Detection method for detecting QRS wave

• US 8,447,391 B2
• Filed: 06/03/2009
• Issued: 05/21/2013
• Est. Priority Date: 12/26/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chuang, Chun-Te
• Primary Examiner(s): Lavert, Nicole F
• Application Number:
  US12/477,860
• Publication Number:
  US 20100168594A1
• Time in Patent Office: 1,448 Days
• Field of Search: 600/521, 607/33, 607/54, 607/61, 607/136
• US Class Current: 600/521
• CPC Class Codes: A61B 5/366 Detecting abnormal QRS complex, e.g. widening
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

A detection method for detecting a QRS wave is disclosed. An electrocardiogram (ECG) signal is provided. The ECG signal is enhanced to generate a processed signal. A first crest of the processed signal is determined. Each crest following the first crest is defined as a second crest. The level of each second crest is higher than a first threshold value. The result of defining the second crest is utilized to determine whether the QRS wave has occurred and approached a first crest.

Claims

1. A detection method for detecting a QRS wave, comprising:

providing an electrocardiogram (ECG) signal;

enhancing the ECG signal to generate a processed signal, wherein the step of enhancing the ECG signal to generate the processed signal comprises;

utilizing a filter to filter the ECG signal to generate a filtered ECG signal;

utilizing a mask method to process the filtered ECG signal to generate a masked ECG signal; and

normalizing the masked ECG signal;

defining a first threshold value;

detecting a first crest of the processed signal by using the first threshold value;

defining a time period following the first crest;

detecting each crest following the first crest by using the first threshold value within the time period, wherein each detected crest following the first crest is defined as a second crest when the detected crest following the first crest is higher than the first threshold value; and

determining whether the QRS wave occurs between the first crest and a first trough according to the detecting results of the first crest and the second crests.

2. The detection method as claimed in claim 1, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of the first crest and the second crests comprises:

detecting the number, the amplitudes, or the positions of the second crests within the time period following the first crest; and

determining whether the QRS wave occurs between the first crest and the first trough according to the number, the amplitudes, or the positions of the second crests.

3. The detection method as claimed in claim 1, wherein the step of detecting the first crest of the processed signal by using the first threshold value comprises:

comparing the first threshold value with a crest of the processed signal; and

identifying the crest higher than the first threshold value as the first crest.

4. The detection method as claimed in claim 1, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of the first crest and the second crests comprises:

detecting a number of the second crests within the timing period following the first crest; and

determining that the QRS wave occurs between the first crest and the first trough when the number of the second crests is equal to 0 or 1.

5. The detection method as claimed in claim 1, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of the first crest and the second crests comprises:

detecting a number of the second crests within the timing period following the first crest; and

determining that the QRS wave does not occur between the first crest and the first trough when the number of the second crests is higher than 2 or is equal to 2.

6. The detection method as claimed in claim 1, wherein the filter filtering the ECG signal is a low-pass filter or a band-pass filter.

7. The detection method as claimed in claim 1, wherein the mask method processing the filtered ECG signal is a point enhanced method or a gradient enhanced method.

8. A detection method for detecting a QRS wave, comprising:

providing an electrocardiogram (ECG) signal;

enhancing the ECG signal to generate a processed signal, wherein the step of enhancing the ECG signal to generate the processed signal comprises;

utilizing a filter to filter the ECG signal to generate a filtered ECG signal;

utilizing a mask method to process the filtered ECG signal to generate a marked ECG signal; and

normalizing the masked ECG signal;

defining a first threshold value;

detecting a first crest of the processed signal by using the first threshold value;

defining a time period following the first crest;

detecting each crests following the first crest by using the first threshold value within the time period, wherein each detected crest following the first crest is defined as a second crest when the detected crest following the first crest is higher than the first threshold value;

defining a second threshold value;

detecting a first trough of the processed signal by using the second threshold value, wherein the first trough follows the first crest;

detecting each trough following the first trough by using the second threshold value within the time period, wherein each detected trough following the first trough is defined as a second trough when the detected trough following the first trough is lower than the second threshold value; and

determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough.

9. The detection method as claimed in claim 8, wherein the step of detecting the first trough of the processed signal by using the second threshold value comprises:

comparing the second threshold value with a trough of the processed signal; and

identifying the trough lower than the second threshold value as the first trough,

wherein the step of detecting the second trough of the processed signal by using the second threshold value comprises;

comparing the second threshold value with a trough of the processed signal, following the first trough; and

identifying each trough following the first trough and lower than the second threshold value as the second trough.

10. The detection method as claimed in claim 8, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough comprises:

detecting a number, or amplitudes or the positions of the second troughs within the time period following the first trough; and

determining whether the QRS wave occurs between the first crest and the first trough according to the number, or the amplitudes or the positions of the second troughs.

11. The detection method as claimed in claim 8, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough comprises:

detecting a number of the second troughs within the time period following the first trough; and

determining that the QRS wave did not occur between the first crest and the first trough when the number of the second troughs is not equal to 0.

12. The detection method as claimed in claim 8, wherein the step of determining whether the QRS wave occurred between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough comprises:

detecting a number of the second crests and second troughs; and

determining that the QRS wave occurs between the first crest and the first trough when the number of the second crest equals to 1 and the number of the second trough equals to 0.

13. The detection method as claimed in claim 8, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough comprises:

detecting a number of the second crests and second troughs; and

determining that the QRS wave did not occur between the first crest and the first trough when the numbers of the second crests and second troughs are equal to 0.

14. The detection method as claimed in claim 8, further comprising:

comparing the level of the first crest with a third threshold value, wherein the third threshold value is higher than the first threshold value;

detecting a number of the second crests and second troughs; and

determining that the QRS wave occurs between the first crest and the first trough when the level of the first crest is higher than the third threshold value and the numbers of the second crests and second troughs are equal to 0.

15. The detection method as claimed in claim 8, wherein the step of determining whether the QRS wave occurs between the first crest and the first trough according to the detecting results of detecting the first crest, the second crest, the first trough and the second trough comprises:

detecting a number of the second crests and second troughs; and

determining that the QRS wave does not occur between the first crest and the first trough when the number of the second crest is higher than 2 or is equal to 2.

16. The detection method as claimed in claim 8, wherein the filter filtering the ECG signal is a low-pass filter or a band-pass filter.

17. The detection method as claimed in claim 8, wherein the mask method processing the filtered ECG signal is a point enhanced method or a gradient enhanced method.