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Method and device for repelling aliasing of doppler bloodstream aural signal

A Doppler signal and sound signal technology, which is applied in the field of anti-aliasing processing of Doppler blood flow sound signals, can solve the problems of output signal frequency distortion, calculation amount and required storage space increase, and achieve high real-time The effect of simplicity, simplification of link and calculation amount, and low cost

Active Publication Date: 2008-04-16
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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Problems solved by technology

[0008] The disadvantage of the above-mentioned prior art is that although a good anti-aliasing effect can be obtained, since the zero-insertion operation is adopted for the input signal, the calculation amount and the required storage space of each link in the sound signal processing are both costly. multiply
The disadvantage of this method is that, since the frequency of the output signal is equal to the input signal, the output signal after frequency modulation may have frequency distortion.

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  • Method and device for repelling aliasing of doppler bloodstream aural signal
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  • Method and device for repelling aliasing of doppler bloodstream aural signal

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[0032] Below, the present invention is further described in conjunction with the preferred embodiments shown in the accompanying drawings.

[0033] Such as Figure 5 As shown, an anti-aliasing method similar to that disclosed in U.S. Patent No. 5,553,621 is to firstly perform zero-interpolation and up-sampling processing on the input quadrature Doppler signal, and the obtained signal spectrum is as follows Figure 6 shown; then the I(t) sequence after the upsampling process is divided into two paths and respectively used FIR (finite impulse response) filter H For_I and H Rev_I For filtering, the Q(t) sequence is divided into two channels, respectively using the FIR filter H For_Q and H Rev_Q Filtering; The results after the four-way filtering process are divided into two groups (H For_I and H For_Q The output is a group, H Rev_I and H Rev_Q The outputs are accumulated as a group) to obtain forward and reverse unidirectional blood flow signals R(t) and F(t). where filte...

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Abstract

A Doppler blood flow sound signal anti-aliasing method and device are used for ultrasonic diagnose system, to process anti-aliasing treatment to orthogonal Doppler signal x (t)=I (t)+iQ (t) obtained by processed radio-frequency ultrasonic echo signal. The method comprises steps: setting four FIR filter units HFor_IE, HFor_IO, HRev_IE, and HRev_IO, and receiving the I (t) signals to process filter treatment separately; setting four FIR filter units HFor_QE, HFor_QO, HRev_QE, and HRev_QO, and receiving the Q (t) signals to process filter treatment separately; processing combination treatment and accumulation treatment to the filter treatment eight circuit signals in order, to obtain forward / reverse blood flow sound outputting signals F (t) and R (t). Using the present invention, it can greatly predigest anti-aliasing treatment tache and account amount, leading the system to have lower cost and high real-time advantage.

Description

technical field [0001] The invention relates to ultrasound technology, in particular to signal processing in medical ultrasound scanning, in particular to an anti-aliasing processing method and device for Doppler blood flow sound signals. Background technique [0002] Spectral Doppler technology is widely used in the non-destructive detection and measurement of blood flow velocity in blood vessels. After the radio frequency electrical signal is converted into an acoustic signal by the ultrasonic transmitting transducer, it enters the human body. Ultrasonic signals will be scattered when encountering human cells (tissue cells or blood cells), and part of the scattered signals will reach the receiving transducer and be converted into electrical signals by the transducer. The received weak signal is subjected to low-noise amplification, quadrature demodulation, and low-pass filtering to obtain two audio quadrature Doppler signals. Since tissue and blood vessel wall echoes hav...

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Application Information

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IPC IPC(8): A61B8/06G06Q50/00
CPCG01F1/663A61B8/06
Inventor 张羽
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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