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KMID : 0357520170400020289
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Journal of Radiological Science and Technology
2017 Volume.40 No. 2 p.289 ~ p.295
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Bolus Effect to Reduce Skin Dose of the Contralateral Breast During Breast Cancer Radiation Therapy
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Won Yeong-Jin
Kim Jong-Won
Kim Jung-Hoon
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Abstract
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The aim of this study was to evaluate the dose comparison using Radon phantom with 5 mm and 10 mm tissue equivalent materials, FIF, Wedge(15, 30 angle) and IMRT, to reduce the skin dose of the contralateral breast during breast cancer radiation therapy(Total dose: 50.4Gy). The dose was measured for each treatment plan by attaching to the 8 point of the contralateral breast of the treated region using a optical-stimulated luminance dosimeter(OSLD) as a comparative dose evaluation method. Of the OSLD used in the study, 10 were used with reproducibility within 3%. As a result, the average reduction rates of 5 mm and 10 mm in the FIF treatment plan were 37.23 cGy and 41.77 cGy, respectively, and the average reduction rates in the treatment plan using Wedge 15° were 70.69 cGy and 87.57 cGy, respectively. The IMRT showed a reduction of 67.37 cGy and 83.17 cGy, respectively. The results of using bolus showed that as the thickness of the bolus increased in all treatments, the dose reduction increased. We concluded that mastectomy as well as general radiotherapy for breast cancer would be very effective for patients who are more likely to be exposed to scattered radiation due to a more demanding or complex treatment plan.
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KEYWORD
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Breast cancer , Radiotherapy , Reduction of skin dose , Optical-Stimulated Luminance Dosimeter(OSLD) , Bolus
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