Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and system for correcting image distortion and magnetic resonance imaging device

An image distortion correction and image technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems that cannot be completely eliminated, and achieve the effect of correcting image distortion and simplifying the calculation process

Active Publication Date: 2013-10-30
SIEMENS SHENZHEN MAGNETIC RESONANCE
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By using these methods, the influence of the eddy current field can be effectively reduced, but it cannot be completely eliminated

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
  • Method and system for correcting image distortion and magnetic resonance imaging device
  • Method and system for correcting image distortion and magnetic resonance imaging device
  • Method and system for correcting image distortion and magnetic resonance imaging device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0142] The imaging parameters of DW-EPI images are: 1.5T magnetic resonance imager, TE / TR=127 / 500msec; bandwidth: 1000Hz; field of view (FoV): 200×200mm; imaging matrix: 128×128; slice thickness: 1; Number of averages: 4; b-values ​​used for diffusion imaging: 0, 500, 1000, respectively; diffusion mode: orthogonal; diffusion method: unipolar.

[0143] The imaging specific parameters of the labeled image are mostly the same as those of the DW-EPI image, except that the average number of times is 1.

[0144] Figure 9a to Figure 9g Schematic illustration of distortion correction for images with b=1000 is shown. Figure 9a Graph is the image with b=0; Figure 9b to Figure 9d are the images in three different diffusion directions with b=1000, where, Figure 9b is the image in the phase encoding direction, Figure 9c is the image in the readout direction, Figure 9d is the image in the direction of the selected layer. Figure 9e to Figure 9g are right Figure 9b to Figure 9d...

example 2

[0149] The specific imaging parameters of DW-EPI images are: 3T magnetic resonance imager, TE / TR=108 / 5900msec; bandwidth: 1040Hz; field of view (FoV): 235×235mm; imaging matrix: 192×192; slice thickness: 25; Number of times: 4; b values ​​used for diffusion imaging were: 0, 1000; diffusion mode: orthogonal; diffusion method: monopolar.

[0150] The imaging specific parameters of the marked image are mostly the same as those of the DW-EPI image, except that the average number of times is 1.

[0151] Figure 12a to Figure 12g Results of distortion correction for images with b=1000 are shown. Figure 12a Graph is the image with b=0; Figure 12b to Figure 12d are the images in three different diffusion directions with b=1000, where, Figure 12b is the image in the phase encoding direction, Figure 12c is the image in the readout direction, Figure 12d is the image in the direction of the selected layer. Figure 12e to Figure 12g are right Figure 12b to Figure 12d The corre...

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

In a method for an apparatus correcting image distortion in diffusion-weighted echo-planar magnetic resonance imaging, a marker sequence is applied before a diffusion-weighted echo planar imaging sequence, to form a combined sequence. The combined sequence is used to obtain marked images with different preset b values and different preset diffusion directions. The diffusion-weighted echo planar imaging sequence is used to obtain diffusion-weighted echo planar images with the same b values and diffusion directions as the marked images. A stretching coefficient and a displacement coefficient are calculated for each image data column of the diffusion-weighted echo planar image. The stretching coefficient and displacement coefficient are used to correct the diffusion-weighted echo planar images.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging (MRI), in particular to a diffusion weighted echo planar imaging (DW-EPI) image distortion correction method and system, and a magnetic resonance imaging device. Background technique [0002] Diffusion imaging is a very clinically valuable functional magnetic resonance imaging technique, which can detect the biological characteristics of water molecule diffusion in human tissues, thereby detecting many lesions that cannot be found by conventional medical imaging methods. Diffusion imaging is usually implemented using echo planar imaging (EPI), which is very fast but susceptible to various artifacts, especially image distortion. [0003] Diffusion weighted imaging (DWI) is a relatively important imaging method of diffusion imaging, which is usually realized by using DW-EPI sequence, and DW-EPI sequence realizes diffusion weighting by adding diffusion gradient to EPI sequence. Th...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/565
CPCG01R33/56518G01R33/56572G01R33/56341
Inventor 周堃
Owner SIEMENS SHENZHEN MAGNETIC RESONANCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com