System and method for applying a uniform dynamic gain over cardiac data with the aid of a digital computer

• US 10,499,812 B2
• Filed: 08/20/2018
• Issued: 12/10/2019
• Est. Priority Date: 09/25/2013
• Status: Active Grant

• Current Assignee: Bardy Diagnostics, Inc. (Baxter International Inc.)
• Original Assignee: Bardy Diagnostics, Inc. (Baxter International Inc.)
• Inventors: Bardy, Gust H., Felix, Jason, Bishay, Jon Mikalson, Dreisbach, Ezra M.
• Primary Examiner(s): Schaetzle, Kennedy
• Application Number:
  US16/105,603
• Publication Number:
  US 20180353071A1
• Time in Patent Office: 477 Days
• Field of Search: None
• CPC Class Codes: A61B 2560/0456 Apparatus provided with a docking unit
• CPC Class Codes: A61B 2560/0468 Built-in electrodes
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/259 using conductive adhesive means, e.g. gels
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/333 Recording apparatus specially adapted therefor
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor
• CPC Class Codes: A61B 5/35 by template matching
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7232 involving compression of the physiological signal, e.g. to extend the signal recording period

Abstract

A system and method for applying a uniform dynamic gain over cardiac data with the aid of a digital computer is provided. A time series of a plurality of voltage values that comprises a digital representation of a raw electrocardiography (“ECG”) signal recorded by an ambulatory monitor recorder is obtained by an least one computer processor, the time series including segments of noise and segments of non-noise. The segments of non-noise are analyzed by the at least one computer processor and a single gain factor for all of the values in the analyzed non-noise segments is determined by the at least one computer processor based on the analysis. The single gain factor to all of the values in the non-noise segments is applied by the at least one computer processor.

Claims

1. A system for applying a uniform dynamic gain over cardiac data with the aid of a digital computer, comprising:

at least one computer processor configured to execute code comprising;

a value module configured to obtain a time series of a plurality of voltage values that comprises a digital representation of a raw electrocardiography (“

ECG”

) signal recorded by an ambulatory monitor recorder, the time series comprising segments of noise and segments of non-noise;

an identification module configured to identify the noise segments and the non-noise segments;

a definition module configured to define a plurality of temporal windows within the non-noise segments;

an analysis module configured to analyze the segments of non-noise and to determine a single gain factor for all of the values in the analyzed non-noise segments based on the analysis, wherein the analysis comprises analyzing a plurality of the values within each of the temporal windows; and

a gain module configured to apply the single gain factor to all of the values in the non-noise segments.

2. A system according to claim 1, further comprising:

a filter module configured to apply a plurality of noise filters to each of the values;

a marking module configured to mark one or more of the values as the noise based on the application of the filters, wherein each of the noise segments comprises one or more of the values marked as the noise.

3. A system according to claim 1, wherein each of the temporal windows is of a sufficient length to capture at least one heartbeat.

4. A system according to claim 1, further comprising:

a performance module configured to perform a mathematical operation on two of the values within each of the temporal windows;

a statistical module configured to perform a statistical analysis of the results of the mathematical operations for all of the temporal windows,

wherein a result of the statistical analysis is used to determine the single gain factor.

5. A system in accordance with claim 4, wherein the two values comprise a maximum one and a minimum one of the values within each of the temporal windows.

6. A system according to claim 1, further comprising:

placing the values in the non-noise segments within a range preferred for visualization of the non-noise segments.

7. A system according to claim 6, wherein the preferred range is between 2 mV and 10 mV.

8. A system according to claim 1, further comprising:

a bridging module configured to bridge the non-noise segments to create a continuous ECG signal for display.

9. A method for applying a uniform dynamic gain over cardiac data with the aid of a digital computer, comprising:

obtaining by at least one computer processor a time series of a plurality of voltage values that comprises a digital representation of a raw electrocardiography (“

ECG”

) signal recorded by an ambulatory monitor recorder, the time series comprising segments of noise and segments of non-noise;

analyzing by the at least one computer processor the segments of non-noise and determining by the at least one computer processor a single gain factor for all of the values in the analyzed non-noise segments based on the analysis;

applying by the at least one computer processor the single gain factor to all of the values in the non-noise segments; and

bridging by the at least one processor the non-noise segments to create a continuous ECG signal for display.

10. A method according to claim 9, further comprising:

identifying the noise segments and the non-noise segments;

defining a plurality of temporal windows within the non-noise segments,

wherein the analysis comprises analyzing a plurality of the values within each of the temporal windows.

11. A method according to claim 10, further comprising:

applying a plurality of noise filters to each of the values;

marking one or more of the values as the noise based on the application of the filters, wherein each of the noise segments comprises one or more of the values marked as the noise.

12. A method according to claim 10, wherein each of the temporal windows is of a sufficient length to capture at least one heartbeat.

13. A method according to claim 10, further comprising:

performing a mathematical operation on two of the values within each of the temporal windows;

performing a statistical analysis of the results of the mathematical operations for all of the temporal windows; and

using a result of the statistical analysis is used to determine the single gain factor.

14. A method in accordance with claim 13, wherein the two values comprise a maximum one and a minimum one of the values within each of the temporal windows.

15. A method according to claim 9, further comprising:

placing the values in the non-noise segments within a range preferred for visualization of the non-noise segments.

16. A method according to claim 15, wherein the preferred range is between 2 mV and 10 mV.

17. A non-transitory computer readable storage medium storing code for executing on a computer system to perform the method according to claim 9.