DEVICE, SYSTEM AND METHOD FOR DETECTING APNOEA OF A SUBJECT

• US 20170119304A1
• Filed: 06/04/2015
• Published: 05/04/2017
• Est. Priority Date: 06/06/2014
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: JEANNE, Vincent
• Granted Patent: US 10,524,725 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/4818 Sleep apnoea
• CPC Class Codes: A61B 5/7246 using correlation, e.g. template matching or determination of similarity

Abstract

The present invention relates to device, system and method for unobtrusively and reliably detecting apnoea of a subject (2). The proposed device comprises an input unit (11) for receiving image data of subject, said image data including a sequence of images over time, a cardiac activity extraction unit (12) for extracting from said image data a cardiac activity signal representing the subject'"'"'s cardiac activity from a skin area of the subject using remote photoplethysmography, a motion signal extraction unit (14) for extracting from said image data a motion signal representing motion of a subject'"'"'s body part caused by breathing of the subject, an analysis unit (16) for determining the similarity between said cardiac activity signal and said motion signal, and an decision unit (18) for detecting apnoea of the subject based on the determined similarity.

Claims

1. A device for detecting apnoea of a subject, comprising:

an input unit for receiving image data of subject, said image data including a sequence of images over time,

a cardiac activity extraction unit for extracting from said image data a cardiac activity signal representing the subject'"'"'s cardiac activity from a skin area of the subject using remote photoplethysmography,

a motion signal extraction unit for extracting from said image data a motion signal representing motion of a subject'"'"'s body part caused by breathing of the subject,

an analysis unit for determining the similarity between said cardiac activity signal and said motion signal, and

an decision unit for detecting apnoea of the subject based on the determined similarity.

2. The device as claimed in claim 1,

wherein the analysis unit is configured to determine a similarity measure representing said similarity and

wherein the decision unit is configured to detect apnoea by comparing said similarity measure against a predetermined threshold and/or earlier determined similiarity measures.

3. The device as claimed in claim 1,

further comprising a movement detection unit for detecting movement of at least a part of the subject by use of said image data,

wherein the decision unit is configured to take detected movement into account in the detection of apnoea of the subject based on the determined similarity.

4. The device as claimed in claim 1,

wherein the input unit is configured to receive movement information representing movement of at least a part of the subject,

wherein the decision unit is configured to take the received movement information into account in the detection of apnoea of the subject based on the determined similarity.

5. The device as claimed in claim 1,

further comprising a measurement area detection unit for detecting in said image data a skin area for extraction of said cardiac activity signal and/or a body part area for extraction of said motion signal.

6. The device as claimed in claim 5,

wherein said measurement area detection unit is configured to detect a skin area and/or a body part area by means of image segmentation and/or object detection.

7. The device as claimed in claim 1,

wherein the analysis unit is configured to determine the similarity by determining the correlation between said cardiac activity signal and said motion signal over a time window.

8. The device as claimed in claim 1,

wherein the analysis unit is configured to determine the similarity by comparing fundamental frequencies present in said cardiac activity signal and said motion signal.

9. The device as claimed in claim 8,

wherein the analysis unit is configured to determine the similarity by determining the Euclidian distance between the fundamental frequencies, the ratio between the fundamental frequencies and/or the energy ratio of the fundamental frequencies, in particular at the heart rate frequency.

11. A System for detecting apnoea of a subject, comprising:

an imaging unit for acquiring image data of subject, said image data including a sequence of images over time, and

a device as claimed in claim 1 for detecting apnoea of a subject based on the acquired image data.

12. The system as claimed in claim 11 comprising

a motion sensor for acquiring motion information representing motion of at least a part of the subject.

10. A method for detecting information allowing the detection of apnoea of a subject, comprising:

receiving image data of subject, said image data including a sequence of images over time,

extracting from said image data a cardiac activity signal representing the subject'"'"'s cardiac activity from a skin area of the subject using remote photoplethysmography,

extracting from said image data a motion signal representing motion of a subject'"'"'s body part caused by breathing of the subject,

determining the similarity between said cardiac activity signal and said motion signal, said similarity allowing the detection of apnoea of the subject.

13. A computer program comprising program code means for causing a computer to carry out the steps of the method as claimed in claim 10 when said computer program is carried out on a computer.