WO2024072102A1 - 레이더 기반 비접촉식 부정맥 감지 방법 및 장치 - Google Patents
레이더 기반 비접촉식 부정맥 감지 방법 및 장치 Download PDFInfo
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- WO2024072102A1 WO2024072102A1 PCT/KR2023/015043 KR2023015043W WO2024072102A1 WO 2024072102 A1 WO2024072102 A1 WO 2024072102A1 KR 2023015043 W KR2023015043 W KR 2023015043W WO 2024072102 A1 WO2024072102 A1 WO 2024072102A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
- A61B5/024—Measuring pulse rate or heart rate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
- A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb occurring during breathing
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- the disclosed embodiments relate to non-contact arrhythmia detection technology based on ultra-wideband radar.
- Arrhythmia is a serious disease that is considered a major cause of sudden cardiac death and stroke, and prompt testing is required. Arrhythmias are diagnosed relying on electrocardiogram (ECG) and ultrasound.
- ECG electrocardiogram
- electrocardiograms use electrodes attached to the patient, which limits the patient's movement and can cause contact infectious diseases.
- Ultrasound is an expensive device and must be handled by skilled medical staff.
- UWB ultra-wideband
- the disclosed embodiments are intended to provide a radar-based non-contact arrhythmia detection method and device.
- An arrhythmia detection device includes one or more processors; and an arrhythmia detection device including a memory storing one or more programs executed by the one or more processors, wherein the one or more processors: acquire raw data of an ultra-wideband radar signal of a certain period reflected from the subject, and Generate a first trajectory matrix based on time series data converted from data, generate a second trajectory matrix by decomposing the first trajectory matrix, extract a cardiac signal by converting the second trajectory matrix, and extract the cardiac signal. If the specific wavelength interval is greater than a preset value, the subject is classified as an arrhythmia patient.
- the one or more processors may: identify a chest wall location of the subject based on a maximum dynamic variation included in the raw data.
- the one or more processors arrange the time series data as components of the first trajectory matrix based on the following [Equation 1] so that the components of the remaining diagonals perpendicular to the main diagonal of the first trajectory matrix are all the same.
- a first trajectory matrix can be generated.
- the one or more processors may: calculate the covariance matrix of the first trajectory matrix based on [Equation 2] below.
- the one or more processors Based on a plurality of first decomposition matrices corresponding to the covariance matrix, which are calculated by performing Singular Value Decomposition (SVD) on the covariance matrix of the first trajectory matrix, 1
- the trajectory matrix can be decomposed into a plurality of second decomposition matrices.
- the one or more processors may: calculate the plurality of second decomposition matrices using the S matrix, U matrix, and V T matrix included in the plurality of first decomposition matrices based on [Equation 3] below.
- the one or more processors select a preset number of some matrices from among the plurality of second decomposition matrices in order of size of the heart signal, and configure the frequency band so that the heart signal corresponding to the partial matrix satisfies a preset frequency band. Matrices other than the band may be filtered, and the second trajectory matrix may be generated based on the remaining matrices among the partial matrices after filtering.
- the one or more processors may: reconstruct the heart signal extracted from the second trajectory matrix based on the following [Equation 4].
- the one or more processors may classify the subject as an arrhythmia patient if the R peak interval in the heart signal is greater than or equal to a preset value.
- An arrhythmia detection method includes one or more processors; and a memory storing one or more programs executed by the one or more processors, the method comprising: acquiring raw data of an ultra-wideband radar signal of a certain period reflected from a subject; generating a first trajectory matrix based on time series data converted from the raw data; generating a second trajectory matrix by decomposing the first trajectory matrix; converting the second trajectory matrix to extract a heart signal; and classifying the subject as an arrhythmia patient when a specific wavelength interval in the heart signal is greater than or equal to a preset value.
- the method may further include: identifying the subject's chest wall location based on the maximum dynamic variation included in the raw data.
- the step of generating the first trajectory matrix includes dividing the time series data into the first trajectory matrix based on the following [Equation 1] so that the components of the remaining diagonals perpendicular to the main diagonal of the first trajectory matrix are all the same. It may include generating the first trajectory matrix by arranging it as a component.
- Generating the second trajectory matrix may include calculating a covariance matrix of the first trajectory matrix based on Equation 2 below.
