光学表面成像系统实时运动监测精度研究

Real-time motion tracking accuracy of optical surface imaging system

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。

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