D	"3D"
Intensity variance	IntensityVariance2D	"2D"
	IntensityVariance3D	"3D"
Intensity skewness	IntensitySkewness2D	"2D"
	IntensitySkewness3D	"3D"
(Excess) intensity kurtosis	IntensityKurtosis2D	"2D"
	IntensityKurtosis3D	"3D"
Median intensity	MedianIntensity2D	"2D"
	MedianIntensity3D	"3D"
Minimum intensity	MinimumIntensity2D	"2D"
	MinimumIntensity3D	"3D"
10th intensity percentile	TenthIntensityPercentile2D	"2D"
	TenthIntensityPercentile3D	"3D"
90th intensity percentile	NinetiethIntensityPercentile2D	"2D"
	NinetiethIntensityPercentile3D	"3D"
Maximum intensity	MaximumIntensity2D	"2D"
	MaximumIntensity3D	"3D"
Intensity interquartile range	IntensityInterquartileRange2D	"2D"
	IntensityInterquartileRange3D	"3D"
Intensity range	IntensityRange2D	"2D"
	IntensityRange3D	"3D"
Intensity-based mean absolute deviation	MeanAbsoluteDeviation2D	"2D"
	MeanAbsoluteDeviation3D	"3D"
Intensity-based robust mean absolute deviation	RobustMeanAbsoluteDeviation2D	"2D"
	RobustMeanAbsoluteDeviation3D	"3D"
Intensity-based median absolute deviation	MedianAbsoluteDeviation2D	"2D"
	MedianAbsoluteDeviation3D	"3D"
Intensity-based coefficient of variation	CoefficientOfVariation2D	"2D"
	CoefficientOfVariation3D	"3D"
Intensity-based quartile coefficient of dispersion	QuartileCoefficientOfDispersion2D	"2D"
	QuartileCoefficientOfDispersion3D	"3D"
Intensity-based energy	IntensityEnergy2D	"2D"
	IntensityEnergy3D	"3D"
Root mean square intensity	RootMeanSquare2D	"2D"
	RootMeanSquare3D	"3D"

Intensity Histogram Features

To compute only these intensity features, when using the intensityFeatures function, specify Type as "IntensityHistogram". You can compute only the 2D or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in intensityFeatures Output	SubType
Mean discretised intensity	MeanDiscretisedIntensity2D	"2D"
	MeanDiscretisedIntensity3D	"3D"
Discretised intensity variance	DiscretisedIntensityVariance2D	"2D"
	DiscretisedIntensityVariance3D	"3D"
Discretised intensity skewness	DiscretisedIntensitySkewness2D	"2D"
	DiscretisedIntensitySkewness3D	"3D"
(Excess) discretised intensity kurtosis	DiscretisedIntensityKurtosis2D	"2D"
	DiscretisedIntensityKurtosis3D	"3D"
Median discretised intensity	MedianDiscretisedIntensity2D	"2D"
	MedianDiscretisedIntensity3D	"3D"
Minimum discretised intensity	MinimumDiscretisedIntensity2D	"2D"
	MinimumDiscretisedIntensity3D	"3D"
10th discretised intensity percentile	TenthDiscretisedIntensityPercentile2D	"2D"
	TenthDiscretisedIntensityPercentile3D	"3D"
90th discretised intensity percentile	NinetiethDiscretisedIntensityPercentile2D	"2D"
	NinetiethDiscretisedIntensityPercentile3D	"3D"
Maximum discretised intensity	MaximumDiscretisedIntensity2D	"2D"
	MaximumDiscretisedIntensity3D	"3D"
Intensity histogram mode	IntensityHistogramMode2D	"2D"
	IntensityHistogramMode3D	"3D"
Discretised intensity interquartile range	DiscretisedIntensityInterquartileRange2D	"2D"
	DiscretisedIntensityInterquartileRange3D	"3D"
Discretised intensity range	DiscretisedIntensityRange2D	"2D"
	DiscretisedIntensityRange3D	"3D"
Intensity histogram mean absolute deviation	IntensityHistogramMeanAbsoluteDeviation2D	"2D"
	IntensityHistogramMeanAbsoluteDeviation3D	"3D"
Intensity histogram robust mean absolute deviation	IntensityHistogramRobustMeanAbsoluteDeviation2D	"2D"
	IntensityHistogramRobustMeanAbsoluteDeviation3D	"3D"
Intensity histogram median absolute deviation	IntensityHistogramMedianAbsoluteDeviation2D	"2D"
	IntensityHistogramMedianAbsoluteDeviation3D	"3D"
Intensity histogram coefficient of variation	IntensityHistogramCoefficientOfVariation2D	"2D"
	IntensityHistogramCoefficientOfVariation3D	"3D"
Intensity histogram quartile coefficient of dispersion	IntensityHistogramQuartileCoefficientOfDispersion2D	"2D"
	IntensityHistogramQuartileCoefficientOfDispersion3D	"3D"
Discretised intensity entropy	DiscretisedIntensityEntropy2D	"2D"
	DiscretisedIntensityEntropy3D	"3D"
Discretised intensity uniformity	DiscretisedIntensityUniformity2D	"2D"
	DiscretisedIntensityUniformity3D	"3D"
Maximum histogram gradient	MaximumHistogramGradient2D	"2D"
	MaximumHistogramGradient3D	"3D"
Maximum histogram gradient intensity	MaximumHistogramGradientIntensity2D	"2D"
	MaximumHistogramGradientIntensity3D	"3D"
Minimum histogram gradient	MinimumHistogramGradient2D	"2D"
	MinimumHistogramGradient3D	"3D"
Minimum histogram gradient intensity	MinimumHistogramGradientIntensity2D	"2D"
	MinimumHistogramGradientIntensity3D	"3D"