- the step of generating the second trajectory matrix includes a plurality of first decomposition matrices corresponding to the covariance matrix, which are calculated by performing singular value decomposition (SVD) on the covariance matrix of the first trajectory matrix. Based on this, it may include decomposing the first trajectory matrix into a plurality of second decomposition matrices.
- first decomposition matrices corresponding to the covariance matrix, which are calculated by performing singular value decomposition (SVD) on the covariance matrix of the first trajectory matrix. Based on this, it may include decomposing the first trajectory matrix into a plurality of second decomposition matrices.
- the step of generating the second trajectory matrix includes dividing the plurality of second decomposition matrices using the S matrix, U matrix, and V T matrix included in the plurality of first decomposition matrices, based on [Equation 3] below. It may include a calculating step.
- Generating the second trajectory matrix may include selecting a preset number of matrices from among the plurality of second decomposition matrices in order of magnitude of the heart signal; filtering matrices other than the frequency band so that the heart signal corresponding to the partial matrix satisfies a preset frequency band; And the second trajectory matrix may be generated based on the remaining matrix after filtering among the partial matrices.
- the step of extracting the heart signal may further include reconstructing the heart signal extracted from the second trajectory matrix based on the following [Equation 4].
- the classifying step may include classifying the subject as an arrhythmia patient if the R peak interval in the heart signal is greater than or equal to a preset value.
- the disclosed embodiments can provide a non-contact arrhythmia detection method by estimating an electrocardiogram signal from an ultra-wideband radar signal using a trajectory matrix.
- the disclosed embodiments can provide a non-contact arrhythmia detection method that follows a traditional arrhythmia diagnosis method by determining the R peak interval among the estimated heart rate signals.
- FIG. 1 is a block diagram illustrating an arrhythmia detection device according to an embodiment.
- Figure 2 is an exemplary diagram showing the output of an arrhythmia detection device according to an embodiment
- Figure 3 is a graph showing the performance of an arrhythmia detection device according to an embodiment
- FIG. 4 is a flowchart illustrating an arrhythmia detection method according to an embodiment.
- Figure 1 is a block diagram for explaining an arrhythmia detection device 100 according to an embodiment.
- the arrhythmia detection device 100 includes a processor 110 and a memory 120.
- the processor 110 acquires raw data of ultra-wideband radar signals of a certain period reflected from the subject.
- ultra-wideband radar is a next-generation sensor that perceives the surrounding environment by transmitting an impulse signal from a transmitting antenna and receiving a signal from the receiving antenna that reflects the transmitted impulse signal back to the subject.
- the processor 110 can acquire raw data of the ultra-wideband radar signal in impulse units transmitted by the ultra-wideband radar and reflected to the subject.
- the raw data may consist of a frame signal including signal strength.
- Processor 110 may identify the subject's chest wall location based on the maximum dynamic variation detected in the raw data.
- the processor 110 may generate a first trajectory matrix based on time series data converted from raw data.
- the time series data may be data converted from raw data related to the chest wall position.
- the processor 110 may extract a heart signal by filtering noise unrelated to the heart signal (e.g., the subject's breathing, noise caused by the external environment) from the raw data.
- the processor 110 may generate a first trajectory matrix by arranging time series data converted from raw data as elements of a matrix.
- the processor 110 may generate a first trajectory matrix by arranging the time series data converted to raw data so that the components of the remaining diagonals perpendicular to the main diagonal of the matrix are all the same.
- the processor 110 may arrange the time series data based on Equation 1 below so that the components of the remaining diagonals perpendicular to the main diagonal of the first trajectory matrix are all the same.
- H is the first trajectory matrix
- x a is the a-th time series data
- L is the length of the time series data
- n and m may be arbitrary natural numbers.
- n L-m+1 and 2 ⁇ m ⁇ n.
- the value of m is preferably [L/2].
- the processor 110 generates a second trajectory matrix based on the first trajectory matrix.
- the processor 110 may generate a second trajectory matrix based on the covariance matrix of the first trajectory matrix.
- the processor 110 may calculate the covariance matrix of the first trajectory matrix based on Equation 2 below.
- C may refer to the covariance matrix, H to the first trajectory matrix, H T to the transpose of the first trajectory matrix, and n to the number of time series data.
- the processor 110 may generate a second trajectory matrix by performing singular value decomposition (SVD) on the covariance matrix of the first trajectory matrix.
- SVD singular value decomposition
- the processor 110 may generate a second trajectory matrix based on a plurality of first decomposition matrices calculated by performing singular value decomposition on the covariance matrix of the first trajectory matrix.
- the processor 110 may calculate at least one of the S matrix, U matrix, V T matrix, and V matrix as the plurality of first decomposition matrices.
- the S matrix is the eigenvalue of the covariance matrix ( , , , ) is a diagonal matrix arranged as the main diagonal component. At this time, unique values can be organized in descending order.
- the U matrix is a left singular matrix, and each column vector can contain orthogonal vectors that capture patterns and correlations in the raw data.
- the U matrix may include a normalized orthogonal eigenvector corresponding to the S matrix.
- the V T matrix is the transpose of a right singular matrix and may include a right singular vector, which is an orthogonal vector that describes the relationship of raw data.
- the processor 110 may calculate a plurality of second decomposition matrices that, when added, become the first decomposition matrix as a decomposition matrix of the first trajectory matrix based on the plurality of first decomposition matrices corresponding to the covariance matrix.
- the processor 110 may decompose the first locus matrix into a plurality of second decomposition matrices using a plurality of first decomposition matrices.
- the processor 110 may decompose the first trajectory matrix into a plurality of second decomposition matrices based on Equation 3 below.
- i-th second decomposition matrix among the plurality of second decomposition matrices is the ith eigenvalue of the covariance matrix, is the ith column vector of the U matrix, may mean the i-th row vector of the V matrix.
- the processor 110 generates a second trajectory matrix based on the first trajectory matrix.
- the processor 110 may generate a second trajectory matrix as a decomposition matrix of the first trajectory matrix, that is, based on a plurality of second decomposition matrices.
- the processor 110 may generate a second trajectory matrix based on some matrices selected from among the plurality of second decomposition matrices.
- the processor 110 may select a preset number of matrices from among the plurality of second decomposition matrices, for example, in order of the size of the heart signal.
- the processor 110 may filter some matrices so that the heart signal corresponding to some matrices satisfies a preset frequency band.
- the frequency band may include a range from 0.7 Hz to 3 Hz, which is the common heartbeat frequency.
- the processor 110 can improve the precision of the extracted heart signal by removing noise and outliers other than the heart frequency.
- the processor 110 may generate a second trajectory matrix based on the remaining matrix after filtering among some matrices.
- the processor 110 may generate a second trajectory matrix by adding up all remaining matrices.
- Processor 110 extracts the heart signal based on the second trajectory matrix.
- the processor 110 may extract a heart signal in the frequency domain by applying Fast Fourier Transformation to the second trajectory matrix.
- the processor 110 may reconstruct the extracted heart signal based on [Equation 4] below.
- k may be the number of heart signals
- m and n may be the number of rows or columns of the first trajectory matrix
- the processor 110 may classify the subject as an arrhythmia patient when a specific wavelength interval in the heart signal is greater than or equal to a preset value.
- the processor 110 may classify the subject as an arrhythmia patient.
- the processor 110 may classify the subject as an arrhythmia patient when the R peak interval or the standard deviation of the R peak interval in the heart signal is greater than or equal to a preset value.
- Memory 120 stores one or more instructions that processor 110 executes.
- Memory 120 may store various data used by processor 110.
- memory 120 may include input data or output data for software (e.g., a program executed by processor 110 and/or instructions associated with the program).
- Figure 2 is an exemplary diagram showing the output of the arrhythmia detection device 100 according to an embodiment.
- the top shows the logarithm of the eigenvalues of the covariance matrix
- the bottom shows the heart signal corresponding to the top.
- the processor 110 may perform singular value decomposition on the covariance matrix to calculate eigenvalues of the corresponding raw data. At this time, for scaling, the processor 110 can show the distribution of eigenvalues by taking logarithms of eigenvalues.
- the processor 110 may extract a heart signal based on the second trajectory matrix.
- the processor 110 can identify heart signal characteristics by decomposing the frequency component using wavelets.
- FIG. 3 is a graph showing the performance of the arrhythmia detection device 100 according to one embodiment.
- the error between the arrhythmia detection device 100 according to one embodiment and the existing method of detecting arrhythmia using an electrocardiogram signal is compared.
- the arrhythmia detection device 100 shows a coincidence rate of about 90% when compared to a conventional method of detecting arrhythmia using an electrocardiogram signal.
- the arrhythmia detection device 100 is less than 0.5 based on IBI (Inter-Beat Interval) when compared to a method of detecting arrhythmia using a conventional electrocardiogram signal. It indicates that there is a correlation.
