SUPPRESSION OF GLOBAL ACTIVITY DURING MULTI-CHANNEL ELECTROPHYSIOLOGY MAPPING USING A WHITENING FILTER
First Claim
1. A method for reconstructing electrical activity propagation along an electrode array within a cardiac chamber, the method comprising:
- sampling signals from the electrode array;
plotting the signals in multi-dimensional space with each axis corresponding to a channel in the electrode array;
decomposing a covariance matrix of the plotted signals to characterize the spread of a data cloud of the signals in the multi-dimensional space; and
decorrelating the data cloud to suppress excursions along correlated directions (global activation) and enhance excursions along each axis (local activation).
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Abstract
Electrical activity propagation along an electrode array within a cardiac chamber is reconstructed. Signals from the electrode array are sampled, and the signals are plotted in multi-dimensional space with each axis corresponding to a channel in the electrode array. A covariance matrix of the plotted signals is decomposed to characterize the spread of a data cloud of the signals in the multi-dimensional space. The data cloud is then decorrelated, such as through whitening, to suppress excursions along correlated directions (global activation) and enhance excursions along each axis (local activation).
23 Citations
19 Claims
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1. A method for reconstructing electrical activity propagation along an electrode array within a cardiac chamber, the method comprising:
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sampling signals from the electrode array; plotting the signals in multi-dimensional space with each axis corresponding to a channel in the electrode array; decomposing a covariance matrix of the plotted signals to characterize the spread of a data cloud of the signals in the multi-dimensional space; and decorrelating the data cloud to suppress excursions along correlated directions (global activation) and enhance excursions along each axis (local activation). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mapping system for reconstructing electrical activity propagation within a cardiac chamber, comprising:
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an array of mapping electrodes configured to sample signals from a channel of interest; and a processing device associated with the plurality of mapping electrodes, the processing device configured to record the sampled signals and associate one of the plurality of mapping electrodes with each recorded signal, the mapping processor further configured to sample signals from the array of mapping electrodes, plot the signals in multi-dimensional space with each axis corresponding to a channel in the array of mapping, decompose a covariance matrix of the plotted signals to characterize the spread of a data cloud of the signals in the multi-dimensional space, and decorrelate the data cloud to suppress excursions along correlated directions (global activation) and enhance excursions along each axis (local activation). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification