Determining cardiac arrhythmia from a video of a subject being monitored for cardiac function
US8768438B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2012 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Aug 19, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/349
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.