- 作者：Vladimir Valakh ; M.D.&lowast ; ; vladimir@valakh.com ; Yongbok Kim ; Ph.D.&lowast ; ; &dagger ; ; E. Day Werts ; Ph.D.&lowast ; ; &dagger ; ; Mark G. Trombetta ; M.D.&lowast ; ; &dagger ;
- 关键词：Cardiac dose ; Heart ; High-dose-rate brachytherapy ; Balloon ; MammoSite ; Contura
- 刊名：International Journal of Radiation Oncology*Biology*Physics
- 出版年：2012
- 出版时间：1 April, 2012
- 年：2012
- 卷：82
- 期：5
- 页码：1698-1705
- 全文大小：693 K
Purpose
To investigate radiation dose to the heart in 60 patients with left-sided breast cancer who were treated with balloon-based high-dose-rate brachytherapy using MammoSite or Contura applicators.Methods and Materials
We studied 60 consecutive women with breast cancer who were treated with 34 Gy in 10 twice-daily fractions using MammoSite (n?= 37) or Contura (n?= 23) applicators. The whole heart and the left and right ventricles were retrospectively delineated, and dose-volume histograms were analyzed. Multiple dosimetrics were reported, such as mean dose (Dmean); relative volume receiving 1.7, 5, 10, and 20 Gy (V1.7, V5, V10, and V20, respectively); dose to 1 cc (D1cc); and maximum point dose (Dmax). Biologic metrics, biologically effective dose and generalized equivalent uniform dose were computed. The impact of lumpectomy cavity location on cardiac dose was investigated.
Results
The average ¡À standard deviation of Dmean was 2.45 ¡À 0.94 Gy (range, 0.56-4.68) and 3.29 ¡À 1.28 Gy (range, 0.77-6.35) for the heart and the ventricles, respectively. The average whole heart V5 and V10 values were 10.2 % and 1.3 % , respectively, and the heart Dmax was >20 Gy in 7 of 60 (11.7 % ) patients and >25 Gy in 3 of 60 (5 % ) patients. No cardiac tissue received ?0 Gy. The V1.7, V5, V10, V20, and Dmean values were all higher for the ventricles than for the whole heart. For balloons located in the upper inner quadrant of the breast, the average whole heart Dmean was highest. The Dmean, biologically effective dose, and generalized equivalent uniform dose values for heart and ventricles decreased with increasing minimal distance from the surface of the balloon.
Conclusions
On the basis of these comprehensive cardiac dosimetric data, we recommend that cardiac dose be?routinely reported and kept as low as possible in balloon-based high-dose-rate brachytherapy treatment planning for patients with left-sided breast cancer so the correlation with future cardiac toxicity data can be investigated.