Method to identify electrode placement
First Claim
1. A method to identify electrode placement in a system for acquiring a patient physiological signal through at least three electrodes applied to the patient, each electrode defining an electrical vector relative to a reference, the method comprising:
- acquiring the physiological signal; and
analyzing the physiological signal to determine whether the electrodes are incorrectly positioned or are positioned in a non-standard configuration.
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Accused Products
Abstract
An ECG signal is acquired in multiple channels, and sources of interference are filtered from the signals. A covariance matrix is then formed with the channels of data. The invention then employs matrix mathematics to discover a set of eigenvectors that organize the variability of data in a multi-dimensional space along new directions, orthogonal to each other and ranked in order of significance. For each eigenvector, a corresponding eigenvalue is calculated. In addition, coefficients are calculated which correspond to the portion of each eigenvector that is necessary to reconstruct each original vector. From the eigenvector solution of the covariance matrix, the angles between the eigenvectors and the original vectors are determined. The eigenvector coefficients and the angles between the eigenvectors and the original vectors are related by a cosine relationship. The angles calculated for each particular ECG test are compared to a reference set of angles to determine whether the electrodes are placed in the standard ECG electrode placement, an alternative electrode placement, or an incorrect electrode placement.
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Citations
30 Claims
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1. A method to identify electrode placement in a system for acquiring a patient physiological signal through at least three electrodes applied to the patient, each electrode defining an electrical vector relative to a reference, the method comprising:
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acquiring the physiological signal; and
analyzing the physiological signal to determine whether the electrodes are incorrectly positioned or are positioned in a non-standard configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method to identify electrode placement in a system for acquiring a patient physiological signal through at least three electrodes applied to the patient, each electrode defining an electrical vector relative to a reference, the method comprising:
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acquiring the physiological signal;
computing a covariance matrix of the physiological signal for the at least three electrodes;
computing eigenvectors and eigenvalues of the covariance matrix; and
evaluating the eigenvectors associated with the eigenvalues to determine the angles between the electrical vectors of the electrodes.
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17. A device for analyzing physiological patient data originally acquired from a patient via electrodes applied to the patient such that the electrodes define an electrical vector relative to a reference, the device comprising:
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an input for receiving the physiological patient data; and
an analysis module including software for analyzing the physiological data to determine the angles between the electrical vectors. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A device for analyzing physiological patient data originally acquired from a patient via electrodes applied to the patient such that the electrodes define an electrical vector relative to a reference, the device comprising:
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an input for receiving the physiological patient data; and
an analysis module for determining the position of the electrodes with respect to each other, and for comparing the positions of the electrodes to a standard in order to determine whether the electrodes are incorrectly positioned or are positioned in a non-standard configuration. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification