Device and procedure for visual three-dimensional presentation of ECG data
First Claim
1. A method for analyzing cardiac electrical activity comprising:
- obtaining ECG data measured from a plurality of actual lead sites on the surface of a patient'"'"'s body;
computing from the ECG data measured at the plurality of actual lead sites, a time variable heart vector that represents size and orientation of a time varying electrical dipole that approximates electrical heart activity and that has an origin near the center of the patient'"'"'s heart; and
normalizing the time variable heart vector by a normalization factor without changing the direction of the time variable heart vector, wherein the normalization factor is computed from the patient'"'"'s ECG data.
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Abstract
The invention relates to the analysis of ECG data by exploiting computerized three-dimensional spatial presentation of the measured data using the vector concept. A three-dimensional presentation of the human heart may be correlated with waveforms specific for standard ECG or derived ECG signals based on the dipole approximation of the heart electrical activity. The three-dimensional heart model may be rotated, and the ECG signals are interactively linked to the model. In the visualization process, different types of signal presentation may be used, including graphical presentation of the heart vector hodograph, graphical presentation of the signal waveform in an arbitrary chosen point on the heart, and graphical presentation of the map of equipotential lines on the heart in a chosen moment. Additional tools for analyzing ECG data are also provided which may be interactively used with the display tools.
50 Citations
9 Claims
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1. A method for analyzing cardiac electrical activity comprising:
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obtaining ECG data measured from a plurality of actual lead sites on the surface of a patient'"'"'s body; computing from the ECG data measured at the plurality of actual lead sites, a time variable heart vector that represents size and orientation of a time varying electrical dipole that approximates electrical heart activity and that has an origin near the center of the patient'"'"'s heart; and normalizing the time variable heart vector by a normalization factor without changing the direction of the time variable heart vector, wherein the normalization factor is computed from the patient'"'"'s ECG data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for visualizing cardiac electrical activity comprising:
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obtaining ECG data measured from a plurality of actual lead sites on the surface of a patient'"'"'s body; computing from the ECG data measured at the plurality of actual lead sites, a time variable heart vector that represent size and orientation of a time varying electrical dipole that approximates electrical heart activity and that has an origin near the center of the patient'"'"'s heart; normalizing the time variable heart vector by a normalization factor, wherein the normalization factor is computed from the patient'"'"'s ECG data; deriving a cardiac electrical signal from the normalized time variable heart vector; and displaying the cardiac electrical signal using a representation of a three dimensional image of a model heart.
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8. A method of analyzing cardiac electrical activity comprising:
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obtaining ECG data measured at a plurality of actual lead sites on the surface of a patient'"'"'s body; computing from the ECG data measured at the plurality of actual lead sites, a time variable heart vector that represents size and orientation of a time varying electrical dipole that approximates electrical heart activity and that has an origin near the center of the patient'"'"'s heart; computing a normalization factor from the ECG data measured at the plurality of actual lead sites; and producing information concerning a normalized time variable heart vector by scaling the time variable heart vector by the normalization factor.
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9. A method of displaying cardiac electrical activity comprising:
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obtaining ECG data measured at a plurality of actual lead sites on the surface of a patient'"'"'s body; computing from the ECG data measured at the plurality of actual lead sites, a time variable heart vector that represents size and orientation of a time varying electrical dipole that approximates electrical heart activity and that has an origin near the center of the patient'"'"'s heart; computing a normalization factor from the ECG data measured at the plurality of actual lead sites; computing a normalized time variable heart vector by scaling the time variable heart vector by the normalization factor; producing a three dimensional heart representation on a display screen having the same origin as the time variable heart vector; indicating on the display screen a designated position on the heart representation; and producing information concerning electrical potential corresponding to the designated position by scalar multiplication of the normalized time variable heart vector and a lead vector that corresponds to the selected position.
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Specification