结论鼻咽癌imrt具有一定程度的摆位误差。
Conclusion There exists some extent of setup error in nasopharyngeal carcinoma IMRT.
结论锥束CT扫描在线校正能够缩小摆位误差。
Conclusion the cone beam ct and on-line correction could reduce the setup error.
目的探讨锥形束CT用于调强放疗分次间摆位误差测量。
Objective: This work was to analyze the set-up errors in image guided IMRT for tumors using the cone-beam computed tomography (CBCT).
结论真空体膜的应用能减少摆位误差，提高肿瘤放射治疗精度。
Conclusions The application of vacuum body film can decrease the leeway of placing and improve the accuracy of radiotherapy.
目的：分析鼻咽癌常规放射治疗摆位误差的原因，寻求解决摆位误差的方法。
Objective: To analyze the causes of posture errors in conventional radiotherapy of the nasopharyngeal carcinoma, seek methods of rectification.
因此在治疗中快速准确地做出摆位评估，及时纠正摆位误差，是保证放射治疗质量的关键。
Radiotherapy quality can be improved by rapid assessment of the position and timely correction of set-up error.
目的：测定和分析三维适形及调强放疗的摆位误差，并依此计算CTV外扩PTV边界的大小。
Objective: To examine and analyze the set-up errors for patients with three dimensional conformal and Intensity Modulated Radiotherapy to calculate CTV referential safety margins of PTV.
在EPID系统下进行实时摆位误差纠正，可进一步降低摆位系统误差和随机误差，提高摆位精度。
Online correction of setup error using EPID in order to reduce systematic error and random error and then improve setup precision.
在EPID系统下进行实时摆位误差纠正，可进一步降低摆位系统误差和随机误差，提高摆位精度。
Online correction of setup error using EPID in order to reduce systematic error and random error and then improve setup precision.
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