摘要
目的 :通过对头颈部肿瘤螺旋断层放疗摆位误差的评估,分析影响治疗精度的因素,提高放疗精确度。方法 :选取2016年2—7月的头颈部肿瘤患者35例,每次治疗前均进行兆伏级CT(MVCT)扫描,在规范摆位过程的基础上,分析MVCT图像引导下的1 092组摆位误差数据,总结减少摆位误差的方法和提高精度的流程规范。结果:X、Y、Z方向摆位误差分别为(0.98±0.91)、(1.63±1.22)、(1.11±0.87)mm,最终手动参与配准执行后分别为(0.97±0.89)、(1.58±1.08)、(1.06±0.83)mm,Y方向摆位误差最大,其次是Z方向,X方向最小。其中摆位误差大于等于3 mm的频数X、Y、Z方向分别是6、49、18,所占比例分别为0.55%、4.49%、1.65%。头颈部肿瘤放疗的摆位误差较小,通过配准可以量化地减小。结论:头颈部肿瘤放疗的摆位误差受多种因素影响,减小误差的最好办法就是制定严格的规章制度,规范质控工作,同时提高操作技师的摆位与影像分析水平。
Objective To analyze the factors for tomotherapy precision related to the setup errors in the head and neck tumors to enhance the radiotherapy precision. Methods Totally 35 head and neck tumor patients from February to July 2016 were enrolled into the study, MVCT scan was executed before each time of tomotherapy and setup flow was standardized. There were 1 092 errors sets for the setup guided by MVCT image analyzed, and the method for reducing the setup error and the standardized process for enhancing the tomotherapy precision were put forward accordingly. Results The setup errors at X, Y and Z directions were（0.98±0.91）,（1.63±1.22）,（1.11±0.87） mm originally, and became（0.97±0.89）,（1.58±1.08）,（1.06±0.83） mm after manual matching, and the setup error gained maximum value at Y direction and minimum value at X direction. The numbers of cases with the setup error not less than 3 mm were 6, 49 and 18 respectively at X, Y and Z directions, and the corresponding proportions were 0.55%, 4.49% and 1.65% respectively. The setup error for the tomotherapy in the head and neck tumors was low, and matching contributed to reducing the setup error. Conclusion There are multi factors affecting the setup error of the tomotherapy of the head and neck tumors, and the measures to decrease the setup error include strict institutions, standardized quality control and enhanced radiologist level.
出处
《医疗卫生装备》
CAS
2017年第8期79-81,共3页
Chinese Medical Equipment Journal
基金
广东省科技计划项目(2014A020212254)
