| 影响调强放疗绝对剂量的主要因素及应对措施 |
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| 引用本文： | 姜瑞瑶,熊霏,黄国锋,曹征,李兆斌,傅深. 影响调强放疗绝对剂量的主要因素及应对措施[J]. 中国医学物理学杂志, 2008, 25(5) |
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| 作者姓名： | 姜瑞瑶 熊霏 黄国锋 曹征 李兆斌 傅深 |
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| 作者单位： | 上海交大附属第六人民医院,肿瘤放疗科,上海,200233 |
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| 摘 要： | 目的:验证调强放射治疗的绝对剂量误差,探索影响调强放疗绝对剂量的因素及其应对措施.方法:将20例准备实施调强放疗病人的实际治疗计划,用标准水模体进行计划移植,生成验证计划并计算体模内电离室测量点的计划剂量,执行验证计划的照射,用电离室进行实际物理绝对剂量测量,计算实际测量剂量值和计划剂量值的百分相对误差.分析影响调强放疗绝对剂量误差的主要因素,采取相应改进措施,验证另80例调强放疗的绝对剂量,比较前20例与改进后80例调强放疗绝对剂量验证结果.结果:前20例调强放疗绝对剂量百分相对误差分布范围是-8.00%～5.00%,平均误差为-2.01%,标准差为3.55%.采取相应改进措施后,80例调强放疗绝对剂量百分相对误差全部在4.4%以内,分布范围缩小到-4.4%～2.5%,平均误差为-1.49%,比前20例平均误差下降25.9%,标准差为1.40%,比前20例下降60.6%.结论:分析影响调强放疗绝对剂量的因素,采取必要的应对措施,能够有效提高调强放射治疗绝对剂量的准确性.
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| 关 键 词： | 调强放射治疗 绝对剂量 验证 |
Main Influent Factors on Absolute Dose of Intensity-Modulated Radiation Therapy and Countermeasures |
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| JIANG Rui-yao,XIONG Fei,HUANG Guo-feng,CAO Zheng,LI Zhao-bin,FU Shen. Main Influent Factors on Absolute Dose of Intensity-Modulated Radiation Therapy and Countermeasures[J]. Chinese Journal of Medical Physics, 2008, 25(5) |
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| Authors: | JIANG Rui-yao XIONG Fei HUANG Guo-feng CAO Zheng LI Zhao-bin FU Shen |
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| Affiliation: | JIANG Rui-yao,XIONG Fei,HUANG Guo-feng,CAO Zheng,LI Zhao-bin,FU Shen(Department of Radiation Oncology,6th People,s Hospital,Jiaotong University,Shanghai 200233,China) |
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| Abstract: | Objective: To verify the absolute dose accuracy of IMRT and explore the Main influent factors on absolute dose of intensity-modulated radiated therapy and countermeasures.Methods: Conducting hybrid plans using phantom geometry and 20 cases patient's incident beam fluence for IMRT.Irradiation dose were measured by ionization chamber to verify the absolute dose accuracy of IMRT,calculate the relative difference between measured dose and planned dose.Analyzing the main influent factors on absolute dose of IMRT... |
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| Keywords: | intensity-modulated radiated therapy absolute dose verification |
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