光学表面成像系统实时运动监测精度研究

目的:探究光学表面成像系统实时运动监测的精度。方法:将30例患者的呼吸曲线输入到模体中模拟呼吸运动，同时利用Catalyst系统对模体进行实时运动监测，比较系统监测的呼吸曲线与参考曲线，从而得到光学表面成像系统实时运动监测的精度。结果:光学表面成像系统监测的呼吸曲线与参考曲线具有较高的一致性，相关系数均大于0.99，显著相关。监测误差的平均值为（0.24±0.04）mm，并且随着呼吸信号频率的增加而减小。结论:光学表面成像系统的实时运动监测精度较高，可用于对患者呼吸运动的监测。在进行呼吸门控治疗时，应考虑呼吸监测系统引入的误差。

Real-time motion tracking accuracy of optical surface imaging system

Objective To explore the accuracy of real-time motion tracking using optical surface imaging system. MethodsThe respiratory curves of 30 patients were input into a phantom for simulating respiratory motion, and Catalyst system wasused for tracking the real-time motion of the phantom. The respiratory curves recorded by the system were compared with thereference curves, thereby obtaining the real-time motion tracking accuracy of optical surface imaging system. Results Therespiratory curves recorded by the system had a high consistency with the reference curves, and the correlation coefficientwas higher than 0.99, indicating significant correlation. The average of tracking errors was (0.24±0.04) mm, and the error wasdecreased while the respiratory signal frequency was increased. Conclusion The optical surface imaging system which has arelatively high real-time respiratory motion tracking accuracy can be used for respiratory motion tracking. During respiratorygating treatment, the error introduced by the respiratory motion tracking system should be considered.