Intensity Volume Histogram Features

To compute only these intensity features, when using the intensityFeatures function, specify Type as "IntensityVolumeHistogram". You can compute only the 2D or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in intensityFeatures Output	SubType
Volume at intensity fraction	TenPercentVolumeFraction2D	"2D"
	TenPercentVolumeFraction3D	"3D"
	NinetyPercentVolumeFraction2D	"2D"
	NinetyPercentVolumeFraction3D	"3D"
Intensity at volume fraction	TenPercentIntensityFraction2D	"2D"
	TenPercentIntensityFraction3D	"3D"
	NinetyPercentIntensityFraction2D	"2D"
	NinetyPercentIntensityFraction3D	"3D"
Volume fraction difference between intensity fractions	VolumeFractionDifference2D	"2D"
	VolumeFractionDifference3D	"3D"
Intensity fraction difference between volume fractions	IntensityFractionDifference2D	"2D"
	IntensityFractionDifference3D	"3D"

Texture Features

Compute texture features using the textureFeatures function. To compute all categories of texture features listed in this section, specify Type as "all".

Grey Level Co-occurrence Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "GLCM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

For GLCM features with 2D resampling, the textureFeatures function computes the features with both these aggregations.

• Averaged — Features are computed from each 2D directional matrix for each 2D slice, and then averaged over 2D directions and 2D slices.

• Slice-merged — Features are computed after merging 2D directional matrices for each 2D slice, and then averaged over 2D slices.

For GLCM features with 2.5D resampling, the textureFeatures function computes the features with both these aggregations.

• Direction-merged — Features are computed after merging 2D slices for each 2D direction, and then averaged over 2D directions.

• Merged — Features are computed after merging 2D slices for all 2D directions.

For GLCM features with 3D resampling, the textureFeatures function computes the features with both these aggregations.

• Averaged— Features are computed from each 3D directional matrix, and then averaged over 3D directions.

• Merged — Features are computed after merging 3D directional matrices.

