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 at present, and increasing the transmission driving voltage of an ultrasonic wave transmitting probe; otherwise, determining that the fetus is in a non-fetal movement period, and reducing the transmission driving voltage of the ultrasonic wave transmitting probe. 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 relatively stable acquisition quality and less influence on a pregnant women and the fetus.

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...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a fetal movement control system with relatively stable collection quality and less impact on pregnant women and fetuses in view of the defects of the prior art that the above-mentioned collection quality is unstable and may bring adverse effects to pregnant women or fetuses. Method and device for improving fetal heart rate Doppler signal acquisition quality

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