Table 2.
Dose to the organs at risk (OAR) in IMRT treatment plans (57.6 Gy total dose)
| Parameter | CT-MRI (Gy, median, range) |
CT-MRI-PET (Gy, median, range) |
p-value |
|---|---|---|---|
| Brain Stem | |||
| Dmax | 55.1 (47.0–58.1) | 54.7 (43.2–58.72 | 0.013* |
| Dmedian | 13.4 (3.0–21.3) | 10.33 (2.8–22.4 | 0.241 |
| Optic Chiasm | |||
| Dmax | 53.1(7.3–57.9) | 51.8 (4.2–57.5) | 0.032* |
| Dmedian | 42.6 (3.36–51.0) | 41.0 (2.8–53.5) | 0.007* |
| Left optic nerve | |||
| Dmax | 54.5 (5.9–58.7) | 53.6 (2.3–58.6) | 0.036* |
| Dmedian | 42.4 (2.2–55.6) | 35.3 (1.5–55.7) | 0.017* |
| Right optic nerve | |||
| Dmax | 52.1 (1.8–56.7) | 51.2 (1.6–57.3) | 0.037* |
| Dmedian | 33.7 (0.9–54.5) | 28.1 (0.9–54.2) | 0.013* |
*Significant difference <0.05