Continuous non-invasive blood pressure (BP) measurement can be realized by using pulse transit time (PTT) based on electrocardiogram (ECG) and pulse wave signal. Modulated magnetic signature of blood (MMSB) is a promi...Continuous non-invasive blood pressure (BP) measurement can be realized by using pulse transit time (PTT) based on electrocardiogram (ECG) and pulse wave signal. Modulated magnetic signature of blood (MMSB) is a promising approach to obtain PTT. The origin of MMSB is critical to establish the relationship between MMSB and BP. In this paper, two possible origins of MMSB, blood disturbance mechanism and angular variation mechanism, are analyzed and verified through three control experi-ments under different conditions. The influence of blood velocity alteration and blood volume alteration on magnetic field is investigated though blood flow simulation sys-tem. It is found that MMSB comes mainly from the periodic blood flow while the per-turbation caused by angular variation between sensitive axis of the magnetic sensor and geomagnetic field can be neglected. As to blood disturbance mechanism, the change of blood volume plays a decisive role while the effect of blood velocity altera-tion is negligible.展开更多
研究了脉搏传播时间(PTT)变异性谱分析的预处理过程,提出了以平均心动频率作为重采样率的均匀重采样方法和基于平均心动频率控制的小波去趋势(WFC,wavelet detrend based on frequency control)方法。试验结果表明:1)采用平均心动频率...研究了脉搏传播时间(PTT)变异性谱分析的预处理过程,提出了以平均心动频率作为重采样率的均匀重采样方法和基于平均心动频率控制的小波去趋势(WFC,wavelet detrend based on frequency control)方法。试验结果表明:1)采用平均心动频率作为重采样率,可以保证在信号不失真的情况下达到均匀采样的目的;2)相比于平滑先验(SDA,smoothness prior approach)方法和经验模态分解(EMD,empirical mode decomposition)方法,WFC方法得出了较好的去除非平稳趋势效果,同时在处理大数据量序列时有更高的运行效率。展开更多
文摘Continuous non-invasive blood pressure (BP) measurement can be realized by using pulse transit time (PTT) based on electrocardiogram (ECG) and pulse wave signal. Modulated magnetic signature of blood (MMSB) is a promising approach to obtain PTT. The origin of MMSB is critical to establish the relationship between MMSB and BP. In this paper, two possible origins of MMSB, blood disturbance mechanism and angular variation mechanism, are analyzed and verified through three control experi-ments under different conditions. The influence of blood velocity alteration and blood volume alteration on magnetic field is investigated though blood flow simulation sys-tem. It is found that MMSB comes mainly from the periodic blood flow while the per-turbation caused by angular variation between sensitive axis of the magnetic sensor and geomagnetic field can be neglected. As to blood disturbance mechanism, the change of blood volume plays a decisive role while the effect of blood velocity altera-tion is negligible.
文摘研究了脉搏传播时间(PTT)变异性谱分析的预处理过程,提出了以平均心动频率作为重采样率的均匀重采样方法和基于平均心动频率控制的小波去趋势(WFC,wavelet detrend based on frequency control)方法。试验结果表明:1)采用平均心动频率作为重采样率,可以保证在信号不失真的情况下达到均匀采样的目的;2)相比于平滑先验(SDA,smoothness prior approach)方法和经验模态分解(EMD,empirical mode decomposition)方法,WFC方法得出了较好的去除非平稳趋势效果,同时在处理大数据量序列时有更高的运行效率。