IBSI Feature	Corresponding Feature in textureFeatures Output	Aggregation	SubType
Joint maximum	JointMaximumAveraged2D	Averaged	"2D"
	JointMaximumSliceMerged2D	Slice-merged
	JointMaximumDirectionMerged25D	Direction-merged	"2.5D"
	JointMaximumMerged25D	Merged
	JointMaximumAveraged3D	Averaged	"3D"
	JointMaximumMerged3D	Merged
Joint average	JointAverageAveraged2D	Averaged	"2D"
	JointAverageSliceMerged2D	Slice-merged
	JointAverageDirectionMerged25D	Direction-merged	"2.5D"
	JointAverageMerged25D	Merged
	JointAverageAveraged3D	Averaged	"3D"
	JointAverageMerged3D	Merged
Joint variance	JointVarianceAveraged2D	Averaged	"2D"
	JointVarianceSliceMerged2D	Slice-merged
	JointVarianceDirectionMerged25D	Direction-merged	"2.5D"
	JointVarianceMerged25D	Merged
	JointVarianceAveraged3D	Averaged	"3D"
	JointVarianceMerged3D	Merged
Joint entropy	JointEntropyAveraged2D	Averaged	"2D"
	JointEntropySliceMerged2D	Slice-merged
	JointEntropyDirectionMerged25D	Direction-merged	"2.5D"
	JointEntropyMerged25D	Merged
	JointEntropyAveraged3D	Averaged	"3D"
	JointEntropyMerged3D	Merged
Difference average	DifferenceAverageAveraged2D	Averaged	"2D"
	DifferenceAverageSliceMerged2D	Slice-merged
	DifferenceAverageDirectionMerged25D	Direction-merged	"2.5D"
	DifferenceAverageMerged25D	Merged
	DifferenceAverageAveraged3D	Averaged	"3D"
	DifferenceAverageMerged3D	Merged
Difference variance	DifferenceVarianceAveraged2D	Averaged	"2D"
	DifferenceVarianceSliceMerged2D	Slice-merged
	DifferenceVarianceDirectionMerged25D	Direction-merged	"2.5D"
	DifferenceVarianceMerged25D	Merged
	DifferenceVarianceAveraged3D	Averaged	"3D"
	DifferenceVarianceMerged3D	Merged
Difference entropy	DifferenceEntropyAveraged2D	Averaged	"2D"
	DifferenceEntropySliceMerged2D	Slice-merged
	DifferenceEntropyDirectionMerged25D	Direction-merged	"2.5D"
	DifferenceEntropyMerged25D	Merged
	DifferenceEntropyAveraged3D	Averaged	"3D"
	DifferenceEntropyMerged3D	Merged
Sum average	SumAverageAveraged2D	Averaged	"2D"
	SumAverageSliceMerged2D	Slice-merged
	SumAverageDirectionMerged25D	Direction-merged	"2.5D"
	SumAverageMerged25D	Merged
	SumAverageAveraged3D	Averaged	"3D"
	SumAverageMerged3D	Merged
Sum variance	SumVarianceAveraged2D	Averaged	"2D"
	SumVarianceSliceMerged2D	Slice-merged
	SumVarianceDirectionMerged25D	Direction-merged	"2.5D"
	SumVarianceMerged25D	Merged
	SumVarianceAveraged3D	Averaged	"3D"
	SumVarianceMerged3D	Merged
Sum entropy	SumEntropyAveraged2D	Averaged	"2D"
	SumEntropySliceMerged2D	Slice-merged
	SumEntropyDirectionMerged25D	Direction-merged	"2.5D"
	SumEntropyMerged25D	Merged
	SumEntropyAveraged3D	Averaged	"3D"
	SumEntropyMerged3D	Merged
Angular second moment	AngularSecondMomentAveraged2D	Averaged	"2D"
	AngularSecondMomentSliceMerged2D	Slice-merged
	AngularSecondMomentDirectionMerged25D	Direction-merged	"2.5D"
	AngularSecondMomentMerged25D	Merged
	AngularSecondMomentAveraged3D	Averaged	"3D"
	AngularSecondMomentMerged3D	Merged
Contrast	ContrastAveraged2D	Averaged	"2D"
	ContrastSliceMerged2D	Slice-merged
	ContrastDirectionMerged25D	Direction-merged	"2.5D"
	ContrastMerged25D	Merged
	ContrastAveraged3D	Averaged	"3D"
	ContrastMerged3D	Merged
Dissimilarity	DissimilarityAveraged2D	Averaged	"2D"
	DissimilaritySliceMerged2D	Slice-merged
	DissimilarityDirectionMerged25D	Direction-merged	"2.5D"
	DissimilarityMerged25D	Merged
	DissimilarityAveraged3D	Averaged	"3D"
	DissimilarityMerged3D	Merged
Inverse difference	InverseDifferenceAveraged2D	Averaged	"2D"
	InverseDifferenceSliceMerged2D	Slice-merged
