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KMID : 1164220120240010011
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Journal of Korean Society for Radiotherapeutic Technology
2012 Volume.24 No. 1 p.11 ~ p.14
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Study on Computerized Treatment Plan of Field-in-Field Intensity Modulated Radiation Therapy and Conventional Radiation Therapy according to PBC Algorithm and AAA on Breast Cancer Tangential Beam
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Yeom Mi-Suk
Bae Seong-Soo
Kim Dae-Sup
Back Geum-Mun
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Abstract
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Purpose: Anisotropic Analytical Algorithm (AAA) provides more accurate dose calculation regarding impact on scatter and tissue inhomogeneity in comparison to Pencil Beam Convolution (PBC) algorithm. This study tries to analyze the difference of dose distribution according to PBC algorithm and dose calculation algorithm of AAA on breast cancer tangential plan.
Materials and Methods: Computerized medical care plan using Eclipse treatment planning system (version 8.9, VARIAN, USA) has been established for the 10 breast cancer patients using 6 MV energy of Linac (CL-6EX, VARIAN, USA). After treatment plan of Conventional Radiation Therapy plan (Conventional plan) and Field-in-Field Intensity Modulated Radiation Therapy plan (FiF plan) using PBC algorithm has been established, MU has been fixed, implemented dose calculation after changing it to AAA, and compared and analyzed treatment plan using Dose Volume Histogram (DVH).
Results: Firstly, as a result of evaluating PBC algorithm of Conventional plan and the difference according to AAA, the average difference of CI value on target volume has been highly estimated by 0.295 on PBC algorithm and as a result of evaluating dose of lung, V₄?Gy and V₄?Gy has been highly evaluated by 5.83% and 4.04% each, Mean dose V₂?Gy, V?Gy, V₃Gy has been highly evaluated 0.6%, 0.29%, 6.35%, 10.23% each on AAA. Secondly, in case of FiF plan, the average difference of CI value on target volume has been highly evaluated on PBC algorithm by 0.165, and dose on ipsilateral lung, V₄?Gy, V₄?Gy Mean dose has been highly evaluated 6.17%, 3.80%, 0.15% each on PBC algorithm V₂?Gy, V?Gy, V₃Gy has been highly evaluated 0.14%, 4.07%, 4.35% each on AAA.
Conclusion: When calculating with AAA on breast cancer tangential plan, compared to PBC algorithm, Conformity on target volume of Conventional plan, FiF plan has been less evaluated by 0.295, 0.165 each. For the reason that dose of high dose region of ipsilateral lung has been showed little amount, and dose of low dose region has been showed much amount, features according to dose calculation algorithm need to be considered when we evaluate dose for the lungs.
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KEYWORD
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pencil beam convolution (PBC), anisotropic analytical algorithm (AAA), dose volume histogram (DVH), conformity index (CI)
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