| 肺介质中光子剂量算法在不同能量下的计算精度差异 |
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| 引用本文： | 宾石珍,邱小平,杨振,吕知平.肺介质中光子剂量算法在不同能量下的计算精度差异[J].南华大学学报(自然科学版),2011,25(2):6-9. |
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| 作者姓名： | 宾石珍 邱小平 杨振 吕知平 |
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| 作者单位： | 1. 南华大学核科学技术学院,湖南衡阳,421001
2. 中南大学湘雅医院肿瘤科物理室,湖南长沙,410008 |
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| 摘 要： | 建立一包含肺介质的水模体,分别用笔形束(Pencil Beam,PB)算法、卷积叠加(Convolution-superposition,CS)算法和蒙特卡罗(Monte Carlo,MC)模拟计算1 cm×1 cm到7 cm×7 cm射野条件下,6 MV和15 MV光子在该模体中的百分深度剂量和离轴比,并以MC模拟为标准比较其计算误差.结果表明肺介质中,笔形束算法计算精度总体上随能量的增加降低,卷积叠加算法计算精度受能量影响不大.
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| 关 键 词： | 笔形束算法 卷积叠加算法 蒙特卡罗模拟 计算精度 |
| 收稿时间： | 2011/4/22 0:00:00 |
Difference of the Calculation Accuracy by Various Photon DoseAlgorithms Under Different Energy in Lung Density Media |
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| BIN Shi-zhen,QIU Xiao-ping,YANG Zhen,LV Zhi-ping.Difference of the Calculation Accuracy by Various Photon DoseAlgorithms Under Different Energy in Lung Density Media[J].Journal of Nanhua University:Science and Technology,2011,25(2):6-9. |
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| Authors: | BIN Shi-zhen QIU Xiao-ping YANG Zhen LV Zhi-ping |
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| Institution: | BIN Shi-zhen1,QIU Xiao-ping1,YANG Zhen2,LV Zhi-ping2 (1.School of Nuclear Science and Technology,University of South China,Hengyang,Hunan 421001,China,2.Department of Oncology,Xiangya Hospital of Central-south University,Changsha,Hunan 410008,China) |
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| Abstract: | A water phantom with a lung density slab was built, in which the depth dose （DD） and off-axis ratio （OAR） of field 1 cmx 1 cm to field 7 cm x 7 cm were calculated by PB algorithms,CS algorithms and Monte Carlo （MC）simulation under 6 MV and 15 MV photon, and their calculation error were evaluated by the standard of MC simulated results. The results show that in lung density media, the calculation accuracy of PB algorithms in- creases with the energy reduction as a whole in lung density media. The CS algorithm accu- racy has little effect by the energy. |
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| Keywords: | pencil beam algorithm convolution-superposition algorithm monte carlo simu-lation calculation accuracy |
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