Method to quantify photoplethysmogram (PPG) signal quality

A technology of photoplethysmography and signal quality, which is applied in the direction of pattern recognition, application, and informatics in signals, and can solve problems such as limited waveform evaluation and difficult PPG waveform amplitude

Active Publication Date: 2018-07-17
KONINKLJIJKE PHILIPS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, PPG waveform amplitudes are difficult to interpret, which limits waveform evaluation based on amplitude thresholds

Method used

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  • Method to quantify photoplethysmogram (PPG) signal quality
  • Method to quantify photoplethysmogram (PPG) signal quality
  • Method to quantify photoplethysmogram (PPG) signal quality

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Embodiment Construction

[0013] The ability to characterize the signal quality of the PPG waveform over time and evaluate the signal quality of smaller segments is very useful when the PPG signal is used to calculate other clinical parameters. According to one embodiment, a framework for evaluating PPG waveforms on a beat-by-beat basis is provided. First, a set of features is derived from the PPG waveform for evaluation on a beat-by-beat basis. Since the actual amplitude of the PPG signal is unknown, there is no need to use amplitude-based features. Instead, time- and / or shape-based features are derived from the PPG waveform. Second, the set of features is used to provide an indicator of each beat and overall waveform quality. Additionally, each feature can be assigned a different weight, which allows tailoring the PPG signal quality metric for different applications.

[0014] The PPG signal gives a measure of blood oxygenation level as a function of time. This information is a very useful vital s...

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Abstract

When evaluating the quality of photoplethysmography (PPG) signal (52) measured from a patient monitor (e.g., a finger sensor or the like), multiple features of the PPG signal are extracted and analyzed to facilitate assigning a score to the PPG signal or portions (e.g., heartbeats) thereof. Heartbeats in the PPG signal are segmented out using concurrently captured electrocardiograph (ECG) signal (50), and for each heartbeat, a plurality of extracted features are analyzed. If all extracted features satisfy one or more predetermined criteria for each feature, then the heartbeat waveform is compared to a predefined heartbeat template. If the waveform matches the template (e.g., within a predetermined match percentage or the like), then the heartbeat is classified as 'clean'. If the heartbeatdoes not patch the template, or if one or more of the extracted features fails to satisfy its one or more predetermined criteria, the heartbeat is classified as 'noisy'.

Description

technical field [0001] The present invention finds use in patient monitoring systems and methods. However, it should be understood that the described techniques may also be applicable to vital sign analysis systems, other patient measurement systems, and the like. Background technique [0002] Photoplethysmography (PPG) is a method used to non-invasively measure changes in blood volume during the cardiac cycle. PPG uses changes in the absorption of light by tissues to measure differences in oxygenation levels and infer changes in blood volume. PPG is clinically used to measure the percentage of blood oxygen saturation (SpO2). PPG waveform analysis is also used to calculate other clinical parameters such as pulse arrival time, estimate blood pressure, etc. PPG measuring devices are small, portable and easy to use; thus they are widely used in hospitals and clinics to monitor patients. [0003] A major challenge in PPG signal measurement and waveform interpretation is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B5/024A61B5/0245A61B5/0456A61B5/021G06K9/00A61B5/352
CPCA61B5/7203A61B5/7221A61B5/7246A61B5/7264A61B5/02116A61B5/02125A61B5/02416A61B5/0245G16H50/20A61B5/352G06F2218/14G06F2218/10A61B5/35A61B5/14552A61B5/7207
Inventor E·高希C·M·波特斯布兰东
Owner KONINKLJIJKE PHILIPS NV
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