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KMID : 1164220140260010091
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 1 p.91 ~ p.98
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Usefulness evaluation of Hybrid planning through dosimetric comparision of Three Dimensinal Conformal Radiation Radiotherapy and Hybrid planning for left breast cancer
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Chae Moon-Ki
Park Byung-Soo
Ahn Jong-Ho
Song Gi-Won
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Abstract
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Purpose : To compare the dosimetry for the left breast cancer treatment between three dimensional conformal radiation
radiotherapy (3D-CRT) and Hybrid planning and to estimate usefulness of Hybrid planning
Materials and Methods : Five patients with left breast cancer were included in the study. They were planned using several
different radiotherapy techniques including: 1)open rectangular field, 2)tangential wedge-based field 3)field in field, 4)hybrid
planning(energy, wedge combine). For each patient planning was using Light Speed RT-16 CT and PINNACLE planning
system-ver.9.2. Hybrid plan was made using same system and using the same targets and optimization goals. We comparing the Homogeneity Index(HI), normal organs at the does-volume histogram(DVH)
Results : In all plans, the Homogeneity Index(HI) of Hybrid planning was significantly better than other. Dose comparison of HI=2D-RT:38.32, TW:38.32, FIF:29.22, HYBRID:30.57. 2D-RT, TW, FIF Hybrid V75_lung=112.33, 125.14, 121.3, 123.78. V50_lung=155.43, 159.62, 157.96, 159.06. V25_lung=199.86, 200.22, 198.65, 200.31. V50_heart=26.07, 27.1, 26.85, 27.17 V30_heart=33.71, 34.37, 34.15, 34.65
Conclusion : In summary, 3D-CRT, Hybrid planning techniques were found to have acceptableCTV coverage in our study.
However the Hybrid planning increased radiation dose exposure to normal tissue. If you apply for treatment of nhomogeneity areas like lung, For best results will be achieved.
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KEYWORD
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field in field, hybrid, 3D-CRT, DVH, breast cancer
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