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US 10,292,594 B2Granted
Method and system for contactless detection of cardiac activity
AssigneeRochester Institute of Technology
InventorsGill R. Tsouri, Sohail Dianat
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Abstract
A system and method include contactless detecting and tracking cardiac activity by making use of a feedback control system, such as a Phase Locked Loop (PLL), in real-time or from a prerecorded signal stream.
Claims15
A method for contactless detection of cardiac activity of a subject, comprising:
- monitoring blood volume pulse in real-time comprising detecting a first pulse resulting from a first contraction of the heart prior to the following contraction of the heart on a pulse by pulse basis through the skin of the subject with a contactless sensor by capturing with the sensor incident light reflected off the skin representing the pulse of the subject;
- converting an optical signal of the reflected light to an electrical signal comprising a frequency;
- feeding the captured electrical signal to a feedback control system;
- locking and tracking over time the frequency of the captured electrical signal within a range corresponding to an expected range of heart rate using the feedback control system;
- measuring the frequency of the electrical signal at the output of the feedback control system;
- extracting the pulse rate in real-time on a pulse by pulse basis from the measured frequency of the electrical signal at the output of the feedback control system;
- tracking the pulse rate to detect pulse by pulse variability of the subject's heart rate in real-time;
- and
- analyzing the tracked heart rate variability in real-time on a beat by beat basis to determine a physiological condition of the subject.
6 more elements
Dependencies are inferred from the claim text.