实用医技杂志
實用醫技雜誌
실용의기잡지
JOURNAL OF PRACTICAL MEDICAL TECHNIQUES
2015年
4期
357-359
,共3页
郭纪慈%黄大钡%余建荣%李珍
郭紀慈%黃大鋇%餘建榮%李珍
곽기자%황대패%여건영%리진
盆腔肿瘤%调强放射治疗%螺旋锥束计算机体层摄影术%图像引导%放射治疗精度
盆腔腫瘤%調彊放射治療%螺鏇錐束計算機體層攝影術%圖像引導%放射治療精度
분강종류%조강방사치료%라선추속계산궤체층섭영술%도상인도%방사치료정도
Pelvic neoplasms%Intensity modulated radiation therapy%Spiral cone-beam computed tomography%Image guidance%Radiotherapy accuracy
目的:应用锥形束CT(CBCT)比较不同图像引导方法对盆腔部肿瘤调强放射治疗精度的影响。方法应用瓦利安Trilogy直线加速器治疗盆腔部肿瘤30例,分为A、B、C 3组,分别采用不同CBCT图像引导方法进行比较,其中A组每天摆位后行CBCT扫描,B组隔天摆位后行CBCT扫描,C组每隔5 d摆位后行CBCT扫描,将获取的CBCT图像与CT模拟图像及其靶中心匹配,获取3组病例x轴(左右)、y轴(头脚)、z轴(腹背)3个方向的摆位误差修正值并估算其相应的摆位外扩边界(MPTV)。结果每天方案在x轴、y轴、z轴的摆位误差修正值分别为:(1.21±0.14) mm、(-2.04±7.94) mm、(-1.62±3.15) mm, MPTV分别为:3.12 mm、10.66 mm、6.26 mm。隔天方案在x轴、y轴、z轴的摆位误差修正值分别为:(1.31±4.02) mm、(2.28±13.17) mm、(1.72±8.33) mm, MPTV分别为:6.09 mm、14.92 mm、10.13 mm。每隔5 d方案在x轴、y轴、z轴的摆位误差修正值分别为:(2.13±4.26) mm、(2.48±16.6) mm、(2.65±8.09) mm,MPTV分别为:8.31 mm、17.82 mm、12.29 mm。结论增加CBCT图像引导次数可以明显提高盆腔部肿瘤调强放射治疗的精度。
目的:應用錐形束CT(CBCT)比較不同圖像引導方法對盆腔部腫瘤調彊放射治療精度的影響。方法應用瓦利安Trilogy直線加速器治療盆腔部腫瘤30例,分為A、B、C 3組,分彆採用不同CBCT圖像引導方法進行比較,其中A組每天襬位後行CBCT掃描,B組隔天襬位後行CBCT掃描,C組每隔5 d襬位後行CBCT掃描,將穫取的CBCT圖像與CT模擬圖像及其靶中心匹配,穫取3組病例x軸(左右)、y軸(頭腳)、z軸(腹揹)3箇方嚮的襬位誤差脩正值併估算其相應的襬位外擴邊界(MPTV)。結果每天方案在x軸、y軸、z軸的襬位誤差脩正值分彆為:(1.21±0.14) mm、(-2.04±7.94) mm、(-1.62±3.15) mm, MPTV分彆為:3.12 mm、10.66 mm、6.26 mm。隔天方案在x軸、y軸、z軸的襬位誤差脩正值分彆為:(1.31±4.02) mm、(2.28±13.17) mm、(1.72±8.33) mm, MPTV分彆為:6.09 mm、14.92 mm、10.13 mm。每隔5 d方案在x軸、y軸、z軸的襬位誤差脩正值分彆為:(2.13±4.26) mm、(2.48±16.6) mm、(2.65±8.09) mm,MPTV分彆為:8.31 mm、17.82 mm、12.29 mm。結論增加CBCT圖像引導次數可以明顯提高盆腔部腫瘤調彊放射治療的精度。
목적:응용추형속CT(CBCT)비교불동도상인도방법대분강부종류조강방사치료정도적영향。방법응용와리안Trilogy직선가속기치료분강부종류30례,분위A、B、C 3조,분별채용불동CBCT도상인도방법진행비교,기중A조매천파위후행CBCT소묘,B조격천파위후행CBCT소묘,C조매격5 d파위후행CBCT소묘,장획취적CBCT도상여CT모의도상급기파중심필배,획취3조병례x축(좌우)、y축(두각)、z축(복배)3개방향적파위오차수정치병고산기상응적파위외확변계(MPTV)。결과매천방안재x축、y축、z축적파위오차수정치분별위:(1.21±0.14) mm、(-2.04±7.94) mm、(-1.62±3.15) mm, MPTV분별위:3.12 mm、10.66 mm、6.26 mm。격천방안재x축、y축、z축적파위오차수정치분별위:(1.31±4.02) mm、(2.28±13.17) mm、(1.72±8.33) mm, MPTV분별위:6.09 mm、14.92 mm、10.13 mm。매격5 d방안재x축、y축、z축적파위오차수정치분별위:(2.13±4.26) mm、(2.48±16.6) mm、(2.65±8.09) mm,MPTV분별위:8.31 mm、17.82 mm、12.29 mm。결론증가CBCT도상인도차수가이명현제고분강부종류조강방사치료적정도。
Objective To compare the effects of different image guidance methods by Cone-beam CT(CBCT) on precision of pelvic tumors intensity modulated radiation therapy (IMRT). Methods Thirty patients with pelvic tumors had been divided into A, B, C groups received radiotherapy by Varian Trilogy linear accelerator. These three groups used different image guidance methods by CBCT, then, A group scan CBCT images after daily reposition, B group scan CBCT images every other day, and C group scan CBCT images every five days. CBCT images of each patient were dimensionally matched with planned CT images in planning system, then analyzed setup error revisions and the corresponding external boundary of target area(MPTV) in x(left-right), y(ventral-dorsal), z(cranial-caudal) directions. Results The average setup error revisions of A group patients were(1.21±0.14) mm,(-2.04±7.94) mm,(-1.62±3.15) mm respectively, and the MPTV values were 3.12 mm, 10.66 mm, 6.26 mm respectively. In comparison, the average setup error revisions of B group patients were(1.31±4.02) mm,(2.28±13.17) mm,(1.72±8.33) mm, and the MPTV values were 6.09 mm, 14.92 mm, 10.13 mm. Meanwhile, the average setup error revisions of C group patients were (2.13±4.26) mm, (2.48±16.6) mm, (2.65±8.09) mm, and the MPTV values were 8.31 mm, 17.82 mm, 12.29 mm. Conclusion High image guidance frequency by CBCT can result in significantly improving the accuracy of pelvic tumor radiotherapy.