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KMID : 1164220210330010055
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Journal of Korean Society for Radiotherapeutic Technology
2021 Volume.33 No. 1 p.55 ~ p.62
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Comparison of dose-variation in skin due to Set-up error in case of radiation therapy for left breast using Volumetric Modulated Arc Therapy(VMAT)
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Kwon Yong-Jae
Park Ryeung-Hwang
Kim Se-Young
Jung Dong-Min
Baek Jong-Geol
Cho Jeong-Hee
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Abstract
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Purpose: This study aims to contribute to the reduction of complications of breast cancer radiation therapy by analyzing skin dose differences due to Set-up error.
Materials and Method: Pseudo breast was produced using a 3D printer, applied to the phantom, and images were acquired through CT. Treatment plan was carried out that the PTV, which contains 95% of the prescription dose, could be more than 95% of the volume, so that Dmax did not exceed 107% of the prescription dose. The Set-up error was evaluated by applying ±1mm/±3mm/±5mm to the X-axis, Y-axis, and Z-axis.
Results: The dose-variation in skin due to Set-up error was approximately 106% to 123% compared to prescription dose, and the highest dose in skin was 49.24 Gy at 5mm Set-up error in the lateral direction of the X-axis. More than 107% of the prescription dose was the widest at 6.87 cc in skin lateral.
Conclusions: If a Set-up error occurs during left breast cancer VMAT, a great difference in skin dose was shown in the lateral direction of the X-axis. If more effort is made to align the X-axis of the breast treated during CBCT registration, the dose-variation of skin will be reduced.
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KEYWORD
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CBCT, Set-up error, radiation dermatitis, skin dose
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