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Table 3 Suggested dose objectives for organs at risk

From: Fondazione Italiana Linfomi (FIL) expert consensus on the use of intensity-modulated and image-guided radiotherapy for Hodgkin’s lymphoma involving the mediastinum

StructuresRecommendedRequiredAvoid maximum dose in
Heart
Whole organMean < 5 GyMean, 5–15 GyCoronary vessels
Left ventricleMean < 2 GyMean, 5–10 GyCoronary vessels
Breasts (whole breasts)Mean dose < 4 GyV4 < 50%Glandular tissue
Lungs (minus PTV)V5 < 55%V5 55–60% 
V20 < 30%V20 < 35%
Mean dose < 10 GyMean < 13.5 Gy
ThyroidV5 < 93%
V20 < 82%
V25 < 63%
V30 < 62%
2.2 ml < 25 Gy
V25 < 70%Whole thyroid