| Clinac iX和Trilogy加速器束流匹配计划验证分析 |
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| 引用本文： | 王广善,刘桂梅,李晓波,李祥勇,张旭.Clinac iX和Trilogy加速器束流匹配计划验证分析[J].中国医学物理学杂志,2021,0(1):15-20. |
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| 作者姓名： | 王广善 刘桂梅 李晓波 李祥勇 张旭 |
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| 作者单位： | 首都医科大学附属北京胸科医院放射治疗科， 北京 101149 |
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| 摘 要： | 通过对束流匹配的加速器进行计划设计，比较计划参数，验证交叉执行的差异及通过率，验证束流匹配的可行性及可靠性。选取头颈、胸部和腹盆部共15例病例，分别设计Clinac iX和Trilogy两个不同治疗机的三维适形计划（3D-CRT）；另选头颈、胸部和腹盆部共15例病例，分别设计两个不同治疗机的调强计划（IMRT）。比较相同计划类型不同治疗机的计划差异，评价指标包括靶区PTV的D98%、D2%、Dmax，晶体Dmax、脑干Dmax、左右肺V5 Gy、双肺V20 Gy、脊髓Dmax、膀胱D50%、小肠D2 cc、股骨头V40 Gy等危及器官及治疗机跳数MU。并对治疗机执行计划进行点剂量和面剂量验证。PTV的D98%、D2%、Dmax剂量差异最大平均值标准差分别为-0.52%±0.30%、0.53%±0.45%、-0.55%±0.17%，危及器官剂量差异最大平均值为膀胱D50%（0.94%±0.84%）；Clinac iX和Trilogy治疗机执行所有计划的最大绝对剂量偏差分别为2.36%和-2.80%。MatriXX和PV的γ验证通过率结果平均值分别在97.00%和96.00%以上，Clinac iX最小值为95.40%，Trilogy最小值为95.90%。两台经过束流匹配的治疗机之间交换执行计划的剂量学偏差在临床可接受的范围内，各项参数能精准执行，必要时可以在两台治疗机之间交换执行计划，保证病人放疗疗程完整。
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| 关 键 词： | 加速器 束流匹配 交叉执行 计划验证 γ分析 |
The verification analysis of beam-matched plans between Clinac iX and Trilogy linacs |
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| WANG Guangshan,LIU Guimei,LI Xiaobo,LI Xiangyong,ZHANG Xu.The verification analysis of beam-matched plans between Clinac iX and Trilogy linacs[J].Chinese Journal of Medical Physics,2021,0(1):15-20. |
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| Authors: | WANG Guangshan LIU Guimei LI Xiaobo LI Xiangyong ZHANG Xu |
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| Affiliation: | Department of Radiation Oncology, Beijing Chest Hospital Affiliated to Capital Medical University, Beijing101149, China |
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| Abstract: | A beam-matched plan was designed firstly for the two linacs.Then the parameters of the plan were compared,the differences andγpass rate of the swapping treatment was identified,with an aim to verify the possibility and reliability of beam matching.15 cases including g head&neck,thorax and pelvis were selected to design two 3 D-CRT plans with Clinac IX and Trilogy respectively.Another 15 cases containing head&neck,thorax and pelvis were selected to design two IMRT plans with Clinac i X and Trilogy respectively.The same type of plan was compared in different machines.Evaluation parameters include PTV D98%,D2%,Dmaxand OAR(Organ At Risk)(lens Dmax,brain stem Dmax,left or right lung V5 Gy,two lungs V20 Gy,spinal cord Dmax,bladder D50%,small intestine D2 cc,femoral head V40 Gy,et al)and MU.Absolute and relative dosimetry were derived when plan were delivered on accelerators.The maximum average number and standard deviation of PTV D98%,D2%,Dmaxand OAR(bladder D50%)were-0.52%±0.30%,0.53%±0.45%,-0.55%±0.17%,0.94%±0.84%respectively.The maximum absolute dosimetric deviations of Clinac iX and Trilogy executing plans were 2.36%and-2.80%.The averageγpass rate of planar verification of Matri XX and PV were greater than 97.00%and 96.00%respectively.The minimum for iX and TR were 95.40%and 95.90%respectively.Because various parameters were accurately delivered,the dosimetric deviation of swapping plans between beam-matched machines was clinically acceptable.If necessary,it was feasible to shift patients to other plans without any modification and re-planning between two beammatched linacs to ensure integrality of patient’s treatment course. |
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| Keywords: | linacs beam matching swapping plan verification analysis ofγ |
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