Moço A V, Mondragon L Z, Wang W, Stuijk S, de Haan G
Department of Electrical Engineering, Eindhoven University of Technology, 5612AZ Eindhoven, Netherlands.
Physiol Meas. 2017 Jul 28;38(8):1576-1598. doi: 10.1088/1361-6579/aa7d43.
The feasibility of a camera-based extraction of carotid distension waveforms offers the prospect of a user-friendly alternative to laser Doppler velocimetry (LDV) or accelerometry-based systems. Upon supplementary calibration of vessel wall displacement to arterial pressure, our system may also be an appealing alternative to applanation tonometry for extracting cardiac-related features from the central pulse pressure waveform.
This paper describes the application of camera-based micro-motion imaging to extract health-related features from the contour of the carotid displacement waveform.
We build on the assumption that the cardiac-related frequency components of the skin motion (sMOT) waveform, as acquired at the vicinity of the carotid artery under uneven illumination, receive a dominant contribution from the carotid wall displacement. We propose a two-step approach at which sMOT signals are queried based on the local amplitude of remote-photoplethysmography sensors spanning the neck's skin and then ensemble-averaged for cardiovascular health assessment.
The feasibility of the system is demonstrated for assessing stiffness index, augmentation pressure, augmentation index and reflection magnitude on a dataset comprising 28 participants (ages 23 to 62 yrs; 22 males).
Although presented here as a standalone system, micro-motion imaging can be an auxiliary technique for improving sensor placement and signal quality of tonometric or LDV technologies.
基于摄像头提取颈动脉扩张波形的可行性为激光多普勒测速法（LDV）或基于加速度测量的系统提供了一种用户友好的替代方案。在对血管壁位移与动脉压力进行补充校准后，我们的系统对于从中心脉压波形中提取与心脏相关的特征而言，也可能是一种替代压平眼压计的有吸引力的方法。
本文描述了基于摄像头的微运动成像在从颈动脉位移波形轮廓中提取与健康相关特征方面的应用。
我们基于这样的假设，即在不均匀光照下在颈动脉附近获取的皮肤运动（sMOT）波形中与心脏相关的频率成分主要来自颈动脉壁位移。我们提出了一种两步法，即根据跨越颈部皮肤的远程光电容积脉搏波描记术传感器的局部幅度来查询sMOT信号，然后对其进行总体平均以进行心血管健康评估。
在一个包含28名参与者（年龄23至62岁；22名男性）的数据集上，证明了该系统在评估硬度指数、增强压力、增强指数和反射幅度方面的可行性。
尽管本文将微运动成像作为一个独立系统呈现，但它可以作为一种辅助技术，用于改善眼压测量或LDV技术的传感器放置和信号质量。
