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

Method of determining ADC coefficient using steady sequency in diffusion weighted magnetic resonance imaging

A technique of magnetic resonance imaging and diffusion-weighted images, which is used in the directions of using nuclear magnetic resonance imaging systems for measurement, magnetic resonance measurement, and measurement of magnetic variables.

Inactive Publication Date: 2004-05-26
SIEMENS AG
View PDF0 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, it is known that the calculated diffusion coefficient under the condition of applying the ambipolar diffusion gradient is still strongly dependent on each T 2 value, which also causes significant artifacts S.Ding, H.Trillaud et al.J.ofMagnetic Resonance in Medicine 34, 586-595(1995)]

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 of determining ADC coefficient using steady sequency in diffusion weighted magnetic resonance imaging
  • Method of determining ADC coefficient using steady sequency in diffusion weighted magnetic resonance imaging
  • Method of determining ADC coefficient using steady sequency in diffusion weighted magnetic resonance imaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] figure 1 A nuclear spin tomography device is schematically shown for generating gradient pulses according to the present invention. Here, the configuration of the nuclear spin tomography apparatus corresponds to the configuration of the conventional tomography apparatus. The basic magnetic field magnet 1 generates a strong magnetic field that is constant in time, so that, for example, a nuclear spin in an examination area of ​​an object to be examined on a human body is polarized or calibrated. The high uniformity of the basic magnetic field required for nuclear spin resonance measurement is defined, for example, in a spherical measurement space M into which the human body part to be examined is sent. In order to provide support for uniformity requirements and especially to eliminate the influence of time, shims made of ferrite magnetic materials are installed at appropriate positions. The influence of the time change is eliminated by the compensation coil 2 controlled by...

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 magnetic resonance apparatus and method to acquire a diffusion-weighted image in diffusion-weighted MRT imaging, a non-diffusion-weighted data set and a diffusion-weighted data set are measured and stored by means of a DESS sequence (Double Echo Steady State Sequence), with two readout gradients being switched successively for the non-diffusion-weighted data set, and a bipolar diffusion gradient pulse sequence being switched between two readout gradients for the diffusion-weighted data set. A diffusion-weighted MRT image is calculated based on the non-diffusion-weighted data set and the diffusion-weighted data set, as well as on the basis of a value characterizing the diffusion-weighted measurement.

Description

Technical field [0001] The present invention generally relates to nuclear spin tomography (synonym: magnetic resonance tomography, MRT), as it is used in medicine to examine patients. Here, the present invention particularly relates to a method for determining ADC coefficients in diffusion-weighted magnetic resonance imaging. Background technique [0002] MRT is based on the physical phenomenon of nuclear spin resonance and has been successfully applied in medicine and biophysics as a method of generating images for more than 15 years. In this inspection method, the object to be inspected is applied with a strong constant magnetic field. In this way, the nuclear spins of atoms in the object that have no regular directions will be calibrated. High-frequency waves can now excite the "ordered" nuclear spins into specific oscillations. This oscillation produces the actual measurement signal in the MRT, which is received by the appropriate receiving coil. Among them, the measurement o...

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): G01R33/563
CPCG01R33/56341
Inventor 迈克尔·戴姆林
Owner SIEMENS AG
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