Table 1.
Target Coverage and Brainstem Dosages for Conventional and sMRI-modified RT Plans
| Patient | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | Median | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Target volume coverage (%) of PTV1 by prescription dosage (54 Gy) | Conv_PTV1 | 98.0 | 98.5 | 100.0 | 99.9 | 99.5 | 94.6 | 97.9 | 99.9 | 97.5 | 98.8 | 99.9 | 98.80 |
| sMRI-PTV1 (1.50-fold) | 99.5 | 99.9 | 100.0 | 99.9 | 100.0 | 98.7 | 99.1 | 99.4 | 98.3 | 100.0 | 99.9 | 99.90 | |
| sMRI-PTV1 (1.75-fold) | 99.9 | 100.0 | 100.0 | 99.9 | 99.9 | 98.7 | 99.1 | 96.7 | 98.1 | 100.0 | 99.9 | 99.90 | |
| sMRI-PTV1 (2.0-fold) | 99.9 | 100.0 | 100.0 | 99.9 | 99.7 | 97.8 | 98.8 | 99.2 | 99.1 | 99.7 | 99.9 | 99.70 | |
| Target volume coverage (%) of PTV2 by prescription dosage (60 Gy) | Conv_PTV2 | 98.0 | 96.8 | 97.9 | 86.2 | 98.9 | 96.5 | 98.9 | 98.7 | 89.5 | 99.9 | 99.4 | 98.00 |
| sMRI-PTV2 (1.50-fold) | 91.0 | 93.5 | 95.5 | 83.0 | 94.7 | 94.5 | 95.0 | 94.6 | 80.0 | 95.0 | 95.0 | 94.60 | |
| sMRI-PTV2 (1.75-fold) | 95.0 | 94.9 | 95.0 | 84.0 | 95.4 | 94.3 | 95.0 | 95.0 | 85.1 | 95.1 | 94.1 | 95.00 | |
| sMRI-PTV2 (2.0-fold) | 96.0 | 95.0 | 95.0 | 86.0 | 95.9 | 94.0 | 95.0 | 94.9 | 91.3 | 95.5 | 94.8 | 95.00 | |
| Brainstem maximum dosage (Gy) | Conv_PTV1 | 53.5 | 55.0 | 13.0 | 59.3 | 52.8 | 53.9 | 59.4 | 58.3 | 58.0 | 52.9 | 7.3 | 53.90 |
| sMRI-PTV1 (1.50-fold) | 58.9 | 59.9 | 59.8 | 57.9 | 57.8 | 59.4 | 58.7 | 59.6 | 58.3 | 58.8 | 58.0 | 58.80 | |
| sMRI-PTV1 (1.75-fold) | 58.7 | 58.8 | 58.1 | 58.9 | 58.1 | 59.2 | 59.0 | 59.4 | 59.2 | 58.4 | 58.4 | 58.80 | |
| sMRI-PTV1 (2.0-fold) | 58.7 | 59.2 | 55.4 | 58.2 | 57.8 | 58.7 | 58.6 | 58.9 | 59.3 | 58.7 | 58.2 | 58.70 |
Abbreviations: PTV1, planning target volume 1 (corresponding to PTV51 or PTV54); PTV2, planning target volume 2 (corresponding to PTV60); Conv, conventional.