医疗装备
醫療裝備
의료장비
Chinese Journal of Medical Device
2015年
15期
1-2,3
,共3页
曹泓立%唐虹%孙欣%汪志
曹泓立%唐虹%孫訢%汪誌
조홍립%당홍%손흔%왕지
头颈部肿瘤%摆位误差%电子射野影像装置%外扩边界
頭頸部腫瘤%襬位誤差%電子射野影像裝置%外擴邊界
두경부종류%파위오차%전자사야영상장치%외확변계
head and neck tumor%set-up error%electronic portal imaging device%margin
目的：应用电子射野影像装置（EPID）测定头颈部肿瘤调强放疗中的摆位误差，为治疗计划设计时CTV外扩到PTV提供参考依据。方法：对20例头颈部肿瘤患者行调强放射治疗，将每周在治疗前应用EPID拍摄的正、侧位图像与数字重建图像（DRR）根据骨性标志进行配准比对，分别记录在左右、头脚、前后方向上的移动，根据得到的位移数据计算系统误差（∑）和随机误差（δ）。结果：20例头颈部肿瘤患者共采集120组数据，统计分析在左右、头脚、前后三个方向上的系统摆位误差分别为0.18，0.22，0.18 cm，随机误差分别为0.19，0.19，0.16 cm。结论：对于头颈部肿瘤调强放疗，CTV到PTV的外扩边界至少为左右方向0.49 cm，头脚方向0.57 cm，前后方向0.47 cm。
目的：應用電子射野影像裝置（EPID）測定頭頸部腫瘤調彊放療中的襬位誤差，為治療計劃設計時CTV外擴到PTV提供參攷依據。方法：對20例頭頸部腫瘤患者行調彊放射治療，將每週在治療前應用EPID拍攝的正、側位圖像與數字重建圖像（DRR）根據骨性標誌進行配準比對，分彆記錄在左右、頭腳、前後方嚮上的移動，根據得到的位移數據計算繫統誤差（∑）和隨機誤差（δ）。結果：20例頭頸部腫瘤患者共採集120組數據，統計分析在左右、頭腳、前後三箇方嚮上的繫統襬位誤差分彆為0.18，0.22，0.18 cm，隨機誤差分彆為0.19，0.19，0.16 cm。結論：對于頭頸部腫瘤調彊放療，CTV到PTV的外擴邊界至少為左右方嚮0.49 cm，頭腳方嚮0.57 cm，前後方嚮0.47 cm。
목적：응용전자사야영상장치（EPID）측정두경부종류조강방료중적파위오차，위치료계화설계시CTV외확도PTV제공삼고의거。방법：대20례두경부종류환자행조강방사치료，장매주재치료전응용EPID박섭적정、측위도상여수자중건도상（DRR）근거골성표지진행배준비대，분별기록재좌우、두각、전후방향상적이동，근거득도적위이수거계산계통오차（∑）화수궤오차（δ）。결과：20례두경부종류환자공채집120조수거，통계분석재좌우、두각、전후삼개방향상적계통파위오차분별위0.18，0.22，0.18 cm，수궤오차분별위0.19，0.19，0.16 cm。결론：대우두경부종류조강방료，CTV도PTV적외확변계지소위좌우방향0.49 cm，두각방향0.57 cm，전후방향0.47 cm。
Objective:To evaluate the set-up errors of intensity modulated radiation therapy(IMRT)for head and neck tumors using electronic portal imaging device(EPID), and to provide reference data on the margin between the CTV and PTV .Methods:From November 2013 to March 2014, twenty patients who received head and neck tumors treated with IMRT ,were included in this study. Anterioposterior and lateral portal images were taken weekly before irradiation.The translational shifts along left-right,superior-inferior and anterior-posterior were calculated with aligning the head and neck bony structures on the electronic portal images and digitally reconstructed radiographs(DRR).The systematic and random set-up errors were Evaluated based on the 120 sets of data. The shift margin from CTV to PTV was calculated.Results:In the left-right, superior-inferior and anterior-posterior directions, the systematic set-up errors were 0.18, 0.22 and 0.18cm respectively, the random set-up errors were 0.19, 0.19 and 0.16cm respectively.Conclusions:For the patients with head and neck tumors undergoing IMRT, the margins from CTV to PTV should be 0.49cm in left-right direction, and 0.57cm in superior-inferior direction, and 0.47cm in anterior-posterior direction.
