Table 3. Semi-quantitative metrics derived from initial FDG-PET.
| EWS | OST | |||||
|---|---|---|---|---|---|---|
| Average | Min | Max | Average | Min | Max | |
| SUVmax1 | 7.7 | 1.6 | 18.4 | 12.7 | 4.9 | 35.3 |
| SUVpeak1 | 5.7 | 1.3 | 14.2 | 9.5 | 3.6 | 26.4 |
| SUVmean1 | 3.8 | 0.9 | 9.5 | 5.4 | 2.5 | 13.8 |
| TLG1 | 527.2 | 7.5 | 3249.7 | 570.7 | 60.9 | 2089.4 |
| MTV1 | 115.2 | 3.6 | 469.6 | 104.0 | 10.4 | 262.2 |
| Homogeneity | 0.211 | 0.127 | 0.311 | 0.224 | 0.137 | 0.390 |
| Entropy | 6.188 | 3.865 | 7.314 | 6.564 | 5.12 | 7.212 |
| Dissimilarity | 9.438 | 4.327 | 17.765 | 8.424 | 3.546 | 14.898 |
| HGRE | 483.488 | 278.577 | 834.277 | 368.766 | 84.055 | 763.521 |
| ZLNU | 810.604 | 23.256 | 3389 | 698.094 | 145.73 | 1971.981 |
| SZHGE | 416.971 | 239.241 | 751.213 | 319.019 | 121.414 | 693.061 |
| Sphericity | 0.439 | 0.284 | 0.557 | 0.403 | 0.217 | 0.62 |
| Elongation | 1.489 | 1.072 | 3.302 | 1.561 | 1.016 | 2.884 |
| Compactness | 0.091 | 0.023 | 0.173 | 0.079 | 0.01 | 0.239 |
EWS: Ewing sarcoma; OST: Osteosarcoma; SUV: Standard Uptake Value; TLG: Total Lesion Glycolysis MTV: Metabolic tumor volume; HGRE: High Grey Level Run Emphasis; SZHGE: Short-Zone High Gray-level Emphasis; ZNLU: Zone Length Non Uniformity