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題 名 | 蒙地卡羅方法模擬於臨床電子直線加速器之電子射源項參數研究=Parametric Studies of The Electron Source Term in Monte Carlo Simulation on Clinical Linacs |
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作 者 | 紀金輝; 張國平; 蕭安成; 陳信雄; 楊世能; 潘榕光; 梁基安; 趙敏; | 書刊名 | 放射治療與腫瘤學 |
卷 期 | 15:2 2008.06[民97.06] |
頁 次 | 頁129-137 |
分類號 | 416.36 |
關鍵詞 | 蒙地卡羅模擬; 劑量計算; OMEGA/BEAM程式; Monte carlo simulation; Dose calculation; OMEGA/BEAM; |
語 文 | 中文(Chinese) |
中文摘要 | 目的:本研究為利用蒙地卡羅方法模擬直線加速器機頭,並找出適用於Varian Clinac 21EX 6 MV直線加速器機頭之最佳入射電子射束參數。材料及方法:利用OMEGA/BEAM程式將己知的詳細加速器機頭幾何參數搭配上不同的入射電子射束能量與其射束寬度模擬Varian Clinac 21EX 6 MV直線加速器機頭,並加以分析其產生之光子射束劑量分佈,最後訂定一套最佳化入射電子射束參數之找尋方法。結果:利用最佳化之電子射束參數,計算百分深度劑量與徑向劑量分佈,並與實測值進行比較,其百分誤差約小於2%;其中,於百分深度劑量方面,入射電子射束能量影響較大;而於徑向劑量分佈方面,入射電子射束能量與入射電子射束寬度皆有影響。結論:OMEGA/BEAM程式成功建構出適用於Varian Clinac 21EX直線加速器之蒙地卡羅模擬系統。利用本研究訂定之最佳化電子參數找尋方法,可節省大量的參數測試時間。 |
英文摘要 | Purpose: The parameters of electron source term used in Monte Carlo simulation for Varian 21EX 6 MV linac were optimized in this study. Materials and Methods: The detailed geometry of linac head and the parameters of electron source term, i.e., energy and intensity distribution (spot size), were used to simulate the beam output for the Varian 21EX 6 MV photon mode. Calculation results of dose distributions were analyzed to optimize the parameters of electron source term. Results: With the optimum parameters for electron source term, less than 2% discrepancies between the measured and calculated results for both PDDs and dose profiles were observed. The PDDs were mostly affected by the incident electron beam energy, while the dose profiles were affected by both the energy and spot size of the incident electron beam. Conclusion: The OMEGA/BEAM Monte Carlo code was used to calculate the dose distributions for Varian 21EX 6 MV linac. A method was described in this study to optimize the parameters of the electron source term. |
本系統中英文摘要資訊取自各篇刊載內容。