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Table 1 Proton plans characteristics for the considered patient cases, as extracted from the TPS. The dose per fraction, number of fractions and number of beams are reported. The table also provides information on the angles between beams and the OARs taken into account for the optimization

From: Proton and helium ion radiotherapy for meningioma tumors: a Monte Carlo-based treatment planning comparison

Patient

Planned dose/fraction [Gy(RBE)]

Number of fractions

Number of beams

Angles between beams [°]

Critical organ at risks

A

1,8

29

2

180

Temporal lobes (left/right)

Brain stem

Optical system

B

1,8

30

2

75

Brain stem

Chiasma

Optic nerves (left/right)

Intra-auricular nerve (right)

C

1,8

30

2

32

Brain stem

Chiasma

Optic nerve (right)

D

1,8

28

1

\

Optic nerve (left)

Eye (left)