Course book Advanced Treatment Planning 2018

Meningioma RT – Organs At Risk constraints

Organ Clinical Constraint

Organ

Alpha:beta ratio

PBT [IMRT]

Brainstem D2% < 63 Gy [< 58 Gy]

Brainstem

2.5

Brainstem center

Brainstem center

2.5

D2% < 54 Gy [=]

Spinal cord

Spinal cord

0.89

D2% < 63 Gy [< 58 Gy]

Spinal cord center

Spinal cord center

0.89

D2% < 54 Gy [=]

Opticus L/R

Opticus L/R

1.6

D2% < 56 Gy [=]

Chiasm

D2% < 56 Gy [=]

Chiasm

1.6

Bulbus L/R

Bulbus L/R D2% < 45 Gy, Dmean < 30 Gy

Brain

2.9

NB constraints apply to 39#