Ultrasonic echo signal direction information extraction method and fetal heart rate calculation method
A technology of ultrasonic echo and direction information, applied in the field of signal processing, can solve the problem of low extraction accuracy, and achieve the effect of improving the accuracy and ensuring the accuracy.
Pending Publication Date: 2022-02-22
EDAN INSTR
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[0004] In view of this, an embodiment of the present invention provides a method for extracting direction information of ultrasonic echo signals and a method for calculating fetal heart rate, so as to solve the problem of low accuracy of direction information extraction of ultrasonic echo signals
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[0090] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0091] According to an embodiment of the present invention, an embodiment of a method for extracting direction information of an ultrasonic echo signal is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be implemented in a computer system such as a set of computer-executable instructions and, although ...
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The invention relates to the technical field of signal processing, in particular to an ultrasonic echo signal direction information extraction method and a fetal heart rate calculation method. The direction information extraction method comprises the following steps: obtaining an in-phase signal and a phase shift signal corresponding to an ultrasonic echo signal; wherein the phase shift signal is obtained by carrying out any phase demodulation on the ultrasonic echo signal; and determining direction information of the ultrasonic echo signal based on the waveform area corresponding to the in-phase signal and the phase shift signal. Since the waveforms corresponding to the in-phase signals and the phase shift signals can be frequency-domain waveforms, time-domain waveforms or other types of waveforms, the influence of amplitude-phase imbalance phenomenon between the demodulated signals on the direction information extraction accuracy can be reduced by using the waveform area to identify the direction information, and the direction information extraction accuracy is improved. and the accuracy of extracting the direction information of the ultrasonic echo signal is improved.
Description
technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for extracting direction information of ultrasonic echo signals and a method for calculating fetal heart rate. Background technique [0002] Ultrasonic Doppler technology is the most common way of fetal heart electronic monitoring. The basic principle of this way is: using a transducer to convert the frequency The ultrasonic wave is transmitted to the abdomen of the pregnant woman, and the ultrasonic wave will reflect when it encounters the interface. If the interface moves relative to the sound source, the frequency of the reflected sound wave and the frequency of the incident sound wave will change: when the moving target is far away from the ultrasonic source, the frequency of the ultrasonic echo signal decreases; When the moving target is close to the ultrasonic source, the frequency of the ultrasonic echo signal increases. Wherein, the ultrasonic Doppler...
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IPC IPC(8): A61B8/02
CPCA61B8/02A61B8/488A61B8/5215A61B2503/02
Inventor 刘锦群
Owner EDAN INSTR