Abstract
11591 Background: At present, partial breast irradiation has been applied for the patients treated by breast-conserving treatment; this study is designed to explore the methods, dosimetric features and short effects of partial breast irradiation carried out by three-dimensional external-beam irradiation assisted by active breathing control (ABC). Methods: Computerized tomography (CT) simulation assisted by active breathing control (ABC) was finished for each patient enrolled to get CT images in condition of 75% deepest inspiration named moderate deep inspiration breath hold (mDIBH). The extent labeled by the silver slips located in the cavity was delineated as gross target volume (GTV), GTV plus the margin of 15mm was defined planning target volume (PTV). Noncoplanar radiation with four three-dimensional conformal fields was employed, the described dose was 34Gy/10f/5d. The percentage of PTV accounted for the affected whole breast, the percentages of PTV included by 100%, 95% and 90% isodose curve, the pe...
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