High-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation

An ultrasonic imaging method and a technique of minimum variance, applied in the analysis of fluids using sound waves/ultrasonic waves/infrasonic waves, the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, etc.

Active Publication Date: 2019-11-26
CHONGQING UNIV +3
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a high-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation, which can significantly improve the imaging resolution and contrast of the algorithm, and simultaneously improve the algorithm efficiency and beamformi...

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
  • High-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation
  • High-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation
  • High-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0073] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0074] figure 1 It is a flowchart of the method of the present invention, figure 2 It is a schematic diagram of forward and backward spatial smoothing algorithm. As shown in the figure, the present invention provides a high-resolution minimum variance ultrasonic imaging method based on time-frequency segmentation, which specifically includes the following steps:

[0075] Step S1: Perform amplification, AD conversion and delay processing on the echo signal received by the ultrasonic array element to obtain ultrasonic echo data; obtain the signal x(τ)=[x 1 (τ),x 2 (τ),...x N (τ)], x 1 (τ)...x N (τ) respectively represent the echo signals received by each array element, N represents the number of ultrasonic array elements, and τ represents the sampling time corresponding to the depth;

[0076] Step S2: According to the maximum concentra...

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 relates to a high-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation and belongs to the acoustic imaging field. The method comprises the following steps of firstly, carrying out delay processing on a sampling signal received by an array element to obtain echo data required by ultrasonic focusing; secondly, selecting a frequency domain segmentation optimal window function according to a maximum concentration measurement criterion of an adaptive window function in STFT; converting an ultrasonic echo signal into a narrow-band sub-signal by using STFT; carrying out conjugate symmetry processing on a first half of narrow-band sub-signal to generate the other half of narrow-band signal by using conjugate symmetry; successively dividing a receiving array into sub-arrays with overlapped array elements, and carrying out forward and backward smoothing and diagonal loading processing on a frequency domain signal to obtain a sample covariancematrix; and finally, processing a frequency domain segmented minimum variance beam forming weight by using inverse fast Fourier transform to obtain a final time domain adaptive beam forming signal. By using the method, an ultrasonic imaging resolution can be remarkably improved, a contrast ratio is increased, and ultrasonic imaging quality can be integrally improved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and relates to a high-resolution minimum variance ultrasonic imaging method based on frequency domain segmentation. Background technique [0002] Ultrasonic imaging is widely used in the field of nondestructive testing and diagnosis due to its advantages of safety, non-invasiveness, real-time and low cost. Beamforming technology is the key technology of ultrasonic imaging, which directly determines the image quality of ultrasonic imaging. DelayAnd Sum (DAS) is the most widely used and simplest beamforming technique in ultrasound imaging. It calculates the delay amount of the received echo signal according to the geometric position relationship of the array element channel, and then aligns and superimposes the delayed data. The traditional DAS algorithm has low complexity, good robustness, and fast imaging speed, but because it uses a fixed window function weighting to increase the wid...

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): G01N29/04G01N29/02G01N29/06G01N29/44G06F17/15
CPCG01N29/02G01N29/04G01N29/0654G01N29/4454G01N2291/044G06F17/15
Inventor 王平杜婷婷王林泓孔露李锡涛柳学功孔美娅田训梁家祺王慧悦
Owner CHONGQING UNIV
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