摘要
[目的]应用常规模拟机测量和离线修正体部肿瘤患者的首次摆位误差。[方法]应用瓦里安模拟治疗机对138例体部肿瘤患者在治疗前拍摄正侧位影像,通过与治疗计划的DRR图像匹配,测出体部肿瘤患者首次的摆位误差并进行修正。[结果]138例患者首次摆位有81次误差大于3mm,需要移动治疗床调整。胸、腹部肿瘤校正比例分别为45/71和36/67。胸部肿瘤摆位误差X轴(-0.09±2.98)mm、Y轴(-0.38±4.63)mm、Z轴(0.95±3.97)mm,腹部肿瘤摆位误差X轴(0.40±1.90)mm、Y轴(-0.70±3.20)mm、Z轴(-0.80±2.20)mm。校正后摆位误差缩小。各方向误差值中,Y轴误差值最大。[结论]利用常规模拟机测量并修正首次摆位误差是一种简便有效的验证方法。
[ Purpose ] To measure and modify the first time off-line set-up errors in body tumors with simulator. [ Methods ] One hundred and thirty-eight patients with body tumors were treated by Varian Acuity simulator. All patients were immobilized with fixation devices. DRR of each patient compared with portal images from simulator and set-up errors were recorded and ana- lyzed. [Results] One hundred and thirty-eight cases of first set up had 81 times error greater than 3mm,which need to move and adjust the treatment bed. The correction ratio of chest tu- mor and abdominal tumor were 45/71 and 36/67 respectively. The systemic＋random errors in chest tumor on X,Y,Z axes were （-0.09±2.98）mm, （-0.38±4.63）mm and （0.95±3.97）mm,respec- tively,and in abdominal tumor on X,Y,Z axes were （0.40±1.90）mm, （-0.70±3.20）mm,（-0.80± 2.20）mm respectively. Set-up errors reduced after modification. Error of Y axis was the largest one. [ Conclusions ] The simulator for position calibration can measure and modify the first time set-up error. It is effective and convenient location verification.
出处
《肿瘤学杂志》
CAS
2014年第4期323-325,共3页
Journal of Chinese Oncology
