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

Compensation method for magnetic resonance gradient eddy current

A gradient, one-way technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc., can solve problems such as affecting image quality and diagnostic accuracy, difficulty in eddy current field suppression, and image artifacts.

Active Publication Date: 2015-05-13
EAST CHINA NORMAL UNIV +1
View PDF15 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, suppression of the short-term components of the eddy field becomes more difficult when the two techniques are combined
During fast imaging scanning, especially in the case of sharp switching of the gradient magnetic field, the influence of the short-term component of the eddy current field cannot be ignored, otherwise artifacts will appear in the obtained image, affecting image quality and diagnostic accuracy

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
  • Compensation method for magnetic resonance gradient eddy current
  • Compensation method for magnetic resonance gradient eddy current
  • Compensation method for magnetic resonance gradient eddy current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] refer to image 3 with Figure 4 , the present invention adds multiple reverse overshoot modules to the conventional gradient waveform generator, so that the time parameters and amplitude parameters of each reverse overshoot module can be independently adjusted. In the signal chain, the front stage of the reverse overshoot module is a digital-to-analog converter, and the subsequent stage is a signal conditioning module. The reverse overshoot module is realized by a differential circuit, a voltage divider circuit and a reverse follower. Wherein, the potentiometer or variable capacitor is used in the differential circuit to realize the adjustable time parameter of the reverse overshoot module, and the potentiometer is used in the voltage dividing circuit to realize the adjustable amplitude parameter of the reverse overshoot module. The reverse overshoot module can also be implemented in the logic control unit of the gradient waveform generator. By modifying the value of...

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 discloses a compensation method for magnetic resonance gradient eddy current, the method is as follows: a plurality of reverse overswing modules with independent adjustable time parameter and range parameter are formed on the common gradient waveform generator; and a switching switch is added in each gradient channel for switching the each gradient channel at the main coil mode, shielding coil mode and common mode; then, adjusting the parameter for each gradient channel under the main coil mode and the shielding coil mode; finally, recovering all gradient channels to the common mode, adopting the algorithm optimization for optimizing pre-emphasis parameter and reverse overswing parameter; the method can improve the inhibitory effect of short time component of eddy current field while combining the pre-emphasis technology and self-shielding technology and keep the inhibitory effect of long time component of eddy current field.

Description

technical field [0001] The invention relates to magnetic resonance imaging technology, in particular to a gradient eddy current compensation method. Background technique [0002] Magnetic resonance imaging has become a very useful tool in medical diagnosis. The magnetic resonance imaging instrument mainly includes the following parts: magnet subsystem, gradient subsystem, radio frequency subsystem, spectrometer subsystem and main computer. Among them, the magnet subsystem is used to generate a static magnetic field; the gradient subsystem is used to generate a three-dimensional spatially positioned gradient magnetic field; the radio frequency subsystem is used to generate excitation signals and collect magnetic resonance signals; the spectrometer subsystem is mainly used to control the gradient subsystem and The radio frequency subsystem makes them work together in the imaging process; the main computer is mainly used to realize the functions of imaging scheme selection, im...

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): G01R33/385G01R33/387
Inventor 宁瑞鹏胡坤李钰刘擘杨光谢海滨
Owner EAST CHINA NORMAL UNIV
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