Device for producing orthogonal local oscillation signal in continuous Doppler ultrasound imaging system

A Doppler ultrasound and imaging system technology, which is applied in the field of quadrature local oscillator signal generating devices for continuous Doppler ultrasound imaging systems, can solve the problems of complex design and high production cost, and achieves the advantages of reducing production cost and design complexity. Effect

Inactive Publication Date: 2009-07-08
SHENZHEN LANDWIND IND
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  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a continuous Doppler ultrasonic imaging system quadrature local oscillator signal generating device, which overcomes the problem that the prior art continuous Doppler imaging system uses a dedicated integrated circuit to generate quadrature local oscillator signals. Complicated and costly to produce defects

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  • Device for producing orthogonal local oscillation signal in continuous Doppler ultrasound imaging system
  • Device for producing orthogonal local oscillation signal in continuous Doppler ultrasound imaging system
  • Device for producing orthogonal local oscillation signal in continuous Doppler ultrasound imaging system

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specific Embodiment

[0033] The quadrature local oscillator signal generating device of the continuous Doppler ultrasonic imaging system of the present invention is used to generate a 2.5 MHz quadrature local oscillator signal for demodulation of ultrasonic echo signals.

[0034] The frequency of the clock (clk) is 40 MHz, the bit width of the phase increment Δθ is N=16, and the bit width of the sine (or cosine) value is M=10. It can be calculated according to the previous formula:

[0035] Δθ=(F LO *2 N ) / F clk =(2.5M*2 16 ) / 40M

[0036] =(4096) 10 =(0001 0000 0000 0000) 2

[0037] Therefore, it is necessary to send Δθ=(0001 0000 0000 0000) to the field programmable gate array FPGA 2 An output frequency of 2.5MHz can be generated.

[0038] In each clock cycle, the phase accumulator generates the current phase value θ by adding the phase of the previous clock and the phase increment Δθ.

[0039] The storage depth in the lookup table T1 is 2 16 , a cosine magnitude value with a width o...

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Abstract

The invention discloses a continuous Doppler US imaging system orthogonal intrinsic signal generation device, which comprise a field programmable gate array (FPGA), a crystal oscillator, a first digital-analog converter and a second digital-analog converter. The output end of the field programmable gate array (FPGA) is connected with the input ends of the first digital-analog converter and the second digital-analog converter; the crystal oscillator is respectively connected with the field programmable gate array (FPGA), the first digital-analog converter and the second digital-analog converter; the crystal oscillator is used for supplying synchronizing clock signals to the field programmable gate array (FPGA), the first digital-analog converter and the second digital-analog converter; the field programmable gate array (FPGA) is used for outputting the sine value corresponding to the phase value to the first digital-analog converter according to the input phase value and outputting the cosine value corresponding to the phase value to the second digital-analog converter; the first digital-analog converter is used for converting the sine value into the corresponding analog signals; the second digital-analog converter is used for converting the cosine value into the corresponding analog signals.

Description

technical field [0001] The invention relates to the technical field of ultrasonic imaging equipment, in particular to a quadrature local oscillator signal generating device for a continuous Doppler (CWDoppler) ultrasonic imaging system. Background technique [0002] The CW mode in the continuous Doppler imaging system usually works like this: a part of the array elements of the probe is used for transmitting, and the other part of the array elements is used for receiving. In this way, the CW can be used for the measurement of the blood flow signal with a relatively fast velocity without aliasing. Commonly used processing methods in CW mode are as follows: figure 1 As shown, the echo signal of each channel is pre-amplified by the pre-low noise amplifier (LNA), and then each receiving channel is subjected to beam synthesis, and then the synthesized signal is subjected to quadrature demodulation (I / Q Demodulate), Finally, an analog-to-digital conversion (ADC) is performed. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/06
Inventor 兰海黄嘉熙蒋颂平
Owner SHENZHEN LANDWIND IND
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