Fraunhofer Institute for Digital Media Technology IDMT, Oldenburg Branch for Hearing, Speech and Audio Technology HSA, Marie-Curie-Straße 2, 26129 Oldenburg, Germany.
Medizinische Physik, Carl von Ossietzky University of Oldenburg, 26046 Oldenburg, Germany.
Sensors (Basel). 2024 May 31;24(11):3548. doi: 10.3390/s24113548.
Vital sign monitoring is dominated by precise but costly contact-based sensors. Contactless devices such as radars provide a promising alternative. In this article, the effects of lateral radar positions on breathing and heartbeat extraction are evaluated based on a sleep study. A lateral radar position is a radar placement from which multiple human body zones are mapped onto different radar range sections. These body zones can be used to extract breathing and heartbeat motions independently from one another via these different range sections. Radars were positioned above the bed as a conventional approach and on a bedside table as well as at the foot end of the bed as lateral positions. These positions were evaluated based on six nights of sleep collected from healthy volunteers with polysomnography (PSG) as a reference system. For breathing extraction, comparable results were observed for all three radar positions. For heartbeat extraction, a higher level of agreement between the radar foot end position and the PSG was found. An example of the distinction between thoracic and abdominal breathing using a lateral radar position is shown. Lateral radar positions could lead to a more detailed analysis of movements along the body, with the potential for diagnostic applications.
生命体征监测主要依赖精确但昂贵的接触式传感器。雷达等非接触式设备提供了一种很有前途的替代方案。在本文中，基于一项睡眠研究评估了横向雷达位置对呼吸和心跳提取的影响。横向雷达位置是指从该位置可以将多个人体区域映射到不同的雷达距离段上的雷达放置位置。通过这些不同的距离段，可以将这些身体区域彼此独立地用于提取呼吸和心跳运动。雷达被放置在床上方作为常规方法，也被放置在床边桌上以及床脚处作为横向位置。这些位置基于从健康志愿者收集的六个晚上的睡眠数据进行评估，这些数据使用多导睡眠图（PSG）作为参考系统。对于呼吸提取，三种雷达位置的结果相当。对于心跳提取，发现雷达脚端位置与 PSG 之间的一致性更高。还展示了使用横向雷达位置区分胸式和腹式呼吸的示例。横向雷达位置可以更详细地分析身体沿的运动，具有诊断应用的潜力。
