摘要
目的探讨鼻咽癌精确放射治疗过程中的摆位误差。方法应用电子射野影像系统（EPID）拍摄的验证片与计划系统所形成的数字重建射线影像（DRR）进行比较。结果3个方向的摆位误差平均值分别为X轴（左右方向）（1．15±0．4）mm，Y轴（头脚方向）（1．35±0．6）mm和Z轴（前后方向）（0．34±0．2）mm，摆位偏差主要发生在X、Y方向。所发生的误差在允许范围内，且治疗期间的摆位误差无显著差异。结论鼻咽癌精确放疗时采用头颈肩网膜体位固定技术，可提高摆位精度，确保治疗效果。
Objective To inquire into the set-up errors in precise radiotherapy for nasopharyngeal carcinoma （NPC）. Methods Comparing the verified image which were recorded using the electronicportal imaging device （EPID） with the digitally reconstructed rediograph DRR. Results The average value of set-up errors in three directions was （ 1.15 ± 0.4 ） mm in the left-right （x） direction, （ 1.35 ± 0. 5 ） mm in the superior-inferior（y） direction and （0. 34±0. 2） mm in the anterior-posterior （z） direction. The set-up deviations occurred mainly in X and Y directions. The set-up error in precise radiotherapy for NPC is acceptable, and also the set-up error is no significant difference during the radiotherapy. Conclusion Using head, neck and shoulder netted model in precise radiotherapy for nasepharyngeal carcinoma （NPC） may improve the precision of set-up and ensure the therapeutic effect.
出处
《中国临床实用医学》
2009年第3期22-23,共2页
China Clinical Practical Medicine
关键词
鼻咽肿瘤
精确放疗
摆位误差
Nasopharyngeal neoplasms
Precise radiotherapy
Set-up error
