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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