【摘 要】
：
Time consuming of dynamic multileaf collimator(dMLC)quality assurance(QA)is an issue for clinical radiotherapy department.Considering the time consuming procedures in dynamic MLC QA,dedicated EPID bas
【机 构】
：
Department of Radiation Oncology College of Medicine,Yonsei University,Seoul,120-752,Korea
【出 处】
：
The 15th Asia-Oceania Congress of Medical Physics (AOCMP2015
论文部分内容阅读
Time consuming of dynamic multileaf collimator(dMLC)quality assurance(QA)is an issue for clinical radiotherapy department.Considering the time consuming procedures in dynamic MLC QA,dedicated EPID based dynamic MLC QA program was widely used.It is kwon that Electronic portal imaging devices(EPID)for dMLC QA advantage is simple and quick set up,no need of separate system,high resolution,immediate analysis.Commercialized EPID based dMLC QA tool needs a validation of clinical site reference parameter.The purpose of this study is to validation of the EPID based QA tools for each dMLC QA category with the reference parameters and tolerance levels.We commissioned ARTSCAN TM(AQULLAB,Lille,France)for four Elekta Agility linear accelerator(Elekta AB,Stockholm,Sweden)MLCs and validated six category including calibration of image,dMLC dosimetry,static picket fence,VMAT picket fence,doe rate/gantry speed and MLC speed for dynamic MLC QA.We acquired 20 EPID images using vender provided dynamic delivery MLC file and validated it as an analysis protocol.We performed dMLC QA using same dynamic delivery MLC file for 6 month in the 4 Agility linac MLCs.The reference parameter was defined using 6 month average value and the tolerance level was defined using standard deviation value.We could see the meaning of the each category parameters and figure out each machines changing trend using ARTISCAN report tools after validation of each parameters.The EPID based dMLC QA tool not reduce the time consuming process,but also guaranties the dosimetric accuracy of dIMRT and VMAT by verification of MLC/gantry position and speed.
其他文献
目的:探讨肢体骨肉瘤新辅助化疗的疗效评估系统的近期临床效果.方法:回顾性分析我科2013年1月至2013年12月收治并进行新辅助化疗疗效评估的且随访资料完整的36肢体骨肉瘤患者资料.对确诊为骨肉瘤的患者先进行新辅助化疗,化疗后利用我科自行设计的新辅助化疗评估系统进行打分,根据打分结果判断新辅助化疗的效果.化疗后进行手术,采取肿瘤标本进行病理分析并计算肿瘤坏死率.
BIRC5/survivin genetic 3-untranslated regions(3UTR)microRNA(miRNA)binding sites variants are significantly associated with cancer risk,but,the roles of genetic variants in BIRC5/survivin gene 3UTR and
Objective.The aim of this study was to evaluate the relationship between glutathione S-transferase p1(GSTP1)polymorphisms and prognosis of osteosarcoma patients treated with chemotherapy by performing
目的 分析膝关节周围骨巨细胞瘤(giant cell tumor,GCT)病理性骨折的临床和影像学特征。方法 回顾2000年3月至2015年4月之间中国骨巨细胞瘤协作组(giant cell tumor team of China,GTOC)包括天津医院、济南军区总医院、西京医院、浙医二院、南京军区总医院、内蒙二院和河北省三院7家骨肿瘤治疗中心收集的153例胫骨近端和股骨远端伴病理性骨折的原发GC
目的 骨巨细胞瘤(giant cell tumors of bone,GCT)是我国最常见的原发性骨肿瘤之一。但尚缺乏来自国家代表性样本的报道。本研究目的是应用多中心国家代表性GCT数据库,探讨中国人骨巨细胞瘤的分布特征,为进一步开展GCT的临床和基础研究奠定基础。方法 所有病例选自2002年～2014年期间在11家三甲医院(中国骨巨细胞瘤协作组)就医的骨巨细胞瘤患者。选择有明确诊断的各部位GCT
Methods:The records cervical cancer patients with squamous cell carcinoma(stage IB to IVA)underwent definitive radiotherapy in year 2009-2013 were retrospective studied.The patients received the total
Objectives:Postoperative cervical cancer patients with large volume of target area and the shape of thetarget is concave treated with IMRT technology is time consuming,VMAT technology can reducetreatm
Purpose:To quantify the impact of off-center position on image quality of megavoltage CT in headand neck tumor patient and body tumor patient.
Purpose:Parotid gland tumors account for 3%of head and neck tumors.Adjuvant radiotherapy is suggested for reducing the risk of high grade parotid tumors.The aim of the present study was to compare pat
Purpose:Respiratory gated radiation therapy(RGRT)gives accurate results when a patients breathing is stable and regular.Thus,the patient should be fully aware during respiratory pattern training befor