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Vector measurement method of Doppler blood flow velocity by utilizing apparent displacement

A blood flow velocity vector and measurement method technology, which is applied in the field of medical ultrasound applications, can solve problems such as the impact of measurement accuracy, and achieve the effects of improving measurement accuracy, improving anti-interference, and simple calculation

Inactive Publication Date: 2010-09-15
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This scheme uses an approximate first-order polynomial to process this curve, which greatly affects the measurement accuracy

Method used

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  • Vector measurement method of Doppler blood flow velocity by utilizing apparent displacement
  • Vector measurement method of Doppler blood flow velocity by utilizing apparent displacement
  • Vector measurement method of Doppler blood flow velocity by utilizing apparent displacement

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Embodiment Construction

[0019] The specific embodiments of the present invention will be briefly described below in conjunction with the accompanying drawings. First, some units in the ultrasonic sensor array [2] are driven by the pulse excitation unit [1] to emit ultrasonic signals, and the ultrasonic signals emitted by each array element are reflected by the moving object [3] after being focused at the measurement position and then reflected by the sensor [2] Some units receive and send signals to the receiving and amplifying unit [4] for amplification, and the amplified signals are sent to the receiving signal preprocessing unit [5] for quadrature demodulation processing, digital-to-analog conversion and synthesis of complex signals, and then processed by correlators to obtain Relative to the phase difference of the received signals transmitted twice adjacently, then the phase difference sending unit [6] establishes the apparent velocity linear equations, and the equations are solved by the least s...

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Abstract

The invention relates to a vector measurement method of Doppler blood flow velocity by utilizing apparent displacement. The invention measures the components of the velocity vector of a moving target by utilizing apparent displacement, thereby realizing vector measurement of the Doppler blood flow velocity. For each receiving array element, the linear relationship expression between the velocity components and the receiving signal phase is established according to the apparent displacement; and when signals received by all the receiving array elements are taken into consideration, the linear relationship constitutes an overdetermined linear equation in multiple unknowns, and the equation is solved by a least square method, thereby obtaining a high-precision measurement result.

Description

Technical field: [0001] The invention belongs to the application field of medical ultrasound and uses the concept of apparent displacement and parameters to realize the blood flow velocity vector measurement in human blood vessels by pulse wave Doppler. Background technique: [0002] In 1842, the Austrian scientist Doppler discovered an important physical phenomenon. When the vibrating wave source gradually approaches the observer, the measured frequency is higher than the frequency emitted from the wave source. When the source of the wave moves away, the measured frequency is lower than the emitted frequency. Later, people called the discovery of Doppler the Doppler effect. [0003] When the pulse wave is used as the signal source, the motion speed of the object under test can be investigated by checking the phase difference between two adjacent received signals. This method is called the pulse wave Doppler method. Among the various existing ultrasonic blood flow imaging ...

Claims

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Application Information

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IPC IPC(8): A61B8/06
Inventor 彭虎于盎宁
Owner UNIV OF SCI & TECH OF CHINA
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