Single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method

A technology of blood flow velocity and measurement method, which is applied in the direction of blood flow measurement device, ultrasonic/acoustic/infrasonic diagnosis, acoustic wave diagnosis, etc. It can solve the problems affecting Doppler signal extraction and reduce the measurement accuracy of blood flow velocity, etc. Improve, improve accuracy, reduce the effect of requirements

Active Publication Date: 2015-07-08
HEFEI UNIV OF TECH
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Problems solved by technology

In order to realize quadrature demodulation, dual-channel or two-way analog multipliers with identical circuit performance are required, and two sine wave signals with the same amplitude and phase at 90 degrees are the carrier frequency of the signal, otherwise it will seriously affect multiple The extraction of the Puller signal reduces the measurement accuracy of blood flow velocity

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  • Single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method
  • Single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method
  • Single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method

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Embodiment Construction

[0024] The ultrasonic Doppler blood flow velocity measurement method demodulated by the single-channel multiplier of the present invention is as follows: the center frequency generated by the signal generator 1 is f c The sine wave drives the ultrasonic transmitting probe 2 to transmit the ultrasonic signal to the moving object 3, and is reflected by the moving object 3 to obtain a Doppler frequency shift with frequency f c +f d The echo signal, where f d Be the Doppler frequency shift; The echo signal is received by the ultrasonic receiving probe 4, and then enters the single-channel multiplier 5 as an input of the multiplier; the center frequency generated by the signal generator 1 is f c The sine wave enters the frequency synthesizer 6 and produces a frequency of f c1 The sine wave enters the single-channel multiplier 5 as another input of the single-channel multiplier 5, where f c -f c1 ≥f d , and f c >f c1 ;

[0025] The output signal of the single-channel multipl...

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Abstract

The invention discloses a single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method. An existing Doppler blood flow measurement system often uses an orthogonal demodulation scheme which uses a double-channel multiplier as a core to demodulate Doppler signals in ultrasonic echo signals, and the measurement circuit is complex. According to the single-channel multiplier demodulation ultrasonic Doppler blood flow velocity measurement method, a simple single-channel multiplier can extract the frequency spectra of Doppler blood flow signals through selecting proper sine wave demodulation signals and frequency shaft coordinate conversion; the scheme has low demand on the circuit, the complexity of the circuit can be effectively lowered, the data measurement speed is improved, and the measurement precision is high.

Description

technical field [0001] The invention belongs to the application field of medical ultrasound and uses a single-channel multiplier and a frequency difference concept to realize Doppler blood flow velocity measurement in human blood vessels. Background technique [0002] When the sound wave source is moving, the measured frequency has a certain change compared with the actual frequency emitted by the wave source. The direction and speed of the wave source determine the magnitude of the frequency shift. This phenomenon is called the Doppler effect. The Doppler effect can be used to measure the speed of moving objects, and ultrasonic Doppler blood flow measurement is to use the Doppler effect to measure the movement speed of red blood cells in blood vessels. [0003] Existing Doppler blood flow measurement systems mostly use quadrature demodulation to obtain the Doppler signal related to the velocity in the ultrasonic echo signal, and then extract the motion information of the bl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/06
CPCA61B8/06A61B8/5207G06F17/14
Inventor 彭虎于成龙韩志会郑驰超张世宏高志荣
Owner HEFEI UNIV OF TECH
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