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

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...

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