Method for determining a heart period from an ECG waveform using image representation of ECG
First Claim
1. A method for estimating a heart period using at least one of a plurality of electrocardiogram recordings, comprising:
- obtaining the plurality of electrocardiogram recordings generated from a plurality of electrocardiogram sources, wherein the plurality of electrocardiogram sources include a paper form electrocardiogram source, a digital form electrocardiogram source, and an echocardiogram from an echocardiogram source;
utilizing a computer processor to convert a plurality of the electrocardiogram recordings into a plurality of corresponding electronic electrocardiogram images, including removing a wandering baseline from the electrocardiogram recordings prior to conversion of the electrocardiogram recordings to the corresponding electrocardiogram images;
deriving an electrocardiogram waveform from one of the corresponding electronic electrocardiogram images by extracting an upper envelope and a lower envelope of the electrocardiogram waveform from one of the corresponding electronic electrocardiogram images using a curve tracing algorithm;
determining an electrocardiogram signal peak from increased thickness at the electrocardiogram signal peak due to pixel dithering;
determining a difference between an upper envelope and a lower envelope at an electrocardiogram signal peak and at an electrocardiogram low point, which are a local maximum and a local minimum of one of the corresponding electronic electrocardiogram images; and
estimating the heart period.
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Abstract
A method for estimating a heart period is disclosed. The heart period is detected from an ECG recording. ECG data is acquired, and converted into electronic ECG images. The data is processed to prepare for estimation of a heart period. The heart period is estimated based upon an average of intervals between a plurality of detected peaks of electronic electrocardiogram waveforms. The peaks are determined by taking a product of a filtered electronic ECG signal with a wandering baseline removed, a difference between the upper and lower ECG envelopes of the electronic ECG images, and a first order derivative of a derived ECG waveform.
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Citations
10 Claims
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1. A method for estimating a heart period using at least one of a plurality of electrocardiogram recordings, comprising:
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obtaining the plurality of electrocardiogram recordings generated from a plurality of electrocardiogram sources, wherein the plurality of electrocardiogram sources include a paper form electrocardiogram source, a digital form electrocardiogram source, and an echocardiogram from an echocardiogram source; utilizing a computer processor to convert a plurality of the electrocardiogram recordings into a plurality of corresponding electronic electrocardiogram images, including removing a wandering baseline from the electrocardiogram recordings prior to conversion of the electrocardiogram recordings to the corresponding electrocardiogram images; deriving an electrocardiogram waveform from one of the corresponding electronic electrocardiogram images by extracting an upper envelope and a lower envelope of the electrocardiogram waveform from one of the corresponding electronic electrocardiogram images using a curve tracing algorithm; determining an electrocardiogram signal peak from increased thickness at the electrocardiogram signal peak due to pixel dithering; determining a difference between an upper envelope and a lower envelope at an electrocardiogram signal peak and at an electrocardiogram low point, which are a local maximum and a local minimum of one of the corresponding electronic electrocardiogram images; and estimating the heart period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification