Method and device for improving fetal heart Doppler signal acquisition quality during fetal movement

Abstract

The invention relates to a method for improving fetal heart Doppler signal acquisition quality during fetal movement. The method comprises the following steps: in set time of a fetal heart monitoring process, performing calculation or processing on envelopes of acquired fetal movement Doppler signals, so as to obtain fetal movement characteristic values which represent the fetal movement condition; comparing the obtained fetal movement characteristic values with the size of preset fetal movement thresholds; if the fetal movement characteristic values are greater than or equal to the fetal movement thresholds, determining that a fetus is in a fetal movement period, and increasing the order of a low-frequency suppression filter in a fetal heart Doppler audio-frequency filter circuit; otherwise, determining that the fetus is in a non-fetal movement period, and reducing the order of the filter. The invention also relates to a device for realizing the method. The method and the device for improving the fetal heart Doppler signal acquisition quality during fetal movement have the following beneficial effects of eliminating the interference of the fetal movement signals on fetal heart Doppler signals to a certain extent and being relatively easy in subsequent processing.

Description

technical field [0001] The invention relates to the field of signal processing of medical instruments, and more specifically relates to a method and a device for improving the quality of fetal heart Doppler signal acquisition during fetal movement. Background technique [0002] Ultrasonic Doppler fetal monitor judges the current state of the fetus by transmitting ultrasonic signals and receiving ultrasonic echo signals from the fetal heart. Because the fetal heart is beating continuously, the echo signal will have a certain frequency deviation by using the ultrasonic Doppler principle. The ultrasonic Doppler fetal monitor uses the echo demodulation amplifier circuit to analyze the frequency deviation from the ultrasonic transfer value. Since this value corresponds to the fetal heart rate, the fetal heart rate value can be obtained through further processing by using this frequency offset signal. However, in the process of monitoring the fetal heart rate, it often occurs th...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method to eliminate the interference of fetal movement signals to a certain extent, aiming at the defects of the prior art that are susceptible to the interference of fetal movement Doppler signals caused by fetal movement, making subsequent processing more difficult. , Method and device for improving the quality of fetal heart Doppler signal acquisition during fetal movement, which is relatively easy for follow-up processing

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