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Meningioma RT – Organs At Risk constraints
NB constraints apply to 39#
Organ
Alpha:beta ratio
Brainstem
2.5
Brainstem center
2.5
Spinal cord
0.89
Spinal cord center
0.89
Opticus L/R
1.6
Chiasm
1.6
Bulbus L/R
2.9
Organ
Clinical Constraint
PBT [IMRT]
Brainstem
D2% < 63 Gy [< 58 Gy]
Brainstem center
D2% < 54 Gy [=]
Spinal cord
D2% < 63 Gy [< 58 Gy]
Spinal cord center
D2% < 54 Gy [=]
Opticus L/R
D2% < 56 Gy [=]
Chiasm
D2% < 56 Gy [=]
Bulbus L/R
D2% < 45 Gy, Dmean < 30 Gy
Brain