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Method for extracting fetal electrocardiograms (FECG) by separation

An extraction method and electrocardiogram technology, applied in the field of separation and extraction of fetal electrocardiogram, can solve problems such as inability to extract, large distortion of fetal electrocardiogram waveform, etc.

Inactive Publication Date: 2009-10-14
NANJING UNIV
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Problems solved by technology

[0043] The existing fetal ECG first-level or second-level separation and extraction methods for single-channel signal separation and extraction, such as matched filter method, singular value decomposition (SVD), nonlinear extraction method, etc., the extracted fetal ECG waveform is distorted Larger, in many cases it cannot be extracted at all

Method used

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  • Method for extracting fetal electrocardiograms (FECG) by separation
  • Method for extracting fetal electrocardiograms (FECG) by separation
  • Method for extracting fetal electrocardiograms (FECG) by separation

Examples

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Embodiment Construction

[0072]Example of the first stage separation and extraction method in the scheme.

[0073] (1) Read a maternal-fetal mixed ECG signal picked up from the maternal abdominal surface. Data from MIT's fetal ECG database [29] , the name of the data is Data848, the data has 4 channels (4 channels) of maternal-fetal mixed ECG signals from abdominal conduction, the data of the first channel is read, the data length is 36500 samples, and the sampling rate is 1000Hz. attached Figure 7 Figure (a) in (a) is the wave form (part) of the single guide data.

[0074] (2) Signal preprocessing, eliminating baseline drift, 50Hz (or 60Hz) power frequency interference and high frequency noise in the mixed ECG signal. In this example, a 0-phase FIR band-pass filter is selected to remove baseline drift and high-frequency noise interference, the band-pass frequency range is 0.5-100Hz, and the filter order is 1001; through the accurate estimation of the amplitude, frequency and phase parameters of t...

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Abstract

A method for extracting fetal electrocardiograms (FECG) by separation comprises the following major steps: 1, separating maternal electrocardiogram component from mixed maternal-fetal electrocardiogram signals to acquire the preliminary estimation of fetal electrocardiogram signals, herein referred to as the primary separating extraction; and 2, further separating disturbance and noise from the preliminary estimation of the fetal electrocardiogram signals acquired from the primary separating extraction to acquire the final estimation of the fetal electrocardiogram signals, herein referred to as the secondary separating extraction. The invention relates to a method for the primary separating extraction of FECG and a method for the secondary separating extraction of FECG respectively. The two methods comprise basically the same steps as follows: signal pre-processing; R-wave crest detection; re-sampling; time-domain averaging; recovery re-sampling and the like. Both the methods are methods of extraction by separating one-channel signals. The separating extractability of the two methods is higher than that of other existing methods of extraction by separating one-channel signals.

Description

technical field [0001] This patent application relates to a method for separating and extracting fetal electrocardiogram (FECG). [0002] The so-called fetal electrocardiogram refers to the complete waveform of the fetal electrocardiogram signal after the interference noise has been eliminated. With the fetal electrocardiogram, not only the fetal heart rate can be known, but also parameters such as its ST segment and PQRS time limit can be known, and some pathological conditions of the fetus can be found in time according to them: intrauterine hypoxia, fetal arrhythmia, fetal heart rate Abnormalities, premature beats, fetal distress, S-T segment changes, widened PQRS time limit, congenital heart disease, etc. [0003] The fetal heart monitoring equipment used to obtain the fetal electrocardiogram mainly includes an electrocardiographic amplifier module, an analog-to-digital conversion (A / D) and storage module, and a data processing module. The ECG amplifier module and the an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0444A61B5/344
Inventor 刘红星郑威肇莹蒋鑫宁新宝
Owner NANJING UNIV
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