Table 2.

Mean doses (range) to neurocognitive organs at risk represented as percentage of the prescribed treatment dose.

Technique	Hippocampus (%)	SVZ (%)	Neurocognitive OAR (%)
	CTV V95 = 98%
Protons	77.0 (71.0–80.6)	79.2 (71.6–87.0)	78.0 (71.3–81.1)
IMRT	89.7 (87.0–92.7)	90.5 (86.5–93.3)	90.0 (86.9–93.0)
IMAT	97.2 (95.9–98.4)	98.7 (96.6–101.7)	97.8 (96.2–99.8)
Opposing fields	98.0 (97.2–99.3)	100.4 (99.4–101.3)	99.2 (98.9–100.0)
	CTV V95 = 95%
Protons	41.9 (25.9–50.3)	42.7 (27.4–51.5)	42.3 (26.6–51.2)
IMRT	77.1 (72.5–81.1)	77.2 (70.6–81.5)	77.1 (71.5–81.3)
IMAT	87.1 (82.9–89.4)	89.6 (84.3–94.2)	88.3 (83.6–91.0)
Opposing fields	98.0 (97.2–99.3)	100.4 (99.4–101.3)	99.2 (98.9–100.0)

Note: The neurocognitive OAR dose was taken as the average dose of the hippocampus and the SVZ.