대한방사선치료학회지 (The Journal of Korean Society for Radiation Therapy)
- 제24권1호
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- Pages.11-14
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- 2012
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- 1598-8449(pISSN)
유방암 접선조사에서 PBC 알고리즘과 AAA에 따른 Field-in-Field Intensity Modulated Radiation Therapy와 Conventional Radiation Therapy 전산화 치료계획에 대한 고찰
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
- Yeom, Mi-Suk (Department of Radiation Oncology, Asan Medical Center) ;
- Bae, Seong-Soo (Department of Radiation Oncology, Asan Medical Center) ;
- Kim, Dae-Sup (Department of Radiation Oncology, Asan Medical Center) ;
- Back, Geum-Mun (Department of Radiation Oncology, Asan Medical Center)
- 투고 : 2012.01.19
- 심사 : 2012.03.09
- 발행 : 2012.03.31
초록
목 적: Anisotropic Analytical Algorithm (AAA)는 Pencil Beam Convolution (PBC) 알고리즘에 비하여 2차선과 조직 불 균질에 대한 영향에 보다 더 정확한 선량계산을 제공한다. 본 연구는 유방암 접선조사 치료계획에서 PBC 알고리즘과 AAA의 선량계산 알고리즘에 따른 선량분포의 차이를 분석하고자 한다. 대상 및 방법: 선형가속기(CL-6EX, VARIAN, USA)의 6 MV 에너지를 이용한 유방암 환자 10명을 대상으로 Eclipse treatment planning system (Version 8.9, VARIAN, USA)을 사용하여 전산화 치료계획을 수립하였다. Conventional Radiation Therapy plan(Conventional plan)과 Field-in-Field Intensity Modulated Radiation Therapy plan (FiF plan)을 PBC 알고리즘을 이용하여 치료계획을 수립한 후 Monitor Unit (MU)를 고정시키고 AAA로 변경하여 선량계산하고, Dose Volume Histogram (DVH)을 이용하여 치료계획을 비교 분석하였다. 결 과: 첫 번째, Conventional plan의 PBC 알고리즘과 AAA에 따른 차이를 평가한 결과 치료용적에 대한 평균 Conformity Index (CI) 값의 차이는 PBC 알고리즘에서 0.295 높게 평가 되었다. 동측 폐에 대한 선량을 평가한 결과
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,
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