DETERMINING CARDIAC ARRHYTHMIA FROM A VIDEO OF A SUBJECT BEING MONITORED FOR CARDIAC FUNCTION
First Claim
1. A method for detecting cardiac arrhythmia from signals generated from video images captured of a subject of interest being monitored for cardiac function in a non-contact remote sensing environment, the method comprising:
- receiving a time-series signal generated from video images captured of a region of exposed skin where a photoplethysmographic (PPG) signal of a subject of interest can be registered, said video comprising video images captured by at least one imaging channel capturing PPG signals;
performing signal separation on said time-series signal to extract a PPG signal for said subject;
detecting peak-to-peak pulse points in said PPG signal;
analyzing said pulse points to obtain peak-to-peak pulse dynamics; and
determining whether a cardiac arrhythmia exists based on said pulse dynamics.
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Abstract
What is disclosed is a system and method for processing a time-series signal generated by video images captured of a subject of interest in a non-contact, remote sensing environment such that the existence of a cardiac arrhythmia can be determined for that subject. In one embodiment, a time-series signal generated is received. The time-series signal was generated from video images captured of a region of exposed skin where photoplethysmographic (PPG) signals of a subject of interest can be registered. Signal separation is performed on the time-series signal to extract a photoplethysmographic signal for the subject. Peak-to-peak pulse points are detected in the PPG signal using an adaptive threshold technique with successive thresholds being based on variations detected in previous magnitudes of the pulse peaks. The pulse points are then analyzed to obtain peak-to-peak pulse dynamics. The existence of cardiac arrhythmias is determined for the subject based on the pulse dynamics.
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Citations
25 Claims
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1. A method for detecting cardiac arrhythmia from signals generated from video images captured of a subject of interest being monitored for cardiac function in a non-contact remote sensing environment, the method comprising:
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receiving a time-series signal generated from video images captured of a region of exposed skin where a photoplethysmographic (PPG) signal of a subject of interest can be registered, said video comprising video images captured by at least one imaging channel capturing PPG signals; performing signal separation on said time-series signal to extract a PPG signal for said subject; detecting peak-to-peak pulse points in said PPG signal; analyzing said pulse points to obtain peak-to-peak pulse dynamics; and determining whether a cardiac arrhythmia exists based on said pulse dynamics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for detecting cardiac arrhythmia from signals generated from video images captured of a subject of interest being monitored for cardiac function in a non-contact remote sensing environment, the system comprising:
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a display device; and a processor in communication with a memory, said processor executing machine readable instructions for performing; receiving a time-series signal generated from video images captured of a region of exposed skin where a photoplethysmographic (PPG) signal of a subject of interest can be registered, said video comprising video images captured by at least one imaging channel capturing PPG signals; performing signal separation on said time-series signal to extract a PPG signal for said subject; detecting peak-to-peak pulse points in said PPG signal; analyzing said pulse points to obtain peak-to-peak pulse dynamics; determining whether a cardiac arrhythmia exists based on said pulse dynamics; and communicating said pulse dynamics to said display device. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification