Method and system for evaluating the quality of ratio of ratios values
Inventors
PRIEM, Gurvan • BODINIER, Quentin
Assignees
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Publication Number
US-12329503-B2
Publication Date
2025-06-17
Expiration Date
Abstract
A method intended for the evaluation of the quality of ratio of ratios (RR) values computed for at least two photoplethysmographic (PPG) signals corresponding to distinct wavelengths, each PPG signal including successive heartbeat patterns. The method includes the steps of: segmenting the PPG signals into a plurality of signal segments each corresponding to one heartbeat pattern; for each given signal segment, computing a sequence of RR values; and evaluating, for each given signal segment, a quality index of the sequence of computed RR values on the basis of a computed heart rate and/or a measured peripheral temperature corresponding to the given signal segment.
Core Innovation
The invention evaluates the quality of ratio of ratios, RR, values computed for at least three photoplethysmographic, PPG, signals corresponding to distinct wavelengths. Each PPG signal comprises successive heartbeat signal segments, and the method segments the red-wavelength and infrared-wavelength PPG signals into heartbeat-corresponding segments using a sequence of heartbeat instants extracted from a third-wavelength PPG signal.
For each signal segment, a sequence of RR values is computed and a quality index is evaluated for the sequence of computed RR values. The quality index is evaluated on the basis of a computed heart rate and/or a measured peripheral temperature corresponding to the given signal segment.
The disclosed approach is implemented in a system that includes a segmentation module, a computation module, and an evaluation module. The segmentation module extracts heartbeat instants from a third PPG signal corresponding to a third wavelength and segments the red- and infrared-wavelength PPG signals into a plurality of signal segments each corresponding to one heartbeat pattern.
Claims Coverage
The provided claims include two independent claims, covering both a computer-implemented method and a system. Across the independent claims, the inventive features center on heartbeat-based segmentation of multi-wavelength PPG signals, segment-level computation of RR sequences, and evaluation of a quality index for RR sequences using a computed heart rate and/or a measured peripheral temperature.
Heartbeat-instants guided multi-wavelength segmentation of PPG signals into heartbeat segments
Segmenting a first PPG signal corresponding to a red wavelength and a second PPG signal corresponding to an infrared wavelength into a plurality of signal segments each corresponding to one heartbeat, by extracting a sequence of heartbeat instants t_b,g[n] from a third PPG signal corresponding to a third wavelength and segmenting the first and second PPG signals using the sequence of heartbeat instants t_b,g[n].
Segment-wise computation of RR sequences from segmented PPG signals
Computing, for each given signal segment, a sequence of RR values for the given signal segment.
Quality-index evaluation of RR sequences based on computed heart rate and/or measured peripheral temperature
Evaluating, for each given signal segment, a quality index of the sequence of computed RR values on the basis of a computed heart rate and/or a measured peripheral temperature corresponding to the given signal segment.
System modules for RR quality evaluation using heartbeat-pattern segmentation
A system comprising a segmentation module for segmenting a first PPG signal corresponding to a red wavelength and a second PPG signal corresponding to an infrared wavelength into a plurality of signal segments each corresponding to one heartbeat pattern; a computation module for computing, for each given signal segment, a sequence of RR values by extracting a sequence of heartbeat instants t_b,g[n] from a third PPG signal corresponding to a third wavelength and segmenting the first and second PPG signals using the heartbeat patterns extracted from the third PPG signal; and an evaluation module for evaluating, for each given signal segment, a quality index of the sequence of computed RR values on the basis of a computed heart rate and/or a measured peripheral temperature corresponding to the given signal segment.
The independent claims jointly cover using heartbeat instants extracted from a third PPG wavelength to segment red and infrared PPG signals into heartbeat segments, computing RR sequences per segment, and evaluating a segment-level quality index for the computed RR sequences based on a computed heart rate and/or a measured peripheral temperature, implemented either as a method or as a system with segmentation, computation, and evaluation modules.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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