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Method for determining a heart period from an ECG waveform using image representation of ECG

  • US 8,798,725 B2
  • Filed: 08/22/2012
  • Issued: 08/05/2014
  • Est. Priority Date: 02/26/2010
  • Status: Expired due to Fees
First Claim
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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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