	InverseDifferenceDirectionMerged25D	Direction-merged	"2.5D"
	InverseDifferenceMerged25D	Merged
	InverseDifferenceAveraged3D	Averaged	"3D"
	InverseDifferenceMerged3D	Merged
Normalised inverse difference	NormalisedInverseDifferenceAveraged2D	Averaged	"2D"
	NormalisedInverseDifferenceSliceMerged2D	Slice-merged
	NormalisedInverseDifferenceDirectionMerged25D	Direction-merged	"2.5D"
	NormalisedInverseDifferenceMerged25D	Merged
	NormalisedInverseDifferenceAveraged3D	Averaged	"3D"
	NormalisedInverseDifferenceMerged3D	Merged
Inverse difference moment	InverseDifferenceMomentAveraged2D	Averaged	"2D"
	InverseDifferenceMomentSliceMerged2D	Slice-merged
	InverseDifferenceMomentDirectionMerged25D	Direction-merged	"2.5D"
	InverseDifferenceMomentMerged25D	Merged
	InverseDifferenceMomentAveraged3D	Averaged	"3D"
	InverseDifferenceMomentMerged3D	Merged
Normalised inverse difference moment	NormalisedInverseDifferenceMomentAveraged2D	Averaged	"2D"
	NormalisedInverseDifferenceMomentSliceMerged2D	Slice-merged
	NormalisedInverseDifferenceMomentDirectionMerged25D	Direction-merged	"2.5D"
	NormalisedInverseDifferenceMomentMerged25D	Merged
	NormalisedInverseDifferenceMomentAveraged3D	Averaged	"3D"
	NormalisedInverseDifferenceMomentMerged3D	Merged
Inverse variance	InverseVarianceAveraged2D	Averaged	"2D"
	InverseVarianceSliceMerged2D	Slice-merged
	InverseVarianceDirectionMerged25D	Direction-merged	"2.5D"
	InverseVarianceMerged25D	Merged
	InverseVarianceAveraged3D	Averaged	"3D"
	InverseVarianceMerged3D	Merged
Correlation	CorrelationAveraged2D	Averaged	"2D"
	CorrelationSliceMerged2D	Slice-merged
	CorrelationDirectionMerged25D	Direction-merged	"2.5D"
	CorrelationMerged25D	Merged
	CorrelationAveraged3D	Averaged	"3D"
	CorrelationMerged3D	Merged
Autocorrelation	AutoCorrelationAveraged2D	Averaged	"2D"
	AutoCorrelationSliceMerged2D	Slice-merged
	AutoCorrelationDirectionMerged25D	Direction-merged	"2.5D"
	AutoCorrelationMerged25D	Merged
	AutoCorrelationAveraged3D	Averaged	"3D"
	AutoCorrelationMerged3D	Merged
Cluster tendency	ClusterTendencyAveraged2D	Averaged	"2D"
	ClusterTendencySliceMerged2D	Slice-merged
	ClusterTendencyDirectionMerged25D	Direction-merged	"2.5D"
	ClusterTendencyMerged25D	Merged
	ClusterTendencyAveraged3D	Averaged	"3D"
	ClusterTendencyMerged3D	Merged
Cluster shade	ClusterShadeAveraged2D	Averaged	"2D"
	ClusterShadeSliceMerged2D	Slice-merged
	ClusterShadeDirectionMerged25D	Direction-merged	"2.5D"
	ClusterShadeMerged25D	Merged
	ClusterShadeAveraged3D	Averaged	"3D"
	ClusterShadeMerged3D	Merged
Cluster prominence	ClusterProminenceAveraged2D	Averaged	"2D"
	ClusterProminenceSliceMerged2D	Slice-merged
	ClusterProminenceDirectionMerged25D	Direction-merged	"2.5D"
	ClusterProminenceMerged25D	Merged
	ClusterProminenceAveraged3D	Averaged	"3D"
	ClusterProminenceMerged3D	Merged
Information correlation 1	InformationCorrelation1Averaged2D	Averaged	"2D"
	InformationCorrelation1SliceMerged2D	Slice-merged
	InformationCorrelation1DirectionMerged25D	Direction-merged	"2.5D"
	InformationCorrelation1Merged25D	Merged
	InformationCorrelation1Averaged3D	Averaged	"3D"
	InformationCorrelation1Merged3D	Merged
Information correlation 2	InformationCorrelation2Averaged2D	Averaged	"2D"
	InformationCorrelation2SliceMerged2D	Slice-merged
	InformationCorrelation2DirectionMerged25D	Direction-merged	"2.5D"
	InformationCorrelation2Merged25D	Merged
	InformationCorrelation2Averaged3D	Averaged	"3D"
	InformationCorrelation2Merged3D	Merged

