CAJ | 학술논문

目的讨论盆腔肿瘤在IGRT放疗中对位置精度的影响，分析摆位误差，为CTV外扩PTV提供参考。方法采用瓦里安23IX系统治疗盆腔患者60例，每位患者第一周连续3次，以后每周一次摆位后及误差纠正后进行CBCT扫描，将CBCT图像与原CT图像配准，分析X(左右)，Y(头脚)，Z(前后)轴和旋转E(冠状位)，F(矢状位)，G(横断位)方向的误差。结果60例患者共530次CBCT扫描，系统+随机误差在X, Y, Z, E, F, G方向为：(-0.52±4.18) mm、(0.73±4.86) mm、(-0.36±3.62) mm、(0.14±1.20)°、(0.13±1.34)°、(0.21±1.73)°，纠正后，X, Y, Z方向的误差均显著低于校正前，CTV外放边界减小。结论采用IGRT对盆腔肿瘤放疗进行位置纠正，减少摆位误差，缩小CTV外扩，提高放疗精度。
목적토론분강종류재IGRT방료중대위치정도적영향，분석파위오차，위CTV외확PTV제공삼고。방법채용와리안23IX계통치료분강환자60례，매위환자제일주련속3차，이후매주일차파위후급오차규정후진행CBCT소묘，장CBCT도상여원CT도상배준，분석X(좌우)，Y(두각)，Z(전후)축화선전E(관상위)，F(시상위)，G(횡단위)방향적오차。결과60례환자공530차CBCT소묘，계통+수궤오차재X, Y, Z, E, F, G방향위：(-0.52±4.18) mm、(0.73±4.86) mm、(-0.36±3.62) mm、(0.14±1.20)°、(0.13±1.34)°、(0.21±1.73)°，규정후，X, Y, Z방향적오차균현저저우교정전，CTV외방변계감소。결론채용IGRT대분강종류방료진행위치규정，감소파위오차，축소CTV외확，제고방료정도。
Objective To discuss the influence of setup errors on the accuracy of pelvic cancer in IGRT, analysis setup errors and determine the CTV-to-PTV margins. Methods 60 pelvic cancer patients treated with Varian 23IX, al of them were performed by CBCT before and after-correction three times in the first week and after that once a week. Then, to measure the setup errors at X(left-right), Y(superior-inferior), Z(anterior-posterior) axis and E(coronal), F(sagittal), G(axial) rotation directions. Results 530 scans obtained in al , the setup errors in X, Y, Z, E, F, G were (-0.52±4.18) mm, (0.73±4.86) mm, (-0.36±3.62)mm, (0.14±1.20)o, (0.13±1.34)o, (0.21±1.73)o respectively and were much lower after correction at X, Y, Z axis, besides, CTV-to-PTV margins decrease a lot. Conclusion The accuracy of radiotherapy can be highly increased with the use of IGRT in pelvic cancer.