Device and method for obtaining pulse transit time and/or pulse wave velocity information of a subject
AssigneeKoninklijke Philips N.V.
InventorIhor Olehovych Kirenko
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Abstract
The present invention relates to a device and method for obtaining pulse transit time and/or pulse wave velocity information of a subject (14). Based on a set of image frames (19) of a subject (14) and detected motion of body parts of the subject (14) regions of interest are selected from different non-moving body parts and pulse transit time and/or pulse wave velocity information is obtained from acquired PPG signals extracted from different regions of interest and the respective determined physical distance between the respective regions of interest.
Claims20
A device for obtaining pulse transit time and/or pulse wave velocity information of a subject, comprising
- an interface for receiving a set of image frames of a subject acquired by an imaging unit,
- a motion detection unit for detecting motion of body parts of the subject,
- an ROI selection unit for selecting at least two regions of interest at the body parts of the subject within said set of image frames,
- a signal extraction unit for extracting at least two photoplethysmographic (PPG) signals from at least two selected regions of interest from said set of image frames,
- a motion correction unit for controlling said ROI selection unit to select only regions of interest at substantially unmoved body parts and/or for controlling said signal extraction unit to extract one of the PPG signals only from regions of interest at substantially unmoved body parts or to correct the PPG signals extracted from regions of interest at moving body parts,
- a distance determination unit for determining within a single one of the image frames the physical distance between the selected regions of interest, and
- a calculation unit for:
- determining at least one of pulse transit time and pulse wave velocity information from the PPG signals extracted from different regions of interest and the respective determined physical distance between the respective regions of interest;
- and
- determining at least one body map for the body parts wherein the at least one body map indicates the determined pulse transit time and/or pulse wave velocity information and/or arterial blood oxygen saturation at the body parts derived from the PPG signals.
A method of obtaining pulse transit time and/or pulse wave velocity information of a subject, comprising
- receiving a set of image frames of a subject acquired by an imaging unit,
- detecting motion of body parts of the subject,
- selecting at least two regions of interest at body parts of the subject within said set of image frames,
- extracting at least two photoplethysmographic (PPG) signals from at least two selected regions of interest from said set of image frames,
- controlling said ROI selection to select only regions of interest at substantially unmoved body parts and/or for controlling said signal extraction to extract a PPG signal only from regions of interest at substantially unmoved body parts or to correct PPG signals extracted from regions of interest at moving body parts,
- determining a physical distance between selected regions of interest within an image frame, and
- determining pulse transit time and/or pulse wave velocity information from the PPG signals extracted from different regions of interest and the respective determined physical distance between the respective regions of interest by determining a body map indicating the determined pulse transit time and/or pulse wave velocity information for the body parts.
A device for obtaining at least one of pulse transit time and pulse wave velocity information of a subject, the device comprising:
- an interface configured to receive a set of image frames of a subject acquired by a camera;
- and
- at least one processor programmed to:
- detect motion of body parts of the subject;
- select at least two regions of interest at the body parts of the subject within said set of image frames;
- extract at least two photoplethysmographic (PPG) signals from at least two selected regions of interest from said set of image frames at substantially unmoved body parts;
- determine within one of the image frames the physical distance between the selected regions of interest;
- determine at least one of pulse transit time and pulse wave velocity information from the PPG signals extracted from different regions of interest and the respective determined physical distance between the respective regions of interest;
- determine vital sign information from the PPG signals extracted from one or more selected regions of interest including determining an arterial blood oxygen saturation at the body parts and determining a body map indicating the determined arterial blood oxygen saturation for the body parts.
Dependencies are inferred from the claim text.