Brainlab联合六维床在头颈部放射治疗中的可行性研究

目的 探讨利用Brainlab及六维床分析头颈部放射治疗中的摆位误差的临床可行性.方法 以该院2016年8-10月收治的24例头颈部肿瘤患者为研究对象,技术员摆位后每次Brainlab扫描,与定位CT图像配准后得到3个平移方向左右(X),头脚(Y),腹背(Z)及3个绕轴旋转方向Rx、Ry、Rz摆位误差,调整后再次Brainlab扫描,得到纠正后误差.结果 Brainlab联合六维床在线校正明显降低了摆位误差,所有方向上的摆位误差均向0位靠拢.其中Ry、Rz方向上差异无统计学意义(P＞0.05),X、Y、Z、Rx方向上差异有统计学意义(P＜0.05).结论 Brainlab联合六维床在线校正明显减小头颈部放疗的平移及旋转方向摆位误差,减少正常组织受量,提高放疗精确性.

Study on feasibility of Brainlab combined with 6-degree-of-freedom couch in radiotherapy of head and neck

Objective To study the feasibility of Brainlab plus 6-degree-of-freedom(6D) couch in the radiotherapy of head and neck by using their setup error.Methods Twenty-four patients with head and neck neoplasms in our hospital during AugustOctober 2016 were taken as the examples.After positioning by technician,each Brainlab was carried out,the setup errors in 3 translation directions of left-to-right(X),head-to-foot(Y) and abdomen to-back(Z) and 3 pivoting directions of Rx,Ry and Rz were obtained after registration of positioned CT image.After adjustment,Brainlab re-scanning was conducted for getting corrected errors.Results The online correction by Brainlab plus 6D obviously reduced the setup errors.The setup errors in all directions approached to 0,in which the difference between Ry and Rz directions had no statistical significance(P＞0.05),while the difference among the X,Y,Z and RX directions was statistically significant(P＜0.05).Conclusion The online corrections of Brainlab combined with 6D considerably reduces the errors in translation and rotation directions in radiotherapy of head and neck neoplasms,thus reduces normal tissue received amount and increases the radiotherapeutic accuracy.