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Volumes of the dose distribution difference >6 Gy and <−6 Gy in Fig. 4 (cm3)
| LR | AP | SI | ||||
|---|---|---|---|---|---|---|
| NB | DB | NB | DB | NB | DB | |
| ≥6 Gy | 55.9 | 76.7 | 66.3 | 43.5 | 50.3 | 57.1 |
| ≤−6 Gy | 62.8 | 87.0 | 53.4 | 42.6 | 72.4 | 73.1 |
AP, anterior–posterior; LR, left–right; SI, superior–inferior; NB, nonblock; DB, directional block; PTVVTV, planning target volume for the virtual target volume.
