Influence of 68Ga-DOTATOC on sparing of normal tissue for radiation therapy of skull base meningioma: differential impact of photon and proton radiotherapy

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
D_max	55.1 (47.0–58.1)	54.7 (43.2–58.72	0.013*
D_median	13.4 (3.0–21.3)	10.33 (2.8–22.4	0.241
Optic Chiasm
D_max	53.1(7.3–57.9)	51.8 (4.2–57.5)	0.032*
D_median	42.6 (3.36–51.0)	41.0 (2.8–53.5)	0.007*
Left optic nerve
D_max	54.5 (5.9–58.7)	53.6 (2.3–58.6)	0.036*
D_median	42.4 (2.2–55.6)	35.3 (1.5–55.7)	0.017*
Right optic nerve
D_max	52.1 (1.8–56.7)	51.2 (1.6–57.3)	0.037*
D_median	33.7 (0.9–54.5)	28.1 (0.9–54.2)	0.013*

ISSN: 1748-717X