Grey Level Run Length Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "GLRLM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

For GLRLM features with 2D resampling, the textureFeatures function computes the features with both these aggregations.

• Averaged — Features are computed from each 2D directional matrix for each 2D slice, and then averaged over 2D directions and 2D slices.

• Slice-merged — Features are computed after merging 2D directional matrices for each 2D slice, and then averaged over 2D slices.

For GLRLM features with 2.5D resampling, the textureFeatures function computes the features with both these aggregations.

• Direction-merged — Features are computed after merging 2D slices for each 2D direction, and then averaged over 2D directions.

• Merged — Features are computed after merging 2D slices for all 2D directions.

For GLRLM features with 3D resampling, the textureFeatures function computes the features with both these aggregations.

• Averaged— Features are computed from each 3D directional matrix, and then averaged over 3D directions.

• Merged — Features are computed after merging 3D directional matrices.

IBSI Feature	Corresponding Feature in textureFeatures Output	Aggregation	SubType
Short runs emphasis	ShortRunsEmphasisAveraged2D	Averaged	"2D"
	ShortRunsEmphasisSliceMerged2D	Slice-merged
	ShortRunsEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	ShortRunsEmphasisMerged25D	Merged
	ShortRunsEmphasisAveraged3D	Averaged	"3D"
	ShortRunsEmphasisMerged3D	Merged
Long runs emphasis	LongRunsEmphasisAveraged2D	Averaged	"2D"
	LongRunsEmphasisSliceMerged2D	Slice-merged
	LongRunsEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	LongRunsEmphasisMerged25D	Merged
	LongRunsEmphasisAveraged3D	Averaged	"3D"
	LongRunsEmphasisMerged3D	Merged
Low grey level run emphasis	LowGrayLevelRunEmphasisAveraged2D	Averaged	"2D"
	LowGrayLevelRunEmphasisSliceMerged2D	Slice-merged
	LowGrayLevelRunEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	LowGrayLevelRunEmphasisMerged25D	Merged
	LowGrayLevelRunEmphasisAveraged3D	Averaged	"3D"
	LowGrayLevelRunEmphasisMerged3D	Merged
High grey level run emphasis	HighGrayLevelRunEmphasisAveraged2D	Averaged	"2D"
	HighGrayLevelRunEmphasisSliceMerged2D	Slice-merged
	HighGrayLevelRunEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	HighGrayLevelRunEmphasisMerged25D	Merged
	HighGrayLevelRunEmphasisAveraged3D	Averaged	"3D"
	HighGrayLevelRunEmphasisMerged3D	Merged
Short run low grey level emphasis	ShortRunLowGrayLevelEmphasisAveraged2D	Averaged	"2D"
	ShortRunLowGrayLevelEmphasisSliceMerged2D	Slice-merged
	ShortRunLowGrayLevelEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	ShortRunLowGrayLevelEmphasisMerged25D	Merged
	ShortRunLowGrayLevelEmphasisAveraged3D	Averaged	"3D"
	ShortRunLowGrayLevelEmphasisMerged3D	Merged
Short run high grey level emphasis	ShortRunHighGrayLevelEmphasisAveraged2D	Averaged	"2D"
	ShortRunHighGrayLevelEmphasisSliceMerged2D	Slice-merged
	ShortRunHighGrayLevelEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	ShortRunHighGrayLevelEmphasisMerged25D	Merged
	ShortRunHighGrayLevelEmphasisAveraged3D	Averaged	"3D"
	ShortRunHighGrayLevelEmphasisMerged3D	Merged
Long run low grey level emphasis	LongRunLowGrayLevelEmphasisAveraged2D	Averaged	"2D"
	LongRunLowGrayLevelEmphasisSliceMerged2D	Slice-merged
	LongRunLowGrayLevelEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	LongRunLowGrayLevelEmphasisMerged25D	Merged
	LongRunLowGrayLevelEmphasisAveraged3D	Averaged	"3D"
	LongRunLowGrayLevelEmphasisMerged3D	Merged
Long run high grey level emphasis	LongRunHighGrayLevelEmphasisAveraged2D	Averaged	"2D"
	LongRunHighGrayLevelEmphasisSliceMerged2D	Slice-merged
	LongRunHighGrayLevelEmphasisDirectionMerged25D	Direction-merged	"2.5D"
	LongRunHighGrayLevelEmphasisMerged25D	Merged
	LongRunHighGrayLevelEmphasisAveraged3D	Averaged	"3D"
	LongRunHighGrayLevelEmphasisMerged3D	Merged
Grey level non-uniformity	GrayLevelNonUniformityAveraged2D	Averaged	"2D"
	GrayLevelNonUniformitySliceMerged2D	Slice-merged
	GrayLevelNonUniformityDirectionMerged25D	Direction-merged	"2.5D"
	GrayLevelNonUniformityMerged25D	Merged
	GrayLevelNonUniformityAveraged3D	Averaged	"3D"
	GrayLevelNonUniformityMerged3D	Merged
Normalised grey level non-uniformity	NormalisedGrayLevelNonUniformityAveraged2D	Averaged	"2D"
	NormalisedGrayLevelNonUniformitySliceMerged2D	Slice-merged
	NormalisedGrayLevelNonUniformityDirectionMerged25D	Direction-merged	"2.5D"
	NormalisedGrayLevelNonUniformityMerged25D	Merged
	NormalisedGrayLevelNonUniformityAveraged3D	Averaged	"3D"
	NormalisedGrayLevelNonUniformityMerged3D	Merged
Run length non-uniformity	RunLengthNonUniformityAveraged2D	Averaged	"2D"
	RunLengthNonUniformitySliceMerged2D	Slice-merged
	RunLengthNonUniformityDirectionMerged25D	Direction-merged	"2.5D"
	RunLengthNonUniformityMerged25D	Merged
	RunLengthNonUniformityAveraged3D	Averaged	"3D"
	RunLengthNonUniformityMerged3D	Merged
Normalised run length non-uniformity	NormalisedRunLengthNonUniformityAveraged2D	Averaged	"2D"
	NormalisedRunLengthNonUniformitySliceMerged2D	Slice-merged
	NormalisedRunLengthNonUniformityDirectionMerged25D	Direction-merged	"2.5D"
	NormalisedRunLengthNonUniformityMerged25D	Merged
	NormalisedRunLengthNonUniformityAveraged3D	Averaged	"3D"
	NormalisedRunLengthNonUniformityMerged3D	Merged
Run percentage	RunPercentageAveraged2D	Averaged	"2D"
	RunPercentageSliceMerged2D	Slice-merged
	RunPercentageDirectionMerged25D	Direction-merged	"2.5D"
	RunPercentageMerged25D	Merged
	RunPercentageAveraged3D	Averaged	"3D"
	RunPercentageMerged3D	Merged
Grey level variance	GrayLevelVarianceAveraged2D	Averaged	"2D"
	GrayLevelVarianceSliceMerged2D	Slice-merged
	GrayLevelVarianceDirectionMerged25D	Direction-merged	"2.5D"
	GrayLevelVarianceMerged25D	Merged
	GrayLevelVarianceAveraged3D	Averaged	"3D"
	GrayLevelVarianceMerged3D	Merged
Run length variance	RunLengthVarianceAveraged2D	Averaged	"2D"
	RunLengthVarianceSliceMerged2D	Slice-merged
	RunLengthVarianceDirectionMerged25D	Direction-merged	"2.5D"
	RunLengthVarianceMerged25D	Merged
	RunLengthVarianceAveraged3D	Averaged	"3D"
	RunLengthVarianceMerged3D	Merged
Run entropy	RunEntropyAveraged2D	Averaged	"2D"
	RunEntropySliceMerged2D	Slice-merged
	RunEntropyDirectionMerged25D	Direction-merged	"2.5D"
	RunEntropyMerged25D	Merged
	RunEntropyAveraged3D	Averaged	"3D"
	RunEntropyMerged3D	Merged

