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
48-52
,共5页
刘利彬%吴君心%瞿宜艳%蒋思思%郑步宏
劉利彬%吳君心%瞿宜豔%蔣思思%鄭步宏
류리빈%오군심%구의염%장사사%정보굉
体层摄影术,X线计算机,锥形束%真空垫%热塑成型网罩%摆位误差%外放边界%胸腹部肿瘤
體層攝影術,X線計算機,錐形束%真空墊%熱塑成型網罩%襬位誤差%外放邊界%胸腹部腫瘤
체층섭영술,X선계산궤,추형속%진공점%열소성형망조%파위오차%외방변계%흉복부종류
Tomography,X-ray computed,cone-beam%Vacuum bag%Thermoplastic mask%Setup error%Margin%Thoracic and abdominal neopalsms
目的 应用千伏级CBCT研究IMRT两种体位固定方式的摆位误差.方法 选取60例胸腹部肿瘤IMRT患者均分两组,研究组采用体部固定底板+真空垫+热塑成型网罩体位固定方式,对照组采用体部固定底板+热塑成型网罩体位固定方式.放疗前行CBCT扫描并在线匹配,得出左右、上下、前后方向摆位误差,并用2.5Σ +0.7δ算出PTV外放界值.对两组摆位误差比较行成组t检验.结果 研究组患者左右、上下、前后方向的摆位误差分别为(0.32±2.58)、(-0.40±3.89)、(-0.75 ±2.43)mm,PTV外放界值分别为5.60、6.08、6.32 mm;对照组的分别为(0.62±3.60)、(2.44±4.93)、(0.66±2.85) mm和8.07、10.63、6.90 mm;两组在上述方向的比较t=-0.78、-5.11、-4.22,P=0.440、0.000、0.000.结论 采用体部固定底板+真空垫+热塑成型网罩体位固定方式能有效固定患者,在控制误差方面明显优于体部固定底板+热塑成型网罩体位固定方式.
目的 應用韆伏級CBCT研究IMRT兩種體位固定方式的襬位誤差.方法 選取60例胸腹部腫瘤IMRT患者均分兩組,研究組採用體部固定底闆+真空墊+熱塑成型網罩體位固定方式,對照組採用體部固定底闆+熱塑成型網罩體位固定方式.放療前行CBCT掃描併在線匹配,得齣左右、上下、前後方嚮襬位誤差,併用2.5Σ +0.7δ算齣PTV外放界值.對兩組襬位誤差比較行成組t檢驗.結果 研究組患者左右、上下、前後方嚮的襬位誤差分彆為(0.32±2.58)、(-0.40±3.89)、(-0.75 ±2.43)mm,PTV外放界值分彆為5.60、6.08、6.32 mm;對照組的分彆為(0.62±3.60)、(2.44±4.93)、(0.66±2.85) mm和8.07、10.63、6.90 mm;兩組在上述方嚮的比較t=-0.78、-5.11、-4.22,P=0.440、0.000、0.000.結論 採用體部固定底闆+真空墊+熱塑成型網罩體位固定方式能有效固定患者,在控製誤差方麵明顯優于體部固定底闆+熱塑成型網罩體位固定方式.
목적 응용천복급CBCT연구IMRT량충체위고정방식적파위오차.방법 선취60례흉복부종류IMRT환자균분량조,연구조채용체부고정저판+진공점+열소성형망조체위고정방식,대조조채용체부고정저판+열소성형망조체위고정방식.방료전행CBCT소묘병재선필배,득출좌우、상하、전후방향파위오차,병용2.5Σ +0.7δ산출PTV외방계치.대량조파위오차비교행성조t검험.결과 연구조환자좌우、상하、전후방향적파위오차분별위(0.32±2.58)、(-0.40±3.89)、(-0.75 ±2.43)mm,PTV외방계치분별위5.60、6.08、6.32 mm;대조조적분별위(0.62±3.60)、(2.44±4.93)、(0.66±2.85) mm화8.07、10.63、6.90 mm;량조재상술방향적비교t=-0.78、-5.11、-4.22,P=0.440、0.000、0.000.결론 채용체부고정저판+진공점+열소성형망조체위고정방식능유효고정환자,재공제오차방면명현우우체부고정저판+열소성형망조체위고정방식.
Objective To study the set-up errors by CBCT in IMRT with two different immobilization techniques for thoracic and abdominal tumors.Methods Sixty patients with thoracic and abdominal tumor were included in this study and separated into study group and the control group.The study group were immobilized with carbon fiber holder,vacuum bag and thermoplastic mask.The control group were immobilized with carbon fiber holder and thermoplastic mask.CBCT scan and auto-match online were regularly performed before the treatment.The setup of left-right(x),superior-inferior(y),anterior-posterior (z) were received.The value of the Mptv was calculated,meanwhile.The grouped t-test of was carried out between these two methods.Results The shift errors in x-,y-,z-dimension of the study group were (0.32 ± 2.58) mm,(-0.40 ± 3.89) mm,(-0.75 ± 2.43) mm.The Mrrv were 5.60 mm,6.08 mm,6.32 mm.The translation set-up errors in x-,y-,z-dimension of the control group were(0.62 ±3.60),(2.44 ± 4.93),(0.66 ±2.85) mm,respectively.The MPrv were 8.07,10.63,6.90 mm,respectively.The t-test value were t =-0.78,-5.11,-4.22,P =0.440,0.000,0.000,respectively.Conclusions The immobilization techniques with carbon fiber holder,vacuum bag and thermoplastic mask would be better than the techniques without the vacuum bag in reducing the setup errors.
