Table 2.
Differences in naming conventions defined by the IBSI across the radiomic software. ID, inverse difference; GLCM, grey-level co-occurrence matrix; HU, Hounsfield Unit; NGLDM, neighborhood grey-level different matrix; NGTDM, neighboring grey tone difference matrix
| Feature | IBSI terminology | LIFEx | IBEX | PyRadiomics | CERR |
|---|---|---|---|---|---|
| Volume | Volume (mesh) and volume (voxel counting) | Volume | Volume | Mesh volume and voxel volume | Volume |
| Sphericity | Sphericity | Sphericity | Sphericity | Sphericity | Sphericity |
| Area | Surface area (mesh) | Surface area | Surface area | Surface area | Surface area |
| Skewness | Discretised intensity skewness | Histogram skewness | Intensity histogram skewness | First-order skewness | Skewness |
| GLCM correlation | GLCM correlation | GLCM correlation | GLCM correlation | GLCM correlation | GLCM correlation |
| GLCM contrast | GLCM contrast | GLCM contrast = variance | GLCM contrast | GLCM contrast | GLCM contrast |
| GLCM angular Second moment | GLCM angular Second moment | GLCM energy = angular second moment | GLCM energy | GLCM joint energy | GLCM joint energy |
| GLCM joint entropy | GLCM joint entropy | GLCM entropy Log2 = joint entropy | GLCM entropy | GLCM joint entropy | GLCM joint entropy |
| GLCM difference average | GLCM difference average | GLCM dissimilarly | GLCM dissimilarly | GLCM difference average | Dissimilarity (difference average) |
| GLCM inverse difference | GLCM inverse difference | GLCM homogeneity = inverse difference | GLCM homogeneity | GLCM ID | GLCM inverse difference |
| NGTDM busyness | NGTDM busyness | NGLDM busyness | Neighbour intensity difference busyness | NGTDM busyness | NGTDM busyness |
| NGTDM coarseness | NGTDM coarseness | NGLDM coarseness | Neighbour intensity difference coarseness | NGTDM coarseness | NGTDM coarseness |
| NGTDM contrast | NGTDM contrast | NGLDM contrast | Neighbour intensity difference contrast | NGTDM contrast | NGTDM contrast |
| Minimum | Minimum intensity | Conventional HU minimum | Global Minimum | First-order minimum | Minimum |
| Maximum | Maximum intensity | Conventional HU maximum | Global maximum | First-order maximum | Maximum |
| Mean | Mean intensity | Conventional HU mean | Global mean | First-order mean | Mean |
| Standard deviation | Not defined (variance is defined) | Conventional HU standard deviation | Global standard deviation | First-order standard deviation | Standard deviation |