Grey Level Size Zone Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "GLSZM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in textureFeatures Output	SubType
Small zone emphasis	SmallZoneEmphasis2D	"2D"
	SmallZoneEmphasis25D	"2.5D"
	SmallZoneEmphasis3D	"3D"
Large zone emphasis	LargeZoneEmphasis2D	"2D"
	LargeZoneEmphasis25D	"2.5D"
	LargeZoneEmphasis3D	"3D"
Low grey level zone emphasis	LowGrayLevelZoneEmphasis2D	"2D"
	LowGrayLevelZoneEmphasis25D	"2.5D"
	LowGrayLevelZoneEmphasis3D	"3D"
High grey level zone emphasis	HighGrayLevelZoneEmphasis2D	"2D"
	HighGrayLevelZoneEmphasis25D	"2.5D"
	HighGrayLevelZoneEmphasis3D	"3D"
Small zone low grey level emphasis	SmallZoneLowGrayLevelEmphasis2D	"2D"
	SmallZoneLowGrayLevelEmphasis25D	"2.5D"
	SmallZoneLowGrayLevelEmphasis3D	"3D"
Small zone high grey level emphasis	SmallZoneHighGrayLevelEmphasis2D	"2D"
	SmallZoneHighGrayLevelEmphasis25D	"2.5D"
	SmallZoneHighGrayLevelEmphasis3D	"3D"
Large zone low grey level emphasis	LargeZoneLowGrayLevelEmphasis2D	"2D"
	LargeZoneLowGrayLevelEmphasis25D	"2.5D"
	LargeZoneLowGrayLevelEmphasis3D	"3D"
Large zone high grey level emphasis	LargeZoneHighGrayLevelEmphasis2D	"2D"
	LargeZoneHighGrayLevelEmphasis25D	"2.5D"
	LargeZoneHighGrayLevelEmphasis3D	"3D"
Grey level non-uniformity	GrayLevelNonUniformity2D	"2D"
	GrayLevelNonUniformity25D	"2.5D"
	GrayLevelNonUniformity3D	"3D"
Normalised grey level non-uniformity	NormalisedGrayLevelNonUniformity2D	"2D"
	NormalisedGrayLevelNonUniformity25D	"2.5D"
	NormalisedGrayLevelNonUniformity3D	"3D"
Zone size non-uniformity	ZoneSizeNonUniformity2D	"2D"
	ZoneSizeNonUniformity25D	"2.5D"
	ZoneSizeNonUniformity3D	"3D"
Normalised zone size non-uniformity	NormalisedZoneSizeNonUniformity2D	"2D"
	NormalisedZoneSizeNonUniformity25D	"2.5D"
	NormalisedZoneSizeNonUniformity3D	"3D"
Zone percentage	ZonePercentage2D	"2D"
	ZonePercentage25D	"2.5D"
	ZonePercentage3D	"3D"
Grey level variance	GrayLevelVariance2D	"2D"
	GrayLevelVariance25D	"2.5D"
	GrayLevelVariance3D	"3D"
Zone size variance	ZoneSizeVariance2D	"2D"
	ZoneSizeVariance25D	"2.5D"
	ZoneSizeVariance3D	"3D"
Zone size entropy	ZoneSizeEntropy2D	"2D"
	ZoneSizeEntropy25D	"2.5D"
	ZoneSizeEntropy3D	"3D"

Grey Level Distance Zone Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "GLDZM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in textureFeatures Output	SubType
Small distance emphasis	SmallDistanceEmphasis2D	"2D"
	SmallDistanceEmphasis25D	"2.5D"
	SmallDistanceEmphasis3D	"3D"
Large distance emphasis	LargeDistanceEmphasis2D	"2D"
	LargeDistanceEmphasis25D	"2.5D"
	LargeDistanceEmphasis3D	"3D"
Low grey level zone emphasis	LowGrayLevelDistanceZoneEmphasis2D	"2D"
	LowGrayLevelDistanceZoneEmphasis25D	"2.5D"
	LowGrayLevelDistanceZoneEmphasis3D	"3D"
High grey level zone emphasis	HighGrayLevelDistanceZoneEmphasis2D	"2D"
	HighGrayLevelDistanceZoneEmphasis25D	"2.5D"
	HighGrayLevelDistanceZoneEmphasis3D	"3D"
Small distance low grey level emphasis	SmallDistanceLowGrayLevelEmphasis2D	"2D"
	SmallDistanceLowGrayLevelEmphasis25D	"2.5D"
	SmallDistanceLowGrayLevelEmphasis3D	"3D"
Small distance high grey level emphasis	SmallDistanceHighGrayLevelEmphasis2D	"2D"
	SmallDistanceHighGrayLevelEmphasis25D	"2.5D"
	SmallDistanceHighGrayLevelEmphasis3D	"3D"
Large distance low grey level emphasis	LargeDistanceLowGrayLevelEmphasis2D	"2D"
	LargeDistanceLowGrayLevelEmphasis25D	"2.5D"
	LargeDistanceLowGrayLevelEmphasis3D	"3D"
Large distance high grey level emphasis	LargeDistanceHighGrayLevelEmphasis2D	"2D"
	LargeDistanceHighGrayLevelEmphasis25D	"2.5D"
	LargeDistanceHighGrayLevelEmphasis3D	"3D"
Grey level non-uniformity	GrayLevelDistanceNonUniformity2D	"2D"
	GrayLevelDistanceNonUniformity25D	"2.5D"
	GrayLevelDistanceNonUniformity3D	"3D"
Normalised grey level non-uniformity	NormalisedGrayLevelDistanceNonUniformity2D	"2D"
	NormalisedGrayLevelDistanceNonUniformity25D	"2.5D"
	NormalisedGrayLevelDistanceNonUniformity3D	"3D"
Zone distance non-uniformity	ZoneDistanceNonUniformity2D	"2D"
	ZoneDistanceNonUniformity25D	"2.5D"
	ZoneDistanceNonUniformity3D	"3D"
Normalised zone distance non-uniformity	NormalisedZoneDistanceNonUniformity2D	"2D"
	NormalisedZoneDistanceNonUniformity25D	"2.5D"
	NormalisedZoneDistanceNonUniformity3D	"3D"
Zone percentage	ZoneDistancePercentage2D	"2D"
	ZoneDistancePercentage25D	"2.5D"
	ZoneDistancePercentage3D	"3D"
Grey level variance	GrayLevelDistanceVariance2D	"2D"
	GrayLevelDistanceVariance25D	"2.5D"
	GrayLevelDistanceVariance3D	"3D"
Zone distance variance	ZoneDistanceVariance2D	"2D"
	ZoneDistanceVariance25D	"2.5D"
	ZoneDistanceVariance3D	"3D"
Zone distance entropy	ZoneDistanceEntropy2D	"2D"
	ZoneDistanceEntropy25D	"2.5D"
	ZoneDistanceEntropy3D	"3D"

