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Table 1 Organ at risk dose constraints used for treatment plans

From: Whole brain radiotherapy with adjuvant or concomitant boost in brain metastasis: dosimetric comparison between helical and volumetric IMRT technique

Organ at risk Dose constraints
  SIB SRS
Brain (without PTV) Dmean ≤ 32 Gy
V35 Gy < 15 %
V40 Gy < 5 %
V45 Gy < 0 %
V12Gy < 10 cc
Brainstem Dmax < 35Gy Excluded
Chiasm Dmax < 35Gy Excluded
Optic nerve Dmax < 35Gy Excluded
Lens Dmax < 5 Gy Dmax < 5 Gy