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中华放射肿瘤学杂志
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中华放射肿瘤学杂志  2014, Vol. 23 Issue (5): 422-425    DOI: 10.3760/cma.j.issn.1004-4221.2014.05.015
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应用Octavius体模配合PTW Seven29二维矩阵进行HT计划剂量验证
张富利,王雅棣,刘清智,张伟超,王平
100700 北京军区总医院放疗科(张伟现工作单位245041 黄山市,解放军532医院放疗科)
Evaluation of PTW Seven29 combining Octavius phantom for tomotherapy patient-specific quality assurance
Zhang Fuli, Wang Yadi, Liu Qingzhi, Zhang Weichao,Wang Ping
Department of Radiotherapy, the Military General Hospital of Beijing PLA, Beijing 100700, China
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摘要 目的 研究采用Octavius体模配合PTW Seven29二维探测器阵列对HT系统的调强计划实施剂量验证的可行性。方法 分别对二维矩阵行冠状位和矢状位测量,获取模体中冠状面和矢状面剂量分布。通过HT系统MVCT成像和配准消除床面沉降的影响,确保实现体模和探测器阵列的精确摆位。实施治疗质量保证计划照射后将二维探测器阵列测量获得的平面剂量分布与HT计划系统模体计划计算获得的平面剂量分布进行比较。对12例恶性肿瘤患者采用γ分析法进行HT计划剂量验证。结果 PTW Seven29二维探测器水平、垂直放置,阈值分别为TH5、TH10、TH20、TH30时,采用3%/2 mm、3%/3 mm、3%/4 mm、3%/5 mm标准的γ参数≤1的平均通过率均>91.7%和93.9%。测量所得剂量分布与计算结果在相应平面的几何分布均呈现出良好的一致性。结论
Octavius体模配合PTW Seven29二维探测器阵列用于HT计划验证能获得令人满意结果。
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作者相关文章
张富利
王雅棣
刘清智
张伟超
王平
关键词 螺旋断层放射疗法二维探测器阵列剂量验证质量保证    
Abstract:Objective To investigate the feasibility of dose verification of helical tomotherapy (HT) using the PTW Seven29 2D-ARRAY with Octavius phantom. Methods The 12 patients HT plan were verified with the PTW Seven29 2D-ARRAY combining Octavius phantom. The detector array was guided and registered by MVCT imaging, and measured dose distributions on the corresponding planes were compared with those calculated by the treatment planning system (TPS). Based on several different Gamma criteria, the Gamma analysis method was utilized to evaluate the dose verification. Results According to the different acceptance criteria combination of dose difference/ distance to agreement at different threshold level including 3%/2 mm, 3%/3 mm, 3%/4 mm, 3%/5 mm at TH5, TH10, TH20, TH30, the mean passing rates with γparameter ≤1 were all above 91.7% and 93.9% when PTW Seven29 2D-ARRAY was horizontal and vertical. The dose distribution measured by the 2D-ARRAY combining Octavius phantom was well consistent with that calculated by the TPS. Conclusions 2D-ARRAY with Octavius phantom can get satisfying results when used in HT plan dose verification and is a viable tool to replace traditional film dosimetry system in clinical quality assurance work.
Key words Tomotherapy    PTW Seven29 detector array    Dose verification    Quality assurance   
收稿日期: 2013-08-29     
基金资助:全军医学计量专项课题资助(2011-JL2-005)
通讯作者: 王雅棣,Emailwangyadi@hotmail.com   
引用本文:   
张富利,王雅棣,刘清智等. 应用Octavius体模配合PTW Seven29二维矩阵进行HT计划剂量验证[J]. 中华放射肿瘤学杂志, 2014, 23(5): 422-425.
Zhang Fuli,Wang Yadi,Liu Qingzhi et al. Evaluation of PTW Seven29 combining Octavius phantom for tomotherapy patient-specific quality assurance[J]. Chinese Journal of Radiation Oncology, 2014, 23(5): 422-425.
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