Volumetric modulated arc therapy (VMAT) for hippocampal-avoidance whole brain radiation therapy: planning comparison with Dual-arc and Split-arc partial-field techniques

Table 1 Dose criteria of RTOG 0933 protocol. Dose prescription of 30 Gy in 10 fractions

RTOG 0933 protocol	Per protocol	Acceptable variation	Unacceptable deviation
Whole brain PTV	D_2% < 37.5 Gy	D_2% = 37.5 Gy	D_2% > 40 Gy
Whole brain PTV	D_98% > 25 Gy	D_98% < 25 Gy	V₃₀ < 90%
Hippocampus	D_100% < 9 Gy	D_100% = 10 Gy	D_100% > 10 Gy
Hippocampus	D_max < 16 Gy	D_max = 17 Gy	D_max > 17 Gy
Optic nerves and optic chiasm	D_max < 37.5 Gy	D_max = 37.5 Gy	D_max > 37.5 Gy

ISSN: 1748-717X