System and method for detecting signal artifacts
First Claim
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1. A device comprising:
- a controller;
a memory coupled to the controller; and
an input interface which receives at least two event signals,wherein the controller determines;
a global correlation matrix for the at least two event signals over a first period of time,a local correlation matrix for the at least two event signals over a second period of time which is shorter than the first period of time,a correlation vector indicative of a deviation between the local correlation matrix and the global correlation matrix,an average of the correlation vector, andwhether an artifact was detected in one of the at least two event signals from the correlation vector and the average of the correlation vector.
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Abstract
A method and system are disclosed that detect signal artifacts in one or more event signals. The system and method may be used with a patient monitoring apparatus that adapts to a patient'"'"'s condition and distinguishes between clinically significant changes in the patient'"'"'s state verse clinically insignificant changes.
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Citations
16 Claims
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1. A device comprising:
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a controller; a memory coupled to the controller; and an input interface which receives at least two event signals, wherein the controller determines; a global correlation matrix for the at least two event signals over a first period of time, a local correlation matrix for the at least two event signals over a second period of time which is shorter than the first period of time, a correlation vector indicative of a deviation between the local correlation matrix and the global correlation matrix, an average of the correlation vector, and whether an artifact was detected in one of the at least two event signals from the correlation vector and the average of the correlation vector. - View Dependent Claims (2, 3, 5, 6)
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4. A patient monitoring system comprising:
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a controller; a memory coupled to the controller; an input interface configured to receive at least two event signals, the at least two event signals being patient monitored data signals; wherein the controller determines whether an artifact is detected by; repeatedly determining a global correlation for the at least two event signals over a first period of time, repeatedly determining a local correlation for the at least two event signals over a second period of time which is shorter than the first period of time, repeatedly determining a current deviation between the local correlation and the global correlation, determining an average deviation of a plurality of the current deviations, and determining whether an artifact was detected in one of the at least two event signals based on a difference between the current deviation and the average deviation; and an alarm indicator coupled to the controller, the alarm indicator being triggered if at least one of the event signals crosses a preset threshold value and the controller determines that no artifact was detected in the at least one event signal.
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7. A method for detecting a signal artifact in event signals, the method comprising the steps of:
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receiving at least two event signals; determining a global correlation for the at least two event signals over a first period of time; determining a local correlation for the at least two event signals over a second period of time which is shorter than the first period of time; repeatedly determining a current deviation between the local correlation and the global correlation; determining an average deviation from a plurality of the determined current deviations; comparing the current deviation and the average deviation to determine whether an artifact was detected in one of the at least two event signals; and triggering an alarm indication in response to determining that an artifact was detected. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for detecting a signal artifact in an event signal, comprising:
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means for receiving at least two event signals; means for determining a global correlation for the at least two event signals over a first period of time; means for determining a local correlation for the at least two event signals over a second period of time which is shorter than the first period of time; means for determining a deviation between a local correlation vector and a global correlation vector; means for determining an average deviation from the deviation; and means for determining whether an artifact was detected in one of the at least two event signals based upon the average deviation. - View Dependent Claims (14, 15, 16)
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Specification