Dynamic demodulation device of Doppler ultrasonic imaging system

A Doppler ultrasound and imaging system technology, applied in the field of Doppler ultrasound imaging system dynamic demodulation devices, can solve the problems of large Doppler frequency shift signal error, inability to compensate for the attenuation of ultrasound echo signals, etc. Error, effect of compensation attenuation

Inactive Publication Date: 2010-04-07
SHENZHEN LANDWIND IND
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a dynamic demodulation device for Doppler ultrasonic imaging system, which overcomes the inability of the prior art to compensate for the attenuation of ultrasonic echo signals in human tissue during orthogonal demodulation, resulting in Doppler The defect of excessive frequency shift signal error

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  • Dynamic demodulation device of Doppler ultrasonic imaging system
  • Dynamic demodulation device of Doppler ultrasonic imaging system
  • Dynamic demodulation device of Doppler ultrasonic imaging system

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[0039] Such as figure 2 As shown, the digital beamforming part is to add the echo signals after AD conversion of multiple (for example, 32) receiving channels after different delays and weights to form a beam, thereby improving the signal-to-noise ratio of the system. The essence of digital TGC is a multiplier, which multiplies the echo signal after beamforming with different coefficients to compensate for the attenuation of ultrasonic signals by human tissues at different depths. Usually these coefficients are preset, and different coefficients are selected according to the depth of the echo. The deeper the depth, the larger the coefficient value, so as to compensate for the exponential attenuation of the echo amplitude. The function of the low-pass filter is to filter out the multiplied sum frequency signal, and the remaining difference frequency signal is the required Doppler frequency shift signal.

[0040] Such as Figure 4 As shown, the core of dynamic demodulation is...

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Abstract

The invention discloses a dynamic demodulation device of a Doppler ultrasonic imaging system, which comprises a digital beam forming module and an orthogonal demodulation module which are connected. The dynamic demodulation device also comprises a dynamic frequency orthogonal signal generation module, wherein the dynamic frequency orthogonal signal generation module is connected with the orthogonal demodulation module, and is used for generating a cosine local oscillatory signal and a sine local oscillatory signal of which frequencies are changed with a beam propagation time and transmitting the signals to the orthogonal demodulation module. The dynamic demodulation device of the Doppler ultrasonic imaging system in the invention can compensate the attenuation of ultrasonic echo signals in human tissue so as to reduce errors of Doppler frequency shift signals.

Description

technical field [0001] The invention relates to the technical field of ultrasonic imaging equipment, in particular to a dynamic demodulation device for a Doppler ultrasonic imaging system. Background technique [0002] In the Doppler ultrasound imaging system, the probe emits a series of ultrasonic coherent pulse trains, and these ultrasonic pulses will be reflected and attenuated during the propagation in the human body. The probe simultaneously receives the ultrasonic echo emitted by human tissue and blood flow, converts it into an electrical signal and amplifies it, and then performs AD conversion and digital beamforming (beamforming). One channel of the signal after beamforming is used for B-mode imaging to generate a two-dimensional tissue image; the other channel performs Doppler correlation processing to generate a blood flow image. To generate blood flow imaging data, firstly, orthogonal demodulation processing is performed. [0003] Such as figure 1 As shown, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00A61B8/06
Inventor 兰海欧镔进李春彬奚进华
Owner SHENZHEN LANDWIND IND
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