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
1期
53-55
,共3页
曹晓辉%刘明%翟福山%王安峰%杨永锋%刘兵%包超恩%白研
曹曉輝%劉明%翟福山%王安峰%楊永鋒%劉兵%包超恩%白研
조효휘%류명%적복산%왕안봉%양영봉%류병%포초은%백연
胸部肿瘤%影像引导放射疗法%体层摄影术,X线计算机,锥形束%摆位误差%外放边界
胸部腫瘤%影像引導放射療法%體層攝影術,X線計算機,錐形束%襬位誤差%外放邊界
흉부종류%영상인도방사요법%체층섭영술,X선계산궤,추형속%파위오차%외방변계
Thoracic neopalsms%Image guidance radiotherapy%Tomography,X-ray computed,cone-beam%Setup error%Margin
目的 研究千伏级CBCT引导下胸部肿瘤放疗中摆位误差及其外放边界.方法 采用瓦里安IX直线加速器机载影像系统对34例胸部肿瘤患者三维放疗前行CBCT,系统自动重建图像并与治疗计划CT图像相匹配,获得患者左右、上下、前后方向摆位误差,计算PTV及OAR外放边界.结果 共行279次扫描,考虑误差方向时左右、上下、前后方向误差分别为(-0.16 ±3.25)、(-1.36±5.43)、(-2.43 ±2.14)mm,只考虑误差大小时左右、上下、前后方向误差分别为(2.41±2.18)、(4.27±3.60)、(2.71±1.77)mm.PTV在左右、上下、前后方向外放边界分别为2.68、7.19、7.57mm.结论 本院胸部肿瘤患者应用热塑体膜固定,存在一定程度摆位误差.靶区在左右、上下、前后方向外放边界分别为2.68、7.19、7.57 mm.
目的 研究韆伏級CBCT引導下胸部腫瘤放療中襬位誤差及其外放邊界.方法 採用瓦裏安IX直線加速器機載影像繫統對34例胸部腫瘤患者三維放療前行CBCT,繫統自動重建圖像併與治療計劃CT圖像相匹配,穫得患者左右、上下、前後方嚮襬位誤差,計算PTV及OAR外放邊界.結果 共行279次掃描,攷慮誤差方嚮時左右、上下、前後方嚮誤差分彆為(-0.16 ±3.25)、(-1.36±5.43)、(-2.43 ±2.14)mm,隻攷慮誤差大小時左右、上下、前後方嚮誤差分彆為(2.41±2.18)、(4.27±3.60)、(2.71±1.77)mm.PTV在左右、上下、前後方嚮外放邊界分彆為2.68、7.19、7.57mm.結論 本院胸部腫瘤患者應用熱塑體膜固定,存在一定程度襬位誤差.靶區在左右、上下、前後方嚮外放邊界分彆為2.68、7.19、7.57 mm.
목적 연구천복급CBCT인도하흉부종류방료중파위오차급기외방변계.방법 채용와리안IX직선가속기궤재영상계통대34례흉부종류환자삼유방료전행CBCT,계통자동중건도상병여치료계화CT도상상필배,획득환자좌우、상하、전후방향파위오차,계산PTV급OAR외방변계.결과 공행279차소묘,고필오차방향시좌우、상하、전후방향오차분별위(-0.16 ±3.25)、(-1.36±5.43)、(-2.43 ±2.14)mm,지고필오차대소시좌우、상하、전후방향오차분별위(2.41±2.18)、(4.27±3.60)、(2.71±1.77)mm.PTV재좌우、상하、전후방향외방변계분별위2.68、7.19、7.57mm.결론 본원흉부종류환자응용열소체막고정,존재일정정도파위오차.파구재좌우、상하、전후방향외방변계분별위2.68、7.19、7.57 mm.
Objective To study the role of KV CBCT on the geometrical accuracy of threedimensional conformal radiotherapy (3DCRT) and to evaluate the margin of targets and peripheral OAR for thoracic carcinoma.Methods 34 patients with thoracic carcinoma were enrolled.Varian-IX liuac with OBI system was used to acquire CBCT scans before delivery in 3DCRT.The left-right (x),superior-inferior (y),anterior-posterior (z) setup errors of patients can be obtained from the tomography images automatically restructured by the system.Results According to 279 CBCT scans the systemic ± random error on x,y,z directions were (-0.16 ± 3.25) mm,(-1.36 ± 5.43) mm,(-2.43 ± 2.14) mm and (2.41 ± 2.18) mm,(4.27 ± 3.60) mm,(2.71 ± 1.77) mm respectively if we do not consider the direction of setup errors.The margins of targets were calculated as 2.68 mm,7.19 mm and 7.57 mm respectively.Conclusions Setup errors are unavoidable in thoracic carcinoma irradiation.We suggest a PTV margin of 2.68 mm,7.19 mm and 7.57 mm in the left-right,superior-inferior and anterior-posterior directions respectively in our department.
