Table 1.

Hypofractionated PBRT characteristics.

	Chordomas (n = 6)	Chondrosarcomas (n = 5)
Total dose	37.5 GyRBE	35 GyRBE
Dose per fraction	7.5 GyRBE	7 GyRBE
Median CTV (range)	32.2 cc (13.7–43.5 cc)	32.5 cc (10.6–47.5 cc)
Median number of beams (range)	4 (4–6)	4 (4–5)
Use of apertures	4 patients	3 patients
Median CTV coverage (range)	D95 = 95% (92.2–99.8%)	D95 = 96% (94.2–98.7%)
Median CTV D99 (range)	39 Gy (39.9–38.8 GyRBE)	36.4 Gy (37–36 GyRBE)
Median D0.03 cc at brainstem (range)	26 Gy (30–24.7 GyRBE)	26.5 Gy (29.1–25.2 GyRBE)
Median D0.03 cc at optic pathway (range)	20.2 Gy (23–8.9 GyRBE)	20.7 Gy (23.6–16.3 GyRBE)