- IBI Inter-Beat Interval
- the arrhythmia detection device 100 can classify patients into normal people and arrhythmia patients based on characteristic values for IBI, similar to a method of detecting arrhythmia using existing electrocardiogram signals.
- normal subjects classified according to the arrhythmia detection device 100 have an IBI standard value of 200 ms or less, and arrhythmia patients have an IBI standard value of more than 200 ms.
- the arrhythmia detection device 100 may classify the subject as an arrhythmia patient based on whether the standard deviation of a specific wavelength interval exceeds a specific threshold (eg, 200 ms).
- a specific threshold eg, 200 ms
- Figure 4 is a flowchart for explaining an arrhythmia detection method according to an embodiment.
- the method of FIG. 4 may be performed by the arrhythmia detection device 100 according to the embodiment of FIG. 1.
- the arrhythmia detection device 100 acquires (410) raw data of ultra-wideband radar signals of a certain period reflected from the subject.
- the arrhythmia detection device 100 generates a first trajectory matrix based on time series data converted from raw data (420).
- the arrhythmia detection device 100 generates a second trajectory matrix based on the first trajectory matrix (430).
- the arrhythmia detection device 100 extracts a heart signal based on the second trajectory matrix (440).
- the arrhythmia detection device 100 determines whether a specific wavelength interval in the heart signal is greater than or equal to a preset value (450).
- the arrhythmia detection device 100 classifies the subject as an arrhythmia patient when the specific wavelength interval in the heart signal is greater than a preset value (451).
- the arrhythmia detection device 100 classifies the subject as an arrhythmia patient when the specific wavelength interval in the heart signal is less than a preset value (452).
- the method is divided into a plurality of steps, but at least some of the steps are performed in a different order, combined with other steps, omitted, divided into detailed steps, or not shown. One or more steps may be added and performed.
- Embodiments of the present invention may include a program for performing the methods described in this specification on a computer, and a computer-readable recording medium containing the program.
- the computer-readable recording medium may include program instructions, local data files, local data structures, etc., singly or in combination.
- the media may be those specifically designed and constructed for the present invention, or may be those commonly available in the computer software field.
- Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs, DVDs, and media specifically configured to store and perform program instructions such as ROM, RAM, flash memory, etc. Includes hardware devices.
- Examples of the program may include not only machine language code such as that generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
- a unit, etc. refers to a computer-related entity such as hardware, a combination of hardware and software, or software.
- a radar-based non-contact arrhythmia detection method and device can be used in the digital medical industry by estimating an electrocardiogram signal from an ultra-wideband radar signal using a trajectory matrix.
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Claims (18)
- 하나 이상의 프로세서; 및상기 하나 이상의 프로세서에 의해 실행되는 하나 이상의 프로그램을 저장하는 메모리를 구비하는 부정맥 감지 장치로서,상기 하나 이상의 프로세서는:피검자로부터 반사되는 일정 주기의 초광대역 레이더 신호의 원시 데이터를 획득하고,상기 원시 데이터에서 변환되는 시계열 데이터에 기초하여 제1 궤적 행렬을 생성하고,상기 제1 궤적 행렬을 분해하여 제2 궤적 행렬을 생성하고,상기 제2 궤적 행렬을 변환하여 심장 신호를 추출하고,상기 심장 신호에서 특정 파장 간격이 기 설정된 값 이상인 경우, 상기 피검자를 부정맥 환자로 분류하는, 부정맥 감지 장치.
- 제1항에 있어서,상기 하나 이상의 프로세서는:상기 원시 데이터에 포함되는 최대 동적 변동에 기초하여 상기 피검자의 흉벽 위치를 식별하는, 부정맥 감지 장치.
- 제1항에 있어서,상기 하나 이상의 프로세서는:상기 제1 궤적 행렬의 공분산 행렬에 특이값 분해(Singular Value Decomposition; SVD)를 수행하면 산출되는, 상기 공분산 행렬에 대응하는 복수의 제1 분해 행렬들에 기초하여, 상기 제1 궤적 행렬을 복수의 제2 분해 행렬들로 분해하는, 부정맥 감지 장치.
