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Ultrasound Doppler Information Adaptive Interference Suppression Method

A Doppler information and interference suppression technology, which is applied in the field of ultrasonic Doppler information adaptive interference suppression, can solve the problems of widening the main beam and reducing the resolution of Doppler signals, so as to reduce the impact and ensure the spectrum resolution , The effect of suppressing the interference of side lobes

Active Publication Date: 2017-10-10
CHISON MEDICAL TECH CO LTD
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Problems solved by technology

This windowing method will result in a broadening of the main beam width, reducing the resolution of the Doppler signal on the velocity axis

Method used

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  • Ultrasound Doppler Information Adaptive Interference Suppression Method
  • Ultrasound Doppler Information Adaptive Interference Suppression Method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with drawings and embodiments.

[0019] Such as figure 1 As shown, the ultrasonic Doppler signal at the receiving end first undergoes the steps of analog-to-digital conversion, matched filtering, data demodulation, sampling gate accumulation and summation, wall filtering processing, and slow sampling buffering, and then enters the present invention for spectral line processing.

[0020] Such as figure 2 As shown, the signal processing method flow chart of the present invention is as follows:

[0021] (1) Input the sampling signal of the ultrasonic sampling gate. In the previous cumulative summation step of the sampling gate, the N fast sampling signals covered by the fast sampling direction of the sampling gate are weighted (truncated) according to the window function of N points, and then summed. Preferably, the window function is a Hamming window. N is the number of fast sampling signals covered...

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Abstract

The invention provides an ultrasonic Doppler information self-adaptive interference suppression method based on double-window weighted nonlinear processing, which is suitable for medical ultrasonic imaging. The steps include: inputting the sampling signal of the ultrasonic sampling gate; dividing the inputted slow-sampling direction signal into several sections of the same size within the size interval of a Fourier transform; applying two different window functions to each inputted signal to add a window; The windowed signal is subjected to Fourier transform and modulo operation; the smaller value of the two modulo operation results at the same frequency point is calculated; the spectrum information of each slow sampling signal is synthesized and output. The method of the invention can effectively reduce side lobe interference signals without changing the spectrum resolution.

Description

technical field [0001] The invention relates to the field of ultrasonic medical imaging, in particular to an adaptive interference suppression method for ultrasonic Doppler information. Background technique [0002] Blood flow velocity imaging based on pulsed Doppler technology is an important diagnostic method in the clinical application of ultrasound. Blood flow velocity information, as one of the important physiological characteristics of human blood vessels, can be quantitatively obtained by the pulsed Doppler ultrasound system without intervention. However, ultrasound systems are susceptible to interference such as speckle noise, which can reduce the detection performance of the system. In addition, it is inevitable to introduce off-axis sidelobe and grating lobe signals in the process of Doppler information processing, which will destroy the contrast of spectral images and the detection ability of low-velocity blood flow signals. The traditional Doppler processing te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B8/06
Inventor 严凯张勇陆坚莫善玨
Owner CHISON MEDICAL TECH CO LTD
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