Multivariate residual-based health index for human health monitoring
First Claim
Patent Images
1. A method for monitoring the health of a human, comprising:
- obtaining sensor data from a human;
generating with a programmed microprocessor a plurality of features from said sensor data, characteristic of physiological health of said human;
estimating with a programmed microprocessor values for said features characteristic of normal human physiology using a multivariate model, based on the values of said generated plurality of features;
differencing with a programmed microprocessor the estimated values and the generated features to provide a set of residuals for the features, wherein each residual is the difference between the particular feature value expected according to said model, and the corresponding feature value generated from said sensor data; and
determining with a programmed microprocessor a likelihood that said set of residuals is representative of a pattern of normal residuals, by using a Gaussian mixture model based on a set of normal residual reference patterns to approximate a probability distribution for normal residual patterns, and to compute said likelihood that said set of residuals belongs to the distribution, whereby said likelihood consolidates the behaviors of the individual residuals for each of the features into one overall index; and
applying with a programmed microprocessor a test to said likelihood to render a decision whether the generated features are characteristic of normal physiological behavior to provide an early indication of deviation of the physiological health of said human from normal.
7 Assignments
0 Petitions
Accused Products
Abstract
Ambulatory or in-hospital monitoring of patients is provided with early warning and prioritization, enabling proactive intervention and amelioration of both costs and risks of health care. Multivariate physiological parameters are estimated by empirical model to remove normal variation. Residuals are tested using a multivariate probability density function to provide a multivariate health index for prioritizing medical effort.
-
Citations
31 Claims
-
1. A method for monitoring the health of a human, comprising:
-
obtaining sensor data from a human; generating with a programmed microprocessor a plurality of features from said sensor data, characteristic of physiological health of said human; estimating with a programmed microprocessor values for said features characteristic of normal human physiology using a multivariate model, based on the values of said generated plurality of features; differencing with a programmed microprocessor the estimated values and the generated features to provide a set of residuals for the features, wherein each residual is the difference between the particular feature value expected according to said model, and the corresponding feature value generated from said sensor data; and determining with a programmed microprocessor a likelihood that said set of residuals is representative of a pattern of normal residuals, by using a Gaussian mixture model based on a set of normal residual reference patterns to approximate a probability distribution for normal residual patterns, and to compute said likelihood that said set of residuals belongs to the distribution, whereby said likelihood consolidates the behaviors of the individual residuals for each of the features into one overall index; and applying with a programmed microprocessor a test to said likelihood to render a decision whether the generated features are characteristic of normal physiological behavior to provide an early indication of deviation of the physiological health of said human from normal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 22, 23, 24, 25, 26, 27)
-
-
17. A method for monitoring the health of a human, comprising:
-
obtaining sensor data from a human; generating with a programmed microprocessor a plurality of features from said sensor data, characteristic of physiological health of said human; estimating with a programmed microprocessor values for said features characteristic of normal human physiology using a multivariate model, based on the values of said generated plurality of features; differencing with a programmed microprocessor the estimated values and the generated features to provide a set of residuals for the features, wherein each residual is the difference between the particular feature value expected according to said model, and the corresponding feature value generated from said sensor data; determining with a programmed microprocessor for each of a plurality of known health states, a likelihood that said set of residuals is representative of a pattern of residuals characteristic of that known health state, by using a Gaussian mixture model based on a set of residual reference patterns for the known health state to approximate a probability distribution for residual patterns of that known health state, and to compute said likelihood that said set of residuals belongs to the distribution; and applying with a programmed microprocessor a test to the plurality of likelihoods, each corresponding to one of the known health states, to render a ranking of which of said plurality of known health states the generated features are most characteristic of. - View Dependent Claims (18, 19, 20, 21, 28, 29, 30, 31)
-
Specification