Extraction of cardiac signal data
First Claim
Patent Images
1. A method for providing a T-wave offset point of an ECG signal, the method comprising:
- identifying the location of a QRS complex in the ECG signal;
using the identified location of the QRS complex, determining a first time window of the ECG signal in which to search for the T-wave offset point; and
in a computer circuit,identifying the T-wave offset point within the first time window, andproviding the identified T-wave offset point as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave of the ECG signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A T-wave offset point of an ECG signal is provided. In accordance with various example embodiments, a location of a QRS complex in the ECG signal is identified and used to determine a first time window of the ECG signal in which to search for a T-wave offset point. The T-wave offset point is identified within the first time window, and the identified T-wave offset point is provided as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave.
53 Citations
29 Claims
-
1. A method for providing a T-wave offset point of an ECG signal, the method comprising:
-
identifying the location of a QRS complex in the ECG signal; using the identified location of the QRS complex, determining a first time window of the ECG signal in which to search for the T-wave offset point; and in a computer circuit, identifying the T-wave offset point within the first time window, and providing the identified T-wave offset point as an output based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave of the ECG signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for providing a repolarization signal for a cardiac cycle of an ECG signal, the method comprising:
-
identifying the location of a QRS complex in the cardiac cycle; using the identified location of the QRS complex, identifying T-wave onset and offset points; using the T-wave onset and offset points to respectively define the start and end of the repolarization signal for the cycle; and in a computer circuit, determining a noise characteristic of the ECG signal in a time window spanning from about the start to about the end of the repolarization signal, and providing the repolarization signal as an output, based upon the determined noise characteristic. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
-
21. A method for providing a time series of beat-to-beat QT interval values from a digitized ECG signal of an ambulatory subject, the method comprising:
-
identifying the location of a QRS complex and a Q-wave onset point of a cardiac cycle of the ECG signal; using the identified location of the QRS complex, determining a first time window of the cardiac cycle in which to search for a T-wave offset point for a T-wave in the cardiac cycle; identifying the T-wave offset point within the first time window; and in a computer circuit, computing a QT interval value using the identified Q-wave onset point of the QRS complex and the identified T-wave offset point, and including the QT interval value in a time series of beat-to-beat QT interval values, based upon a noise characteristic of the ECG signal in a second time window that includes at least a portion of the T-wave. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
-
Specification