Neighbourhood Grey Tone Difference Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "NGTDM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in textureFeatures Output	SubType
Coarseness	Coarseness2D	"2D"
	Coarseness25D	"2.5D"
	Coarseness3D	"3D"
Contrast	Contrast2D	"2D"
	Contrast25D	"2.5D"
	Contrast3D	"3D"
Busyness	Busyness2D	"2D"
	Busyness25D	"2.5D"
	Busyness3D	"3D"
Complexity	Complexity2D	"2D"
	Complexity25D	"2.5D"
	Complexity3D	"3D"
Strength	Strength2D	"2D"
	Strength25D	"2.5D"
	Strength3D	"3D"

Neighbouring Grey Level Dependence Based Features

To compute only these texture features, when using the textureFeatures function, specify Type as "NGLDM". You can compute only the 2D, 2.5D, or 3D features by specifying the corresponding SubType, or specify SubType as "all" to compute all listed features.

IBSI Feature	Corresponding Feature in textureFeatures Output	SubType
Low dependence emphasis	LowDependenceEmphasis2D	"2D"
	LowDependenceEmphasis25D	"2.5D"
	LowDependenceEmphasis3D	"3D"
High dependence emphasis	HighDependenceEmphasis2D	"2D"
	HighDependenceEmphasis25D	"2.5D"
	HighDependenceEmphasis3D	"3D"
Low grey level count emphasis	LowGrayLevelCountEmphasis2D	"2D"
	LowGrayLevelCountEmphasis25D	"2.5D"
	LowGrayLevelCountEmphasis3D	"3D"
High grey level count emphasis	HighGrayLevelCountEmphasis2D	"2D"
	HighGrayLevelCountEmphasis25D	"2.5D"
	HighGrayLevelCountEmphasis3D	"3D"
Low dependence low grey level emphasis	LowDependenceLowGrayLevelEmphasis2D	"2D"
	LowDependenceLowGrayLevelEmphasis25D	"2.5D"
	LowDependenceLowGrayLevelEmphasis3D	"3D"
Low dependence high grey level emphasis	LowDependenceHighGrayLevelEmphasis2D	"2D"
	LowDependenceHighGrayLevelEmphasis25D	"2.5D"
	LowDependenceHighGrayLevelEmphasis3D	"3D"
High dependence low grey level emphasis	HighDependenceLowGrayLevelEmphasis2D	"2D"
	HighDependenceLowGrayLevelEmphasis25D	"2.5D"
	HighDependenceLowGrayLevelEmphasis3D	"3D"
High dependence high grey level emphasis	HighDependenceHighGrayLevelEmphasis2D	"2D"
	HighDependenceHighGrayLevelEmphasis25D	"2.5D"
	HighDependenceHighGrayLevelEmphasis3D	"3D"
Grey level non-uniformity	GrayLevelDependenceNonUniformity2D	"2D"
	GrayLevelDependenceNonUniformity25D	"2.5D"
	GrayLevelDependenceNonUniformity3D	"3D"
Normalised grey level non-uniformity	NormalisedGrayLevelDependenceNonUniformity2D	"2D"
	NormalisedGrayLevelDependenceNonUniformity25D	"2.5D"
	NormalisedGrayLevelDependenceNonUniformity3D	"3D"
Dependence count non-uniformity	DependenceCountNonUniformity2D	"2D"
	DependenceCountNonUniformity25D	"2.5D"
	DependenceCountNonUniformity3D	"3D"
Normalised dependence count non-uniformity	NormalisedDependenceCountNonUniformity2D	"2D"
	NormalisedDependenceCountNonUniformity25D	"2.5D"
	NormalisedDependenceCountNonUniformity3D	"3D"
Dependence count percentage	DependenceCountPercentage2D	"2D"
	DependenceCountPercentage25D	"2.5D"
	DependenceCountPercentage3D	"3D"
Grey level variance	GrayLevelDependenceVariance2D	"2D"
	GrayLevelDependenceVariance25D	"2.5D"
	GrayLevelDependenceVariance3D	"3D"
Dependence count variance	DependenceCountVariance2D	"2D"
	DependenceCountVariance25D	"2.5D"
	DependenceCountVariance3D	"3D"
Dependence count entropy	DependenceCountEntropy2D	"2D"
	DependenceCountEntropy25D	"2.5D"
	DependenceCountEntropy3D	"3D"
Dependence count energy	DependenceCountEnergy2D	"2D"
	DependenceCountEnergy25D	"2.5D"
	DependenceCountEnergy3D	"3D"