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Instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis

A Doppler tire, time-frequency analysis technology, applied in the measurement of pulse/heart rate and other directions, can solve the problem of inability to describe frequency components and inability to analyze

Active Publication Date: 2013-12-25
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0008] Since the fetal heart sound signal is a non-stationary signal, the conventional Fourier transform method cannot describe the frequency components at any time, making it impossible to conduct a comprehensive analysis

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  • Instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis
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  • Instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis

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Embodiment Construction

[0050] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] Such as figure 1 Shown, the present invention is based on the instantaneous heart rate detection method of the Doppler fetal heart sound of time-frequency analysis, comprises the steps:

[0052] S1. Signal preprocessing mainly performs band-pass filtering to the collected Doppler fetal heart sounds, and the pass-band frequency of the band-pass filter is f L to f H , where the collected Doppler fetal heart sound signal is as follows figure 2 Shown; In the present embodiment, the bandpass band of the bandpass filter is 50-250Hz, namely f L 50Hz, f H 250Hz;

[0053] S2. Time-frequency analysis, carry out time-frequency analysis for the Doppler fetal heart sound preprocessed in step S1, adopt the short-time Fourier transform method to carry out time-frequency analysis in the present invention, the two-dimensional time...

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Abstract

The invention relates to the technical field of medical monitoring, and discloses an instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis. The detection method comprises the following steps: preprocessing the Doppler fetal heart sound through a band-pass filter; performing time-sequence analysis on the preprocessed ultrasonic Doppler fetal heart sound, and acquiring a time-sequence graph of the ultrasonic Doppler fetal heart sound by adopting an STFT (Short Time Fourier Transform) to realize convenient and rapid calculation; acquiring the instant heart rate of the fetal heart sound with a cross-correlation method: selecting a feature frequency band according to the time-frequency graph of Doppler fetal heart sound, selecting a feature template according to prior knowledge of a fetal sound signal, evaluating a cross-correlation function of the feature frequency band and the feature template, drawing a cross-correlation curve, and calculating the instant heart rate of the ultrasonic Doppler fetal heart sound signal by calculating the interval of the crest value of the cross-correlation curve. The method can be applied to calculation of the instant heart rate of a clinically-acquired ultrasonic Doppler fetal heart sound signal, and has the advantages of easiness, high calculation speed and high accuracy.

Description

technical field [0001] The present invention relates to the technical field of medical monitoring, more specifically, to a method and device for detecting instantaneous heart rate of Doppler fetal heart sounds based on time-frequency analysis. Background technique [0002] Fetal heart rate monitoring is a commonly used fetal monitoring method to evaluate intrauterine safety by monitoring changes in fetal heart rate. Monitoring the fetus in the mother during the perinatal period can greatly reduce the distress caused by hypoxia and ischemia, reduce the occurrence of fetal birth defects, and even fetal death while knowing the fetal development status. Birth defects have become a serious problem affecting the population quality of our country. Therefore, it is of great significance to pay close attention to the changes of fetal heart rate to improve the quality of birth. As early as the early 19th century, obstetricians used fetal heart auscultation to estimate the status of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/02
Inventor 谢胜利蔡坤冯爱玲于宣福王赛红尧永贤
Owner GUANGDONG UNIV OF TECH
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