We hypothesize that for large pendulous breasts, breast irradiation in supine and prone position are equivalent with regard to coverage of the PTV, but with a better dose homogeneity in prone position and a smaller radiation exposure of lung and heart.The purpose of this study is to compare the 3-D dose distribution in PTV(Planning Target Volume) and normal tissues in prone position versus supine position.
Age range
18 Years
Sex
FEMALE
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Dose Homogeneity 1: PTV
Timeframe: 1 day after treatment planning
Dose Homogeneity 2: V105% and V107%
Timeframe: 1 day after treatment planning
Dose Homogeneity 3: V95 %
Timeframe: 1 day after treatment planning