中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2014年
4期
357-360
,共4页
柳先锋%靳富%钟明松%何亚男%邱大%何光雷%王颖
柳先鋒%靳富%鐘明鬆%何亞男%邱大%何光雷%王穎
류선봉%근부%종명송%하아남%구대%하광뢰%왕영
容积调强弧形治疗%剂量验证%γ通过率%剂量偏差%吻合距离
容積調彊弧形治療%劑量驗證%γ通過率%劑量偏差%吻閤距離
용적조강호형치료%제량험증%γ통과솔%제량편차%문합거리
Volumetric modulated arc therapy%Dose verification%γ passing rate%Dose difference%Distance to agreement
目的 研究瑞典ScandiDos公司的Deha4模体在VMAT计划验证时摆位不确定性偏转对γ通过率的影响.方法 从接受VMAT患者中随机抽取2个头颈部、2个肺部和1个盆腔部位共5个病例.在Eclipse8.6 TPS中分别对5个病例的放疗计划制作验证计划,采用Delta4在瓦里安Clinac Ⅸ直线加速器下做剂量验证测量.在Delta4模体精确摆位后,分别将模体以直线加速器等中心为中心在水平方向偏转一定角度,完成11次剂量验证测量.分析Delta4模体发生偏转后对γ通过率的影响.结果 Delta4模体依次偏转0.0°、0.2°、0.4°、0.6°、0.8°、1.0°、1.2°、1.4°、1.6°、1.8°、2.0°时测量所得γ通过率略有下降,但均＞90％(剂量偏差为3％,吻合距离为3 mm).结论 Delta4在VMAT计划验证中,在模体摆位不确定性偏转≤2°范围内,其γ通过率对模体摆位的不确定性偏转无依赖性,而在模体不确定性偏转后剂量偏差、吻合距离的通过率均发生明显变化.
目的 研究瑞典ScandiDos公司的Deha4模體在VMAT計劃驗證時襬位不確定性偏轉對γ通過率的影響.方法 從接受VMAT患者中隨機抽取2箇頭頸部、2箇肺部和1箇盆腔部位共5箇病例.在Eclipse8.6 TPS中分彆對5箇病例的放療計劃製作驗證計劃,採用Delta4在瓦裏安Clinac Ⅸ直線加速器下做劑量驗證測量.在Delta4模體精確襬位後,分彆將模體以直線加速器等中心為中心在水平方嚮偏轉一定角度,完成11次劑量驗證測量.分析Delta4模體髮生偏轉後對γ通過率的影響.結果 Delta4模體依次偏轉0.0°、0.2°、0.4°、0.6°、0.8°、1.0°、1.2°、1.4°、1.6°、1.8°、2.0°時測量所得γ通過率略有下降,但均＞90％(劑量偏差為3％,吻閤距離為3 mm).結論 Delta4在VMAT計劃驗證中,在模體襬位不確定性偏轉≤2°範圍內,其γ通過率對模體襬位的不確定性偏轉無依賴性,而在模體不確定性偏轉後劑量偏差、吻閤距離的通過率均髮生明顯變化.
목적 연구서전ScandiDos공사적Deha4모체재VMAT계화험증시파위불학정성편전대γ통과솔적영향.방법 종접수VMAT환자중수궤추취2개두경부、2개폐부화1개분강부위공5개병례.재Eclipse8.6 TPS중분별대5개병례적방료계화제작험증계화,채용Delta4재와리안Clinac Ⅸ직선가속기하주제량험증측량.재Delta4모체정학파위후,분별장모체이직선가속기등중심위중심재수평방향편전일정각도,완성11차제량험증측량.분석Delta4모체발생편전후대γ통과솔적영향.결과 Delta4모체의차편전0.0°、0.2°、0.4°、0.6°、0.8°、1.0°、1.2°、1.4°、1.6°、1.8°、2.0°시측량소득γ통과솔략유하강,단균＞90％(제량편차위3％,문합거리위3 mm).결론 Delta4재VMAT계화험증중,재모체파위불학정성편전≤2°범위내,기γ통과솔대모체파위적불학정성편전무의뢰성,이재모체불학정성편전후제량편차、문합거리적통과솔균발생명현변화.
Objective To study the effect of the uncertain deflection of the Delta4 phantom (ScandiDos AB,Sweden) in setting up on the Gamma index passing rate during the VMAT plan verification.Methods Two patients with head and neck cancer,two with lung cancers and one with pelvic cancer receiving VMAT radiotherapy were randomly chosen.By means of Eclipse8.6 TPS the treatment plans elaborated for the five patients were picked up to make the verification plans and Delta4 was used to perform dose verification On VARIAN Clinac Ⅸ.The Delta4 phantom was precisely set up first,and then it was deflected in a given angle towards the horizontal direction in relation to the center of the linear accelerator isocenter to perform the dose verification for 11 times successively.To figure out the relationship between the deflection angle of the Delta4 phantom and the Gamma index passing rate.Results As the Delta4 phantom was deflected by 0.0°,0.2°,0.4°,0.6°,0.8°,1.0°,1.2°,1.4°,1.6°,1.8° and 2.0° in sequence,the measured Gamma index passing rates presented a slight decline,but all greater than 90％ (DD 3％,DTA 3 mm).Conclusions In the VMAT plan verification,the Gamma index passing rate of Delta4 has no dependence on the uncertain deflection of the Delta4 phantom provided that the uncertain deflection of the Delta4 phantom is no greater than 2°,but the passing rates of DD and DTA vary significantly with the uncertain deflection of the Delta4 phantom.
