肿瘤研究与临床
腫瘤研究與臨床
종류연구여림상
CANCER RESEARCH AND CLINIC
2014年
1期
29-31
,共3页
张立娜%薛俊霞%朱夫海%吴伟章%王颖杰%夏廷毅
張立娜%薛俊霞%硃伕海%吳偉章%王穎傑%夏廷毅
장립나%설준하%주부해%오위장%왕영걸%하정의
骨转移%螺旋断层放疗%摆位误差
骨轉移%螺鏇斷層放療%襬位誤差
골전이%라선단층방료%파위오차
Bone metastases%Tomotherapy%Setup errors
目的 分析骨转移患者在自带兆伏级CT(MVCT)影像引导的螺旋断层放疗中的摆位误差,为骨转移患者从临床靶体积(CTV)外放到计划靶体积(PTV)的距离提供临床依据.方法 对30例骨转移患者采用螺旋断层放疗,体网固定装置,每次治疗前均行MVCT扫描,将扫描所得MVCT图像与定位图像(KVCT)行靶区位置配准,分析患者左右(X)、头脚(Y)、腹背(Z)和横断面旋转(Roll)方向的误差值,根据公式Margin=2.5∑+0.7σ计算出CTV-PTV外扩Margin值.结果 30例患者共行494次MVCT扫描,线性误差在X、Y、Z方向的误差(系统误差±随机误差)分别为(2.85±0.77)、(3.11±0.95)、(2.21±0.55)mm;在Roll方向的旋转误差为(0.55±0.24)..CTV-PTV外放边界在X、Y、Z三个方向Margin值分别为3.64、4.17、2.86 mm.结论 应用图像引导技术对骨转移的调强放疗可实时摆位纠正,减小了分次治疗的摆位误差,提高了治疗精度,对临床放疗具有指导价值.
目的 分析骨轉移患者在自帶兆伏級CT(MVCT)影像引導的螺鏇斷層放療中的襬位誤差,為骨轉移患者從臨床靶體積(CTV)外放到計劃靶體積(PTV)的距離提供臨床依據.方法 對30例骨轉移患者採用螺鏇斷層放療,體網固定裝置,每次治療前均行MVCT掃描,將掃描所得MVCT圖像與定位圖像(KVCT)行靶區位置配準,分析患者左右(X)、頭腳(Y)、腹揹(Z)和橫斷麵鏇轉(Roll)方嚮的誤差值,根據公式Margin=2.5∑+0.7σ計算齣CTV-PTV外擴Margin值.結果 30例患者共行494次MVCT掃描,線性誤差在X、Y、Z方嚮的誤差(繫統誤差±隨機誤差)分彆為(2.85±0.77)、(3.11±0.95)、(2.21±0.55)mm;在Roll方嚮的鏇轉誤差為(0.55±0.24)..CTV-PTV外放邊界在X、Y、Z三箇方嚮Margin值分彆為3.64、4.17、2.86 mm.結論 應用圖像引導技術對骨轉移的調彊放療可實時襬位糾正,減小瞭分次治療的襬位誤差,提高瞭治療精度,對臨床放療具有指導價值.
목적 분석골전이환자재자대조복급CT(MVCT)영상인도적라선단층방료중적파위오차,위골전이환자종림상파체적(CTV)외방도계화파체적(PTV)적거리제공림상의거.방법 대30례골전이환자채용라선단층방료,체망고정장치,매차치료전균행MVCT소묘,장소묘소득MVCT도상여정위도상(KVCT)행파구위치배준,분석환자좌우(X)、두각(Y)、복배(Z)화횡단면선전(Roll)방향적오차치,근거공식Margin=2.5∑+0.7σ계산출CTV-PTV외확Margin치.결과 30례환자공행494차MVCT소묘,선성오차재X、Y、Z방향적오차(계통오차±수궤오차)분별위(2.85±0.77)、(3.11±0.95)、(2.21±0.55)mm;재Roll방향적선전오차위(0.55±0.24)..CTV-PTV외방변계재X、Y、Z삼개방향Margin치분별위3.64、4.17、2.86 mm.결론 응용도상인도기술대골전이적조강방료가실시파위규정,감소료분차치료적파위오차,제고료치료정도,대림상방료구유지도개치.
Objective To analyze the setup errors of bone metastases patients by tomotherapy with megavoltage CT (MVCT) and calculate the CTV-PTV margins.Methods 30 patients with bone metastases were enrolled.All patients received tomotherapy,fixed with body net and received MVCT scanning before radiation.The MVCT images were registered with the kilovoltage CT (kVCT) images,the setup errors of X (lateral),Y (vertical),Z (longitudina) and Roll (transverse profile rotation) were obtained according to the formula M =2.5Σ+0.7σ calculated CTV-PTV margin.Results 30 patients were received 494 MVCT images.The errors of systemic±random were (2.85±0.77) mm,(3.11±0.95) mm,(2.21±0.55) mm,and (0,55±0.24)° on X,Y,Z and Roll directions,respectively.The CTV-PTV margins were 3.64 mm,4.17 mm,and 2.86 mm on X,Y,Z directions,respectively.Conclusion The application of image-guided technology for bone metastases can correct positioning in time,which greatly reduces setup errors of the fractionated treatment,further improves the treat accuracy and has a positive value in guiding clinical radiotherapy.
