摘要
背景:信号处理是普通导管心内膜三维标测中一项关键技术,需根据其特征设计处理流程,传统处理方法无法消除信号中的大量噪声。目的:进行心内膜三维标测原理的体外模拟实验及信号处理。方法:设计专用压控恒流源做电场激励源以降低噪声,并利用MATLAB信号处理功能对数据进行处理,分别采用带通滤波、包络提取、小波降噪、求均值等方法计算出标测距离,并与实际距离进行对比。结果与结论:该方法有效地降低噪声、直流分量等干扰因素,得到了正确的标测向量,解决了普通导管心内膜三维标测中的信号处理问题,并减小了由呼吸及心跳所引起的定位误差,由此计算所得标测向量误差ε<7%。提示此方法可应用于普通导管心内膜三维标测系统的信号处理。
BACKGROUND：Signal processing is one of the key technologies in endocardial mapping by using ordinary catheter,it must be designed base on its characteristics,but,excessive noise can not be eliminated through traditional methods.OBJECTIVE：To stimulate in vitro experiment and signal processing of endocardial mapping system.METHODS：Noise was reduced partly by using a developed voltage controlled constant current source device,and then experiment data were processed with digital signal processing tool of MATLAB.The signal processing including bandpass,extract envelope,wavelet denoising and median filtering;finally,distances were calculated and compared with actual values.RESULTS AND CONCLUSION：It shows that this process effectually reduces external noise and the interference of breath and heartbeat,and the relative error of mapping vectors is less than 7%.It proved that this process can be used in endocardial mapping system.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2011年第26期4850-4853,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
