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
5期
422-425
,共4页
张富利%王雅棣%刘清智%张伟超%王平
張富利%王雅棣%劉清智%張偉超%王平
장부리%왕아체%류청지%장위초%왕평
螺旋断层放射疗法%二维探测器阵列%剂量验证%质量保证
螺鏇斷層放射療法%二維探測器陣列%劑量驗證%質量保證
라선단층방사요법%이유탐측기진렬%제량험증%질량보증
Tomotherapy%PTW Seven29 detector array%Dose verification%Quality assurance
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.
目的 研究採用Octavius體模配閤PTW Seven29二維探測器陣列對HT繫統的調彊計劃實施劑量驗證的可行性.方法 分彆對二維矩陣行冠狀位和矢狀位測量,穫取模體中冠狀麵和矢狀麵劑量分佈.通過HT繫統MVCT成像和配準消除床麵沉降的影響,確保實現體模和探測器陣列的精確襬位.實施治療質量保證計劃照射後將二維探測器陣列測量穫得的平麵劑量分佈與HT計劃繫統模體計劃計算穫得的平麵劑量分佈進行比較.對12例噁性腫瘤患者採用γ分析法進行HT計劃劑量驗證.結果 PTW Seven29二維探測器水平、垂直放置,閾值分彆為TH5、TH10、TH20、TH30時,採用3％/2 mm、3％/3 mm、3％/4 mm、3％/5 mm標準的γ參數≤1的平均通過率均＞91.7％和93.9％.測量所得劑量分佈與計算結果在相應平麵的幾何分佈均呈現齣良好的一緻性.結論 Octavius體模配閤PTW Seven29二維探測器陣列用于HT計劃驗證能穫得令人滿意結果.
목적 연구채용Octavius체모배합PTW Seven29이유탐측기진렬대HT계통적조강계화실시제량험증적가행성.방법 분별대이유구진행관상위화시상위측량,획취모체중관상면화시상면제량분포.통과HT계통MVCT성상화배준소제상면침강적영향,학보실현체모화탐측기진렬적정학파위.실시치료질량보증계화조사후장이유탐측기진렬측량획득적평면제량분포여HT계화계통모체계화계산획득적평면제량분포진행비교.대12례악성종류환자채용γ분석법진행HT계화제량험증.결과 PTW Seven29이유탐측기수평、수직방치,역치분별위TH5、TH10、TH20、TH30시,채용3％/2 mm、3％/3 mm、3％/4 mm、3％/5 mm표준적γ삼수≤1적평균통과솔균＞91.7％화93.9％.측량소득제량분포여계산결과재상응평면적궤하분포균정현출량호적일치성.결론 Octavius체모배합PTW Seven29이유탐측기진렬용우HT계화험증능획득령인만의결과.
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.
