Method of analyzing and processing signals
First Claim
1. A method for determining an artifact pertaining to physiological movement, comprising:
- obtaining a photoplethysmographic (PPG) biosignal from a subject at least in part using a signal acquisition unit;
decomposing, using a signal processor, the PPG biosignal at least in part using a wavelet transform analysis to obtain transform data, the transform data comprising a time axis, a scale axis, and an amplitude axis;
identifying, using the signal processor, a plurality of amplitude maxima points in the transform data in the direction of the time axis;
setting, using the signal processor, an amplitude threshold;
determining, using the signal processor, the artifact pertaining to physiological movement based at least in part on the plurality of amplitude maxima points and the amplitude threshold;
determining, using the signal processor, a physiological parameter of the subject based at least in part on the PPG biosignal, the physiological parameter comprising at least on of;
respiration rate, pulse rate, and oxygen saturation; and
determining, using the signal processor, a confidence measurement pertaining to the physiological parameter based at least in part on determining the artifact.
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Abstract
A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.
126 Citations
18 Claims
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1. A method for determining an artifact pertaining to physiological movement, comprising:
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obtaining a photoplethysmographic (PPG) biosignal from a subject at least in part using a signal acquisition unit; decomposing, using a signal processor, the PPG biosignal at least in part using a wavelet transform analysis to obtain transform data, the transform data comprising a time axis, a scale axis, and an amplitude axis; identifying, using the signal processor, a plurality of amplitude maxima points in the transform data in the direction of the time axis; setting, using the signal processor, an amplitude threshold; determining, using the signal processor, the artifact pertaining to physiological movement based at least in part on the plurality of amplitude maxima points and the amplitude threshold; determining, using the signal processor, a physiological parameter of the subject based at least in part on the PPG biosignal, the physiological parameter comprising at least on of;
respiration rate, pulse rate, and oxygen saturation; anddetermining, using the signal processor, a confidence measurement pertaining to the physiological parameter based at least in part on determining the artifact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A monitoring system for determining an artifact pertaining to physiological movements, the system comprising:
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a signal acquisition unit attachable to a subject to obtain a photoplethysmographic (PPG) biosignal; and a signal processor configured to; decompose the PPG biosignal at least in part using a wavelet transform analysis to obtain transform data, the transform data comprising a time axis, a scale axis, and an amplitude axis; identify a plurality of amplitude maxima points in the transform data in the direction of the time axis; set an amplitude threshold; determine the artifact pertaining to physiological movement based at least in part on the plurality of amplitude maxima points and the amplitude threshold; determine a physiological parameter of the subject based at least in part on the PPG biosignal, the physiological parameter comprising at least on of;
respiration rate, pulse rate, and oxygen saturation; anddetermine a confidence measurement pertaining to the physiological parameter based at least in part on determining the artifact. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification