王 璐,王仲怡,吴子悦,徐敬傲,蒋芳芳,徐礼胜,于 滨.基于聚偏氟乙烯传感器的心冲击信号影响因素分析[J].集成技术,2020,(1):36-44
基于聚偏氟乙烯传感器的心冲击信号影响因素分析
The Analysis of the Influence Factors on the Acquisition ofBallistocardiography Signal Based on Polyvinylidene Fluoride Sensor
  
DOI:10.12146/j.issn.2095-3135.20191201001
中文关键词:  心冲击信号;聚偏氟乙烯传感器;非接触体征监护;呼吸暂停
英文关键词:ballistocardiography; polyvinylidene fluoride sensor; non-contact monitoring; apnea
基金项目:国家自然科学基金项目(61773110、61801104);辽宁省自然科学基金项目(20170540312);中央高校基本科研业务费项 目(N181604006)
作者单位
王 璐 东北大学计算机科学与工程学院 沈阳 110819 
王仲怡 东北大学医学与生物信息工程学院 沈阳 110819 
吴子悦 东北大学医学与生物信息工程学院 沈阳 110819 
徐敬傲 东北大学医学与生物信息工程学院 沈阳 110819 
蒋芳芳 东北大学医学与生物信息工程学院 沈阳 110819 
徐礼胜 东北大学医学与生物信息工程学院 沈阳 110819;沈阳东软智能医疗科技研究院有限公司 沈阳 110167 
于 滨 埃因霍芬理工大学工业设计中心 埃因霍芬 5600 
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中文摘要:
      心冲击图(Ballistocardiography,BCG)记录了人体心脏做机械运动时对外界的作用力信号,不 仅能反应心脏节律,还能作为评估心脏血流动力学参数变化的有效依据。但 BCG 信号的采集过程中影 响因素较多,这些严重地影响着信号形态特征,进而导致对其进行血流动力学分析得不准确。因此, 该文采用聚偏氟乙烯压电薄膜传感器,设计并实现了能够有效抑制外界干扰、具有高信噪比的 BCG 信 号采集系统。基于该系统研究了传感器位置、床垫硬度、躺卧姿势对采集系统稳定性的影响,并分析 了在呼吸暂停情况下采集系统的检测性能。结果表明,在卧姿采集 BCG 信号时,应选择硬质床垫(如 木板床),并将传感器摆在心脏正下方的位置,使受试者保持平躺姿势。满足上述条件时,所采集的 BCG 信号波形最佳,H、J、K 波波形明显,且具有较强的节律性,有利于提高后续血流动力学分析的 精度。
英文摘要:
      Ballistocardiography (BCG) is a technique that records the force signal caused by the ejection of blood into the arteries with each heartbeat. BCG signal can be acquired non-invasively by using polyvinylidene fluoride (PVDF) sensors integrated in a mattress or chair. In addition to being able to show cardiac rhythms, BCG signals can also be used for assessing cardiac hemodynamic changes. However, body movements, sensor displacement, etc. can easily influence the morphological characteristics of BCG signal, which makes its hemodynamic analysis difficult and even impossible. In this paper, we developed a BCG signal acquisition system using PVDF sensor. The proposed system can effectively suppress external electromagnetic interference and result in high signal-to-noise ratio. Specifically, we systematically investigated the effects of sensor position, mattress hardness and user’s posture on the stability of the BCG acquisition system, and analyzed the detection performance under apnea and the difference in gender characteristics of BCG signals. The evaluation results demonstrate that when collecting BCG signals in a lying position, it is better to use a hard mattress (such as a wooden bed) and place the sensor directly below the hear. When the above conditions are met, the collected BCG signals waveform is the optimal; the H, J, and K waves are significant and have a strong rhythm, which is conducive to improving the accuracy of hemodynamic analysis.
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