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    • 4. 发明授权
    • Detecting a probe-off event in a measurement system
    • 检测测量系统中的探测事件
    • US08696585B2
    • 2014-04-15
    • US12242894
    • 2008-09-30
    • Paul Stanley AddisonJames Nicholas Watson
    • Paul Stanley AddisonJames Nicholas Watson
    • A61B5/02A61B8/14
    • G06K9/527A61B5/14551A61B5/6843A61B5/726
    • According to embodiments, techniques for detecting probe-off events are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, an energy decrease, a broadscale high-energy cone, a regular, repeated high-scale pattern, a low-scale information pattern; and a pulse band. The absence or presence of these and other characteristics, along with information about the characteristics, may be analyzed to detect a probe-off event. A confidence indicator may be calculated in connection with probe-off event detections and alarms may be generated when probe-off events occur.
    • 根据实施例,公开了用于检测探测事件的技术。 可以使用传感器或探针来获得来自受试者的体积描记器或光电体积描记器(PPG)信号。 可以执行信号的小波变换,并且可以至少部分地基于小波变换来生成缩放图。 可以确定缩放图的一个或多个特征。 确定的特性可以包括例如能量减少,大尺度高能量锥,规则的,重复的高比例图案,低比例的信息图案; 和脉冲带。 可以分析这些和其他特征的缺失或存在以及关于特征的信息以检测探测事件。 可以结合探测事件检测计算置信指标,并且可以在发生探测事件时生成报警。