System for processing physiological data
First Claim
1. A system for computing a parameter value for a segment of a cardiac-related signal, the system comprising:
- a computer circuit configured and arranged toidentify at least one cardiac cycle within said segment,identify at least one feature point within the at least one cardiac cycle bydecomposing said cardiac-related signal into subcomponents,identifying subcomponents of the cardiac-related signal associated with a signal wave containing the at least one feature point, andcombining said identified subcomponents to construct an emphasis signal, and evaluating the emphasis signal to identify the at least one feature point,for the at least one identified feature point, compute an estimate of at least one of signal energy and noise energy for a cardiac cycle subsegment containing the at least one identified feature point, and determine a validity characteristic of the at least one feature point based upon the estimate, andcompute a parameter value based upon the determined validity characteristics of the at least one feature point.
2 Assignments
0 Petitions
Accused Products
Abstract
A parameter value is computed for a segment of a cardiac-related signal. In accordance with various example embodiments, a system includes a computer circuit configured to identify cardiac cycles within a segment of a cardiac-related signal, such as an ECG. At least one feature point is identified within the cardiac cycles. For each identified feature point, a signal-to-noise ratio (SNR) representative of the ratio of signal energy to noise energy is computed for a cardiac cycle subsegment containing the identified feature point. A validity characteristic of the feature point is determined based upon the signal-to-noise ratio, and a parameter value is computed by combining feature points contained within the segment, based upon the determined validity characteristics of the feature points.
-
Citations
25 Claims
-
1. A system for computing a parameter value for a segment of a cardiac-related signal, the system comprising:
a computer circuit configured and arranged to identify at least one cardiac cycle within said segment, identify at least one feature point within the at least one cardiac cycle by decomposing said cardiac-related signal into subcomponents, identifying subcomponents of the cardiac-related signal associated with a signal wave containing the at least one feature point, and combining said identified subcomponents to construct an emphasis signal, and evaluating the emphasis signal to identify the at least one feature point, for the at least one identified feature point, compute an estimate of at least one of signal energy and noise energy for a cardiac cycle subsegment containing the at least one identified feature point, and determine a validity characteristic of the at least one feature point based upon the estimate, and compute a parameter value based upon the determined validity characteristics of the at least one feature point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. A system for computing a parameter value for a segment of a cardiac-related signal, the system comprising:
a computer circuit configured and arranged to identify at least one cardiac cycle within said segment, identify at least one feature point of a signal wave within the at least one cardiac cycle, and for the at least one identified feature point, compute the estimate an estimate of at least one of signal energy and noise energy for a cardiac cycle subsegment containing the at least one identified feature point, wherein computing at least one of the signal energy and noise energy includes decomposing said cardiac-related signal into subcomponents, identifying a subsegment of the at least one cardiac cycle that includes the at least one feature point, when computing signal energy, estimating the signal energy by combining subcomponents within the subsegment that together contain a majority of the signal energy, and when computing noise energy, estimating the noise energy by combining residual subcomponents that are not combined in estimating the signal energy; determine a validity characteristic of the at least one feature point based upon the estimate; and compute a parameter value based upon the determined validity characteristics of the at least one feature point. - View Dependent Claims (11)
-
12. An article of manufacture, comprising:
a processor-readable storage medium configured with configuration data that when executed by a processor, cause the processor to perform steps including; identify cardiac cycles within a segment of a cardiac-related signal, identify at least one feature point within said cardiac cycles, for each of the identified feature points, compute a signal-to-noise ratio representative of the ratio of signal energy to noise energy for a cardiac cycle subsegment containing the identified feature point, and determine a validity characteristic of the feature point as a function of said signal-to-noise ratio, and compute a parameter value by combining feature points contained within said segment based upon the determined validity characteristics of the feature points.
-
13. An apparatus comprising:
a computer circuit configured and arranged to identify at least one cycle within an electrocardiogram signal, identify a feature point within a subsegment of the at least one cycle by decomposing said electrocardiogram signal into subcomponents, computing an emphasis signal using one or more subcomponents that together contain at least a majority of energy of a signal wave within the subsegment, and evaluating the emphasis signal to identify the feature point, and compute a validity characteristic of the feature point based upon at least one of estimated signal energy and estimated noise energy within the subsegment. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
24. An apparatus comprising:
a computer circuit configured and arranged to identify at least one cycle within an electrocardiogram signal, identify a feature point of a wave of the electrocardiogram signal within a subsegment of the at least one cycle, compute at least one of estimated signal energy and estimated noise energy in the subsegment by decomposing said electrocardiogram signal into subcomponents, identifying a cycle, identifying said subsegment containing said feature point, when estimating signal energy, combining wave subcomponents from within said subsegment that, combined, represent at least a majority of the energy of said wave, and when estimating noise energy, combining residual ones of the wave subcomponents that have not been combined in estimating the signal energy, and compute a validity characteristic of the feature point based upon at least one of estimated signal energy and the estimated noise energy within the subsegment.
-
25. An article of manufacture, comprising:
-
a processor-readable storage medium configured with configuration data that when executed by a processor, cause the processor to perform steps including; identify cycles within a segment of a pseudoperiodic physiological signal, identify at least one feature point within said cycles, for each of the identified feature points, compute an estimate of signal energy and noise energy in a cycle subsegment containing the identified feature point, and determine a validity characteristic of the feature point as a function of the relationship of said signal and noise energy estimates, and compute a parameter value by combining feature points based upon the determined validity characteristics of the feature points.
-
Specification