中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2010年
4期
328-330
,共3页
吴君心%谢志原%林育毅%瞿宜艳%邵凌东%孔祥泉%郭爱华%潘建基
吳君心%謝誌原%林育毅%瞿宜豔%邵凌東%孔祥泉%郭愛華%潘建基
오군심%사지원%림육의%구의염%소릉동%공상천%곽애화%반건기
盆腔肿瘤%体层摄影术,χ线计算机,锥形束%摆位误差%摆位扩边
盆腔腫瘤%體層攝影術,χ線計算機,錐形束%襬位誤差%襬位擴邊
분강종류%체층섭영술,χ선계산궤,추형속%파위오차%파위확변
Pelvic neoplasm%Tomography,X-ray computed,cone-beam%Set-up errors%Setup margin
目的 利用锥形束CT(CBCT)在线研究盆腔肿瘤摆位误差的大小,推算CTV与PTV 之间外放的间隙.方法 应用医科达Synergy IGRT加速器治疗12例盆腔肿瘤患者,通过CBCT影像技术获得患者左右(x)、头脚(y)、前后(z)方向线性摆位误差以及分别以x、y、z轴旋转形成相应的u、v、w旋转摆位误差,分析其摆位误差.结果 12例患者共行229次CBCT,x、y、z、u、v、w轴自由度的系统误差±随机误差分别为(0.49±1.18)mm、(-0.11±3.45)mm、(-2.00±1.59)mm、1.14°±0.67°、0.42°±0.94°、-0.32°±0.68°.其中y方向摆位误差最大、z方向次之、x方向摆位误差最小.x、y、z方向的摆位扩边值分别为4.6、12.5、6.2 mm.结论 盆腔肿瘤放疗时不可避免存在一定程度摆位误差,为减少摆位误差影响CTV外放PTV时考虑x方向5 mm、y方向15 mm,z方向10 mm.
目的 利用錐形束CT(CBCT)在線研究盆腔腫瘤襬位誤差的大小,推算CTV與PTV 之間外放的間隙.方法 應用醫科達Synergy IGRT加速器治療12例盆腔腫瘤患者,通過CBCT影像技術穫得患者左右(x)、頭腳(y)、前後(z)方嚮線性襬位誤差以及分彆以x、y、z軸鏇轉形成相應的u、v、w鏇轉襬位誤差,分析其襬位誤差.結果 12例患者共行229次CBCT,x、y、z、u、v、w軸自由度的繫統誤差±隨機誤差分彆為(0.49±1.18)mm、(-0.11±3.45)mm、(-2.00±1.59)mm、1.14°±0.67°、0.42°±0.94°、-0.32°±0.68°.其中y方嚮襬位誤差最大、z方嚮次之、x方嚮襬位誤差最小.x、y、z方嚮的襬位擴邊值分彆為4.6、12.5、6.2 mm.結論 盆腔腫瘤放療時不可避免存在一定程度襬位誤差,為減少襬位誤差影響CTV外放PTV時攷慮x方嚮5 mm、y方嚮15 mm,z方嚮10 mm.
목적 이용추형속CT(CBCT)재선연구분강종류파위오차적대소,추산CTV여PTV 지간외방적간극.방법 응용의과체Synergy IGRT가속기치료12례분강종류환자,통과CBCT영상기술획득환자좌우(x)、두각(y)、전후(z)방향선성파위오차이급분별이x、y、z축선전형성상응적u、v、w선전파위오차,분석기파위오차.결과 12례환자공행229차CBCT,x、y、z、u、v、w축자유도적계통오차±수궤오차분별위(0.49±1.18)mm、(-0.11±3.45)mm、(-2.00±1.59)mm、1.14°±0.67°、0.42°±0.94°、-0.32°±0.68°.기중y방향파위오차최대、z방향차지、x방향파위오차최소.x、y、z방향적파위확변치분별위4.6、12.5、6.2 mm.결론 분강종류방료시불가피면존재일정정도파위오차,위감소파위오차영향CTV외방PTV시고필x방향5 mm、y방향15 mm,z방향10 mm.
Objective To analyze setup errors for irradiation of pelvic carcinoma by online conebeam CT (CBCT) scanning and to calculate the external margins from clinical target volume (CTV) to planning target volume (PTV) in treatment planning. Methods Twelve patients with rectal or prostate cancer were enrolled in this study. Translational errors (x,y,z) and rotational errors (u,v,w) were obtained by using CBCT in radiotherapy. Results The set-up errors were gathered from 229 sets of CBCT in 12patients. The systemic ± random errors on x,y,z, u,v and w axes were (0.49 ± 1.18) mm, (-0. 11 ±3.45) mm, (-2. 00 ± 1.59) mm, 1.14°±0. 67°, 0. 42°±O. 94°and -0. 32°±±0. 68°, respectively. Setup errors in the left-right, anterior-posterior, and superior-inferior directions were 4. 6 mm, 12. 5 mm, and 6. 2 mm, respectively. Conclusions Set-up errors were unavoidable in pelvic carcinoma irradiation. To minimize the influence of set-up errors, we suggest a PTV margin of 5 mm, 15 mm and 10 mm in the leftright, anterior-posterior and superior-inferior directions, respectively.