Table 2.
Second-order radiomic texture features serving as the basis for the delta-radiomics texture features.
| Matrix encoding class (IBSI/aggregation code) | Radiomic texture feature (IBSI code) |
|---|---|
| GLCM (LFYI/IAZD) | Contrast (ACUI) |
| Dissimilarity (8S9J) | |
| Homogeneity (IB1Z) | |
| Correlation (NI2N) | |
| Energy (8ZQL)* | |
| Variance (UR99) | |
| Entropy (TU9B) | |
| Sum average (ZGXS) | |
| GLRLM (TPOI/IAZD) | Short run emphasis (220V) |
| Long run emphasis (W4KF) | |
| Gray-level non-uniformity (R5YN)* | |
| Run length non-uniformity (W92Y)* | |
| Run percentage (9ZK5) | |
| Low gray-level run emphasis (V3SW) | |
| High gray-level run emphasis (G3QZ) | |
| Short run low gray-level emphasis (HTZT) | |
| Short run high gray-level emphasis (GD3A) | |
| Long run low gray-level emphasis (IVPO) | |
| Long run high gray-level emphasis (3KUM) | |
| Gray-level variance (8CE5) | |
| Run length variance (8CE5) | |
| GLSZM (9SAK/KOBO) | Small zone emphasis (5QRC) |
| Large zone emphasis (48P8) | |
| Gray-level non-uniformity (JNSA) | |
| Zone-size non-uniformity (4JP3) | |
| Zone percentage (P30P) | |
| Low gray-level zone emphasis (XMSY) | |
| High gray-level zone emphasis (5GN9) | |
| Small zone low gray-level emphasis (5RAI) | |
| Small zone high gray-level emphasis (HW1V) | |
| Large zone low gray-level emphasis (YH51) | |
| Large zone high gray-level emphasis (J17V) | |
| Gray-level variance (BYLV) | |
| Zone-size variance (BYLV) | |
| NGTDM (IPET/KOBO) | Coarseness (QCDE)* |
| Contrast (65HE) | |
| Busyness (NQ30)* | |
| Complexity (HDEZ) | |
| Strength (1X9X) |
GLCM, gray-level co-occurrence matrix; GLRLM, gray-level run length matrix; GLSZM, gray-level size zone matrix; NGTDM, neighborhood gray tone difference matrix; IBSI, is the Image Biomarker Standardization Initiative. Features marked with * were IBSI features modified to decrease volume independence (39).