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Table 1 Dose–volume constraints for target and organs at risk (OARs)

From: The choice of multi-beam IMRT for whole breast radiotherapy in early-stage right breast cancer

Target or OAR	Goal or constraint dose (%)
Planning target volume (PTV)	45 or 47.5 Gy
Heart	V₂₀ < 10 %
Heart	V₃₀ < 3 %
LAD	D_max < 15 Gy
LAD	D_mean < 5 Gy
Ipsilateral lung	V₂₀ < 20 %
Ipsilateral lung	V₅₀ = 0
Contralateral lung	V₅ < 20 %
Contralateral lung	V₁₀ = 0
Contralateral breast	D_mean < 4 Gy
Contralateral breast	D_max < 10 Gy

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