摘要
目的研究62例宫颈癌患者调强放疗（IMRT）中摆位误差。方法搜集并分析自2012年1月至2014年12月接受我院放射治疗的62例宫颈癌患者的资料。在接受放射治疗的过程中给患者在每周（1～2次）利用摄影系统（EPID）拍摄正侧位的电子射野图,并在电子摄影系统下将拍摄的电子射野图与数字重建射线影像比较,计算出X（左右）轴、Y（腹部）轴、Z（头脚）轴的摆位误差。结果总体系统误差Z轴为（0.22±1.58）mm、X轴为（-0.82±1.47）mm、Y轴为（-0.20±2.31）mm,随机误差的标注差为Z轴为0.39 mm、X轴为0.41 mm、Y轴为0.65 mm,摆位扩边值为Z轴位4.25 mm、X轴为4.04 mm、Y轴为6.23 mm。原计划的PTV的95%剂量和最小剂量较再计划的要明显的大,原计划膀胱剂量体积及直肠剂量体积较再计划的明显的小,且相比P〈0.05,具有统计学意义。结论对调强放疗中摆位误差的研究分析,促进提高摆位的准确度,进一步提高放疗的精准性。
Objective To study the set- up errorsin intensity modulated radiation therapy purpose（ IMRT） of 62 patients suffering cervical cancer. Methods The clinical datas of 62 patients suffering from cervical cancer,which received therapy in our hospital from January 2011 to December 2014,were collected and analyzed. Photographic systems（ EPID） was used to take electronic photo PA LAT for patients once or two times a week in the course of radiation therapy,and compared the electronic portal map and digitally reconstructed image and calculated thepositioning errors of X（ left and right） axis,Y（ abdomen） axis and Z（ head and feet）axis. Results The results of the overall system error were Z- axis（ 0. 22 ± 1. 58） mm,X axis（- 0. 82 ± 1. 47）mm,Y- axis（- 0. 20 ± 2. 31） mm,random labelederror were Z- axis0. 39 mm,X- axis0. 41 mm,Y- axis 0.65 mm,broadening position value of the Z- axis was4. 25 mm,X- axis4. 04 mm,Y- axis is 6. 23 mm. 95% dose and minima dose PTV value in original plan were more than that in further plan,but on the contrary,the dose for bladder and rectum were less than that in further plan. Conclusions The analysis on positioning error in swap strong radiotherapy,can improve the accuracy of positioning,further improve the accuracy of the radiotherapy process.
出处
《齐齐哈尔医学院学报》
2015年第35期5313-5314,共2页
Journal of Qiqihar Medical University