- 제5항에 있어서,상기 하나 이상의 프로세서는:상기 복수의 제2 분해 행렬들 중 일부 행렬을 심장 신호의 크기 순으로 기 설정된 개수만큼 선택하고,상기 일부 행렬에 대응하는 심장 신호가 기 설정된 주파수 대역을 만족하도록, 상기 주파수 대역 이외의 행렬을 필터링하고,상기 일부 행렬 중 필터링하고 남은 나머지 행렬에 기초하여 상기 제2 궤적 행렬을 생성하는, 부정맥 감지 장치.
- 제1항에 있어서,상기 하나 이상의 프로세서는:상기 심장 신호에서 R 피크 간격이 기 설정된 값 이상이면, 상기 피검자를 부정맥 환자로 분류하는, 부정맥 감지 장치.
- 하나 이상의 프로세서; 및상기 하나 이상의 프로세서에 의해 실행되는 하나 이상의 프로그램을 저장하는 메모리를 구비하는 부정맥 감지 장치에 의해 수행되는 방법으로서,피검자로부터 반사되는 일정 주기의 초광대역 레이더 신호의 원시 데이터를 획득하는 단계;상기 원시 데이터에서 변환되는 시계열 데이터에 기초하여 제1 궤적 행렬을 생성하는 단계;상기 제1 궤적 행렬을 분해하여 제2 궤적 행렬을 생성하는 단계;상기 제2 궤적 행렬을 변환하여 심장 신호를 추출하는 단계; 및상기 심장 신호에서 특정 파장 간격이 기 설정된 값 이상인 경우, 상기 피검자를 부정맥 환자로 분류하는 단계를 포함하는, 부정맥 감지 방법.
- 제10항에 있어서,상기 방법은:상기 원시 데이터에 포함되는 최대 동적 변동에 기초하여 상기 피검자의 흉벽 위치를 식별하는 단계를 더 포함하는, 부정맥 감지 방법.
- 제10항에 있어서,상기 제2 궤적 행렬을 생성하는 단계는,상기 제1 궤적 행렬의 공분산 행렬에 특이값 분해(Singular Value Decomposition; SVD)를 수행하면 산출되는, 상기 공분산 행렬에 대응하는 복수의 제1 분해 행렬들에 기초하여, 상기 제1 궤적 행렬을 복수의 제2 분해 행렬들로 분해하는 단계를 포함하는, 부정맥 감지 방법.
- 제14항에 있어서,상기 제2 궤적 행렬을 생성하는 단계는,상기 복수의 제2 분해 행렬들 중 일부 행렬을 심장 신호의 크기 순으로 기 설정된 개수만큼 선택하는 단계;상기 일부 행렬에 대응하는 심장 신호가 기 설정된 주파수 대역을 만족하도록, 상기 주파수 대역 이외의 행렬을 필터링하는 단계; 및상기 일부 행렬 중 필터링하고 남은 나머지 행렬에 기초하여 상기 제2 궤적 행렬을 생성하는 단계를 포함하는, 부정맥 감지 방법.
- 제10항에 있어서,상기 분류하는 단계는,상기 심장 신호에서 R 피크 간격이 기 설정된 값 이상이면, 상기 피검자를 부정맥 환자로 분류하는 단계를 포함하는, 부정맥 감지 방법.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130045613A (ko) * | 2011-10-26 | 2013-05-06 | 한국표준과학연구원 | 비침습적 심근 전기활동 매핑 방법 |
| US20150112220A1 (en) * | 2013-10-23 | 2015-04-23 | King Abdullah University Of Science And Technology | Apparatus and method for wireless monitoring using ultra-wideband frequencies |
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| US20190282178A1 (en) * | 2018-03-16 | 2019-09-19 | Zoll Medical Corporation | Monitoring physiological status based on bio-vibrational and radio frequency data analysis |
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2023
- 2023-09-27 AU AU2023352636A patent/AU2023352636A1/en active Pending
- 2023-09-27 WO PCT/KR2023/015043 patent/WO2024072102A1/ko not_active Ceased
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| US20150112220A1 (en) * | 2013-10-23 | 2015-04-23 | King Abdullah University Of Science And Technology | Apparatus and method for wireless monitoring using ultra-wideband frequencies |
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| US20190282178A1 (en) * | 2018-03-16 | 2019-09-19 | Zoll Medical Corporation | Monitoring physiological status based on bio-vibrational and radio frequency data analysis |
| KR20210066332A (ko) * | 2019-11-28 | 2021-06-07 | 재단법인대구경북과학기술원 | 타겟의 생체 정보 결정 방법 및 장치 |
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