# US 11,998,341 B2 · Apparatus, method, and computer-readable recording medium for measuring size of electrocardiography signal using electrocardiography signal using Hilbert transform

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- Number: US 11,998,341 B2
- Document ID: US11998341B2
- Status: Granted
- Kind: B2
- Application number: 17/438,154
- Filed: 2019-03-11
- Published: 2022-05-12
- Granted: 2024-06-04
- Earliest claimed: 2019-03-11
- Applicants: Man-Rim Choi
- Inventors: Man-Rim Choi
- Web page: https://patentgrep.com/patent/US11998341B2

## CPC

- A61B 5/349: Detecting specific parameters of the electrocardiograph cycle
- A61B 5/318: Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B 5/352: Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
- A61B 5/353: Detecting P-waves
- A61B 5/355: Detecting T-waves
- A61B 5/7253: {characterised by using transforms}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An apparatus for measuring the size of an electrocardiography signal using a Hilbert transform, according to one embodiment of the present invention, may comprise: a receiving unit for receiving a measured electrocardiography signal; a transform unit for Hilbert-transforming the received electrocardiography signal; and a measurement unit for obtaining the size of the electrocardiography signal on the basis of the Hilbert-transformed electrocardiography signal.

## Claims

### Claim 1

An apparatus for measuring a size of an electrocardiography signal using a Hilbert transform, the apparatus comprising:
a receiving unit for receiving a measured electrocardiography signal;
a transform unit for Hilbert-transforming the received electrocardiography signal; and
a measurement unit for obtaining the size of the electrocardiography signal based on the Hilbert-transformed electrocardiography signal,
wherein the measurement unit includes:
a first module for creating a Nyquist diagram, which is a time response curve in which a value of the electrocardiography signal is a real value and a value of the Hilbert-transformed electrocardiography signal is an imaginary value;
a second module for fitting the created Nyquist diagram by using circle fitting; and
a third module for obtaining a diameter of a circle formed on the fitted Nyquist diagram as the size of the electrocardiography signal.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the diameter of the circle formed on the fitted Nyquist diagram is proportional to sizes of a P wave, an R wave, and a T wave of the electrocardiography signal.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the size of the P or T wave is a height from a baseline of the electrocardiography signal to a peak of the P or T wave, and
the size of the R wave is a height from a peak having a lower value between peaks of Q and S waves to a peak of the R wave.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the third module is configured to:
obtain a diameter of a first circle corresponding to a first curve shape formed at an earliest time among curve shapes included in the Nyquist diagram as a size of a P wave of the electrocardiography signal;
obtain a diameter of a second circle corresponding to a second curve shape formed at a later time than the first curve shape as a size of an R wave of the electrocardiography signal; and
obtain a diameter of a third circle corresponding to a third curve shape formed at a later time than the second curve shape as a size of a T wave of the electrocardiography signal.

### Claim 5

A method for measuring a size of an electrocardiography signal using a Hilbert transform, the method comprising:
a first step of receiving, by a receiving unit, a measured electrocardiography signal;
a second step of Hilbert-transforming, by a transform unit, the received electrocardiography signal; and
a third step of obtaining, by a measurement unit, the size of the electrocardiography signal based on the Hilbert-transformed electrocardiography signal,
wherein the measurement unit includes:
a first module for creating a Nyquist diagram, which is a time response curve in which a value of the electrocardiography signal is a real value and a value of the Hilbert-transformed electrocardiography signal is an imaginary value;
a second module for fitting the created Nyquist diagram by using circle fitting; and
a third module for obtaining a diameter of a circle formed on the fitted Nyquist diagram as the size of the electrocardiography signal.

### Claim 6

A computer-readable recording medium recorded with a program to execute a method for measuring a size of an electrocardiography signal using a Hilbert transform, the method comprising:
a first step of receiving, by a receiving unit, a measured electrocardiography signal;
a second step of Hilbert-transforming, by a transform unit, the received electrocardiography signal; and
a third step of obtaining, by a measurement unit, the size of the electrocardiography signal based on the Hilbert-transformed electrocardiography signal,
wherein the measurement unit includes:
a first module for creating a Nyquist diagram, which is a time response curve in which a value of the electrocardiography signal is a real value and a value of the Hilbert-transformed electrocardiography signal is an imaginary value;
a second module for fitting the created Nyquist diagram by using circle fitting; and
a third module for obtaining a diameter of a circle formed on the fitted Nyquist diagram as the size of the electrocardiography signal.