US 12,329,503 B2
Method and system for evaluating the quality of ratio of ratios values
Gurvan Priem, Rennes (FR); and Quentin Bodinier, Lyons (FR)
Assigned to BIOSENCY, Saint-Grégoire (FR)
Appl. No. 17/764,311
Filed by BIOSENCY, Saint-Grégoire (FR)
PCT Filed Oct. 2, 2020, PCT No. PCT/EP2020/077727
§ 371(c)(1), (2) Date Mar. 28, 2022,
PCT Pub. No. WO2021/064212, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 19306266 (EP), filed on Oct. 2, 2019.
Prior Publication US 2022/0369943 A1, Nov. 24, 2022
Int. Cl. A61B 5/024 (2006.01); A61B 5/00 (2006.01); A61B 5/1455 (2006.01)
CPC A61B 5/02416 (2013.01) [A61B 5/14551 (2013.01); A61B 5/72 (2013.01); A61B 5/681 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A computer-implemented method for evaluating quality of ratio of ratios, RR, values computed for at least three photoplethysmographic, PPG, signals corresponding to distinct wavelengths, wherein each PPG signal comprises successive heartbeat signal segments, said method comprising:
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 tb,g[n] from a third PPG signal corresponding to a third wavelength;
segmenting the first and second PPG signals into a plurality of signal segments, each signal segment corresponding to one heartbeat, using the sequence of heartbeat instants tb,g[n] extracted from the third PPG signal,
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.