Table 2.
Characteristics of anatomic and metabolic imaging volumes
| Imaging variable (cm3) | Median (range) |
|---|---|
| Preradiation therapy | |
| MTV | 4.9 (0-43.8) |
| GTV-Gd | 38.0 (8.0-81.5) |
| GTV-FLAIR | 73.2 (9.7-206.2) |
| Enhancing MTV | 4.2 (0-32.8) |
| Nonenhancing MTV | 1.2 (0-24.5) |
| MTV outside 95% IDS | 0 (0-3.6) |
| 3 mo | |
| MTV at 3 mo | 0.1 (0-18.0) |
| Change in MTV from baseline | –2.7 (–41.4-0.1) |
| Persistent MTV subvolume | 1.5 (0.0-10.9) |
Abbreviations: IDS = isodose surface; GTV-FLAIR = volume of fluid-attenuated inversion recovery intensity; GTV-Gd = gadolinium-enhanced gross tumor volume; MTV = metabolic tumor volume.