Table 2.
List of radiomics features extracted by Pyradiomics in this study, for first-, second, and high-order features. GLCM: Gray-level co-occurrence matrix, GLSZM: gray-level size zone matrix, GLRLM: gray-level run length matrix, NGTDM: neighboring gray tone difference matrix, GLDM: gray-level dependence matrix
| First order | GLCM | GLSZM |
|---|---|---|
| Interquartile range | Joint average | Gray-level variance |
| Skewness | Sum average | Zone variance |
| Uniformity | Joint entropy | Gray-level non-uniformity normalized |
| Median | Cluster shade | Size zone non-uniformity normalized |
| Energy | Maximum probability | Size zone non-uniformity |
| Robust mean absolute deviation | Idmn | Gray-level non-uniformity |
| Mean absolute deviation | Joint energy | Large area emphasis |
| Total energy | Contrast | Small area high gray-level emphasis |
| Root mean squared | Difference entropy | Zone percentage |
| 90percentile | Inverse variance | Large area low gray-level emphasis |
| Entropy | Difference variance | Large area high gray-level emphasis |
| Range | Idn | High gray-level zone emphasis |
| Variance | Idm | Small area emphasis |
| 10percentile | Correlation | Low gray-level zone emphasis |
| Kurtosis | Autocorrelation | Zone entropy |
| Mean | Sum entropy | Small area low gray-level emphasis |
| GLRLM | MCC | GLDM |
|---|---|---|
| Short-run low gray-level emphasis | Sum squares | Gray-level variance |
| Gray-level variance | Cluster prominence | High gray-level emphasis |
| Low gray-level run emphasis | Imc2 | Dependence entropy |
| Gray-level non-uniformity normalized | Imc1 | Dependence non-uniformity |
| Run variance | Difference average | Gray-level non-uniformity |
| Gray-level non-uniformity | Id | Small dependence emphasis |
| Long-run emphasis | Cluster tendency | Small dependence high gray-level emphasis |
| Short-run high gray-level emphasis | NGTDM | Dependence non-uniformity normalized |
| Run length non-uniformity | Coarseness | Large dependence emphasis |
| Short-run emphasis | Complexity | Large dependence low gray-level emphasis |
| Long-run high gray-level emphasis | Strength | Dependence variance |
| Run percentage | Contrast | Large dependence high gray-level emphasis |
| Long-run low gray-level emphasis | Busyness | Small dependence low gray-level emphasis |
| Run entropy | Low gray-level emphasis | |
| High gray-level run emphasis | ||
| Run length non-uniformity normalized |