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Table 1 Relative contribution from head compensator, leakage and internal scatter to the dose to various organs.

From: Doses to internal organs for various breast radiation techniques - implications on the risk of secondary cancers and cardiomyopathy

Technique Breast wedges Breast IMRT
  Internal scatter Compensator Head leakage Internal scatter Head leakage
Contralateral breast 11.7% 87.8% 0.5% 95.6% 4.4%
Spleen 34.7% 64.7% 0.5% 98.5% 1.5%
Ipsilateral lung 18.7% 79.2% 2.1% 90.1% 9.9%
Heart (anterior 1/3) 38.9% 60.1% 1.0% 97.6% 2.4%