| 张彦秋,邱小平*,杨振,吕知平.用蒙特卡罗模拟评估小野条件下骨介质中AAA算法的精度[J].南华大学学报(自然科学版),2011,25(4):29~34.[ZHANG Yan-qiu1,QIU Xiao-ping1*,YANG Zhen2,LV Zhi-ping2.Evaluating the Calculation Accuracy of AAA Algorithm for theSituation with Small Fields in Bone by Monte Carlo[J].Journal of University of South China(Science and Technology),2011,25(4):29~34.] |
| 用蒙特卡罗模拟评估小野条件下骨介质中AAA算法的精度 |
| Evaluating the Calculation Accuracy of AAA Algorithm for theSituation with Small Fields in Bone by Monte Carlo |
| 投稿时间：2011-09-22 |
| DOI： |
| 中文关键词: 各向异性分析算法 蒙特卡罗模拟 骨介质 精度评估 |
| 英文关键词:Anisotropic Analytical Algorithm Monte Carlo simulation bone accuracy evaluation |
| 基金项目: |
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| 摘要点击次数: 953 |
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| 中文摘要: |
| 用蒙特卡罗模拟评估放射治疗剂量计算使用的各向异性分析算法（Anisotropic Analytical Algorithm，AAA)在小野条件下骨介质中的计算精度.建立一包含骨介质的水模体，分别用AAA算法、PBC算法（作为对比）和蒙特卡罗（Monte Carlo,MC）模拟计算2 cm×2 cm到8 cm×8 cm射野条件下该模体中的深度剂量和离轴比，并以MC模拟为标准比较深度剂量，用一维伽马分析对离轴比进行分析.结果显示，与MC模拟的结果相比，AAA算法与PBC算法均高估了骨介质区域的剂量，高估的剂量偏差范围分别为2.16%～２.7%、1.4%～２.03%.AAA算法与PBC算法均低估了(PBC算法2 cm×2 cm射野除外)肺介质后区域的剂量，低估的剂量偏差范围分别为-0.39%～-1.19%、-0.13%～-0.4%.AAA算法和PBC算法分别略高估了射野内边缘和外边缘的剂量.一维伽马分析显示AAA算法和PBC算法（以MC模拟结果为基准）在2 cm×2 cm到8 cm×8 cm射野，通过率分别为100%、100%、100%、86% ，100%、100%、72%、64%.总之，AAA算法在骨介质中剂量计算的结果略高于MC模拟的结果，与PBC算法相比，计算精度没有显示出明显的优势. |
| 英文摘要: |
| In order to evaluate the calculation accuracy of Anisotropic Analytical Algorithm （AAA）for the situation with small fields in a water-bone phantom using Monte Carlo simu-lation as benchmarks.A water phantom with a bone slab was built,in which the depth dose (DD) and off-axis ratio (OAR) for field 2 cm×2 cm to field 8 cm×8 cm were calculated by AAA algorithms,PBC algorithms(as comparison),and Monte Carlo (MC) simulation.The evaluation of algorithms by MC simulation was achieved by the comparisons of DD and the 1 dimension gamma analysis of OAR.It was shown that both of AAA algorithm and PBC algorithm overestimated the DD in bone region,and the dose differences ranged from 2.16%～2.7%,1.4%～２.03%,respectively.AAA algorithm and PBC algorithm underestimated the DD in back of bone region,and the dose differences ranged from -0.39%～-1.19%,-0.13%～-0.4%,respectively.AAA algorithm and PBC algorithm overestimated the dose of field inner edge and field outer edge,respectively.One dimension gamma analysis indicated that AAA algorithm and PBC algorithm gamma pass rate was 100%,100%,100%,86%，100%,100%,72%,64%,respectively.In bone medium,the dose calculated by AAA was slightly higher than MC simulation,the calculation accuracy was not evidently higher than PBC. |
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