Color ultrasonic Doppler blood flow speed estimation arc tangent optimization algorithm

A technology of blood flow velocity and color ultrasound, which is applied in the field of ultrasonic detection, can solve the problems of difficult implementation of FPGA, slow convergence, large volume, etc., and achieve the effect of high precision, small error, and meeting calculation needs

Inactive Publication Date: 2011-02-16
INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of too large volume, Basoglu et al. proposed a method of creating two LUTs (look-up table, look-up table), one of which includes the range of rapid changes of the arctangent function. This LUT has good quantification and is suitable for small The sensitivity to changes is better. Another LUT is aimed at the slow-changing range of the arctangent function. This non-linear LUT has a larger quantization step size, which effectively reduces the LUT volume, but this reduction is still not enough; Taylor's formula expansion method When the ind...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Color ultrasonic Doppler blood flow speed estimation arc tangent optimization algorithm
  • Color ultrasonic Doppler blood flow speed estimation arc tangent optimization algorithm
  • Color ultrasonic Doppler blood flow speed estimation arc tangent optimization algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In the LUT table lookup method, we consider that the arctangent function is an odd function in the range of -∏ / 2~∏ / 2, so we only need to make the LUT table of the first quadrant, and find The values ​​of other quadrants can be converted by addition and subtraction.

[0022] by the trigonometric formula We can know that when ∏ / 4≤V thereby 0≤Y<1. So: when 1≤c<∞,

[0023] V = π 4 + arctan ( C - 1 C + 1 ) - - - ( 2 )

[0024] In this way, we only need to make a LUT table with 0≤c Then check the LUT table to find final output

[0025] Similarly, within the value range of the arctangent function of the mean velocity of blood flow -∏~∏, the arctangent operation ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of ultrasonic inspection. The invention aims at providing a color ultrasonic Doppler blood flow speed estimation method which has less resource consumption and is accurate and reliable. The color ultrasonic Doppler blood flow speed estimation arc tangent optimization algorithm is characterized by comprising the following steps of: making an LUT (look-up table) table in an LUT method; looking up the LUT table as 0<=c<1; firstly calculating and then looking up the LUT table and finally outputting as 1<=c< infinity; and in a similar way, transforming arc tangent operation in a value range of -pi to pi of a blood flow mean velocity arc tangent function, wherein V is average blood flow speed; A is an imaginary part of a self correlation function; and B is a real part of the self correlation function. The invention is mainly applied to ultrasonic inspection blood flow speed estimation.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic testing and ultrasonic testing instruments, in particular to an arctangent optimization algorithm for color ultrasonic Doppler blood flow velocity estimation. Background technique [0002] Blood flow velocity and its direction are the most basic and important parameters in color Doppler imaging of the blood flow system. In the color ultrasound Doppler system, the stray signals in the received signal (such as echoes reflected by muscle tissue and blood vessel wall) have serious interference to the blood flow signal that you want to use, so in order to improve the quality of color blood flow imaging, the It performs filtering suppression. The complex signal Zi(n)=Ii(n)+Qi(n) is synthesized from the Ii and Qi quadrature signals output by filtering, the autocorrelation function of the complex signal is calculated, and then the average blood flow velocity is calculated by the autocorrelation functi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): A61B8/06
Inventor 周盛王晓春王延群王立伟杨军宋学东李穗
Owner INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap