Portable module full-depth frequency-shift searching type transcranial doppler detection device and method

A technology of transcranial Doppler and detection device, which is applied in the direction of organ motion/change detection, ultrasound/sonic/infrasound image/data processing, medical science, etc. , to solve the difficulty of blood vessel positioning, save hardware circuit resources, and reduce the amount of calculation.

Pending Publication Date: 2018-08-24
SOUTHEAST UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a portable modulus full-depth frequency shift search type transcranial Doppler detection device and method, and solve the difficulties in vascular positioning and difficult to capture thrombus in traditiona

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  • Portable module full-depth frequency-shift searching type transcranial doppler detection device and method
  • Portable module full-depth frequency-shift searching type transcranial doppler detection device and method
  • Portable module full-depth frequency-shift searching type transcranial doppler detection device and method

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Embodiment Construction

[0034] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0035] like figure 1 , figure 2 Shown is the basic measurement model of the existing TCD: the ultrasound beam passes through the ultrasound window of the skull, enters the brain and reaches the blood vessel. Let the probe transmit frequency be f 0 , the Doppler frequency difference is f D , the reflected echo frequency is f echo , the ultrasonic propagation speed in the human body is c, the blood flow velocity is v, the angle between the incident direction of the ultrasonic beam and the blood flow direction is θ, and the Doppler frequency shift is calculated as:

[0036]

[0037] Since the sound wave propagation velocity in the human body is about 1560m / s, and the blood flow velocity in the blood vessel is usually less than 6m / s; in actual operation, due to the limitation of the ultrasonic window, it can only be measured at a small angle, so cosθ can be ...

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Abstract

The invention discloses a portable module full-depth frequency-shift searching type transcranial doppler detection device and method. The device includes a probe, a probe excitation and echo receivingmodule, a wave filtering and amplifying module, a signal demodulation and orthogonal adjustment module, an AD dual-channel sampling module, a control module and an upper computer. The method includesthe steps that the probe emits a sound wave into the skull and receives a blood flow echo signal; wave filtering and amplification are carried out, actual blood flow frequency-shift signals are obtained after analog demodulation, and orthogonal adjustment is achieved; a data pack is formed, and control over transmission is achieved; preprocessing is conducted on received frequency-shift signals of actual flows, a full-depth frequency-shift searching method is utilized to obtain the blood flow distribution and direction information of the overall depth of an ultrasonic wave beam in the emitting direction, and after dispersed Fourier and pseudo-color conversion, blood flow forms a regional spectrogram according to selected demand depth. By means of the device and method, the blood flow distribution condition of the whole depth of the ultrasonic wave beam in the emitting direction can be displayed, the signal complexity is simplified, and therefore a system is much smaller and more portable.

Description

technical field [0001] The invention relates to a portable modulus full-depth frequency shift search type transcranial Doppler detection device and method, belonging to the technical field of transcranial Doppler ultrasonic detection. Background technique [0002] With the development of the economy and the improvement of the medical level, the speed of population aging is intensifying; the young people have formed an unhealthy lifestyle due to the huge life pressure and work pressure, which has led to a rising incidence of cerebrovascular diseases and a trend of younger people . According to WHO estimates, 1.82 million Chinese residents die of cerebrovascular diseases every year, resulting in a very high social medical burden. [0003] For cerebrovascular diseases, traditional imaging only provides histomorphological references, while transcranial Doppler (TCD) can provide hemodynamic references such as blood flow velocity and pulsatility index. The principle is as figur...

Claims

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Application Information

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IPC IPC(8): A61B8/08
CPCA61B8/0816A61B8/0891A61B8/52
Inventor 赵兴群李已晴夏翎
Owner SOUTHEAST UNIV
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