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首页> 外文会议>Optical diagnostics and sensing XVIII: Toward Point-of-Care Diagnostics >Noncontact sphygmomanometer based on pulse-wave transit time between the face and hand
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Noncontact sphygmomanometer based on pulse-wave transit time between the face and hand

机译：基于脸与手之间脉搏波传播时间的非接触式血压计

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摘要

Systolic blood pressure (SBP) is highly sensitive to various factors such as psychological stress, and hence its continuous monitoring is essential to evaluate different health conditions. However, conventional sphygmomanometers cannot continuously measure SBP given the time-consuming setup based on a pressure cuff. Moreover, continuous biological signal monitoring is more comfortable when no sensors are attached. A solution for continuous SBP estimation is based on pulse transit time (PTT), which determines the time difference between two pulse waves at different body parts. In previous studies, we successfully measured the PTT using a contactless setup composed by two digital color cameras recording the face and hand of subjects. Then, the acquired images were transformed into blood volume by combining multiple regression analysis and a Monte Carlo method. As a result, the delay among images allowed to determine the PPT from pulse waves. In this study, we simultaneously measured SBP and PTT by using a sphygmomanometer and the two cameras, respectively. We evaluated SBP increases (i.e.. stressful situations) and the corresponding PPT by asking participants to either grasp a handgrip or momentarily interrupting breath. We also determined the SBP and PTT without asking for such exercises. Comparison results show that the mean PTT under stress was significantly lower than that without stress, which is consistent with an increased SBP. Finally, we related the SBP and PTT by a nonlinear formula with a coefficient of determination of 0.59, thus confirming the effectiveness of the proposed system.
机译：收缩压（SBP）对各种因素（例如心理压力）高度敏感，因此对其进行连续监测对于评估不同的健康状况至关重要。但是，鉴于基于压力袖带的耗时设置，传统的血压计无法连续测量SBP。此外，当没有连接传感器时，连续的生物信号监测将更加舒适。连续SBP估计的解决方案基于脉冲传播时间（PTT），该时间确定了两个脉冲波在人体不同部位之间的时间差。在以前的研究中，我们使用非接触式设置成功地测量了PTT，该设置由两个数码彩色相机组成，记录了对象的面部和手部。然后，通过将多元回归分析和蒙特卡洛方法相结合，将获取的图像转换为血量。结果，图像之间的延迟允许从脉搏波确定PPT。在这项研究中，我们分别使用血压计和两个摄像机同时测量了SBP和PTT。我们通过要求参与者抓住手柄或暂时中断呼吸来评估SBP升高（即压力状态）和相应的PPT。我们还确定了SBP和PTT，而无需进行此类练习。比较结果表明，压力下的平均PTT显着低于无压力下的PTT，这与SBP升高是一致的。最后，我们通过确定系数为0.59的非线性公式将SBP和PTT进行关联，从而确认了所提出系统的有效性。

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