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.
目的分析射野影像系统系列成像图所显示的治疗摆位的重复性。
Objective Analysis of the results of field replacement repeatability using real time portal imaging system is done.
完成单级倒立摆系统的调试和实验，实现了倒立摆位置随动以及定位功能。
Debugging and experiment of single inverted pendulum is accomplished, function of following and positioning was realized.
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