Research Article

[Retracted] Severity Assessment of COVID-19 Using a CT-Based Radiomics Model

Table 1

Description of the selected radiomic features and their associated feature types and filters.

Radiomic featuresAssociated_filtersTypes

Logarithm_firstorder_SkewnessLogarithmFirst order
Logarithm_firstorder_KurtosisLogarithmFirst order
Llogarithm_glcm_InverseVarianceLogarithmGLCM
Original_shape_SphericityOriginalSHAPE
Exponential_gldm_DependenceEntropyExponentialGLDM
Gradient_gldm_LowGrayLevelEmphasisGradientGLDM
Gradient_glrlm_ShortRunLowGrayLevelEmphasisGradientGLRLM
Original_shape_Maximum2DDiameterSliceOriginalSHAPE
Exponential_glcm_CorrelationExponentialGLCM
Wavelet-HLL_ngtdm_ComplexityWavelet-HLLNGTDM
Gradient_ngtdm_ComplexityGradientNGTDM
Wavelet-LHH_gldm_GrayLevelNonUniformityWavelet-LHHGLDM
Squareroot_glcm_ContrastSquarerootGLCM
lbp-2D_gldm_DependenceEntropylbp-2DGLDM
lbp-3D-m1_gldm_DependenceEntropylbp-3D-m1GLDM
Original_ngtdm_BusynessOriginalNGTDM
lbp-3D-m2_gldm_DependenceEntropylbp-3D-m2GLDM
lbp-3D-k_gldm_HighGrayLevelEmphasislbp-3D-kGLDM
lbp-3D-k_gldm_LowGrayLevelEmphasislbp-3D-kGLDM
lbp-3D-k_glcm_MaximumProbabilitylbp-3D-kGLCM
lbp-3D-k_glrlm_ShortRunEmphasislbp-3D-kGLRLM
lbp-3D-k_glcm_Autocorrelationlbp-3D-kGLCM
lbp-3D-k_ngtdm_Contrastlbp-3D-kNGTDM
lbp-3D-k_glcm_ClusterProminencelbp-3D-kGLCM
Wavelet-LLL_glcm_InverseVarianceWavelet-LLLGLCM
lbp-3D-k_glrlm_ShortRunHighGrayLevelEmphasislbp-3D-kGLRLM
Wavelet-LLL_glcm_MCCWavelet-LLLGLCM
Wavelet-HLH_glszm_ZonePercentageWavelet-HLHGLSZM
Wavelet-HLH_gldm_SmallDependenceEmphasisWavelet-HLHGLDM
Wavelet-HLH_glcm_MCCWavelet-HLHGLCM
Wavelet-HLH_glszm_SmallAreaEmphasisWavelet-HLHGLSZM
Wavelet-LLH_firstorder_SkewnessWavelet-LLHFirst order
Wavelet-HHH_firstorder_10PercentileWavelet-HHHFirst order
Wavelet-LLL_gldm_DependenceVarianceWavelet-LLLGLDM
lbp-3D-k_firstorder_Skewnesslbp-3D-kFirst order
Wavelet-HHL_ngtdm_ComplexityWavelet-HHLNGTDM
Wavelet-LLH_firstorder_MeanWavelet-LLHFirst order
Wavelet-LHH_ngtdm_BusynessWavelet-LHHNGTDM

GLCM: grey-level cooccurrence matrix; GLRLM: grey-level run length matrix; GLSZM: grey-level size zone matrix; NGTDM: neighboring grey-tone difference matrix; GLDM: grey-level dependence matrix.