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Method for obtaining a diffusion-weighted image

一种扩散加权、图像的技术，应用在图像增强、图像数据处理、传感器等方向

Inactive Publication Date: 2007-05-16
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such diffusion-weighted imaging sequences streaking artifacts can appear in MRI images under certain conditions

Method used

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  • Method for obtaining a diffusion-weighted image
  • Method for obtaining a diffusion-weighted image
  • Method for obtaining a diffusion-weighted image

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[0026] FIG. 1 shows an example of a pulse sequence of a dual spin-echo planar sequence without switching on the diffusion gradient according to the prior art. In such a double spin echo imaging sequence, a 90° radio-frequency pulse 11 is first irradiated into the examination subject (not shown), followed by two 180° pulses 12 , 13 . Simultaneously with the 90° pulse, the magnetic field gradient GS (gradient 14 ) for slice selection is switched on. The additional diffusion gradients 15 - 18 are switched in the direction of the fault after the fault-selective gradient has been activated in the fault direction.

[0027] In addition, the phase encoding gradient G is switched on in the phase encoding direction P . This gradient 19 corresponds to the phase encoding gradient of an echo planar imaging sequence. Also switch on a readout gradient G in the signal readout direction A (gradients 20 and 21). In this case, the signal is read during switching on of the gradient 21 . Swi...

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Abstract

A diffusion-weighted data record is captured, in which magnetic diffusion gradients are switched. A diffusion-weighted image is calculated for an object under examination with the help of the diffusion-weighted data record. De-phasing gradients are switched so as to reduce artifacts on the basis of additional signal echoes in the diffusion-weighted image. An independent claim is also included for a magnetic resonance facility for generating a diffusion-weighted image with the help of a magnetic nuclear resonance.

Description

technical field [0001] The invention relates to a method for obtaining a diffusion-weighted image of an examination object in a magnetic resonance system and to a magnetic resonance system using the method. In particular, the invention relates to a method for recording diffusion-weighted images by means of a dual spin echo imaging sequence. Background technique [0002] An imaging method that can visualize the diffusion of water molecules in the human body has been established in magnetic resonance tomography. Magnetic resonance tomography provides valuable insights by means of diffusion imaging, especially when determining pathophysiological processes, for example in the human brain. In particular, stroke areas within the brain can be located. [0003] Diffusion is due to thermal translational motion of molecules. This motion is a random process, also known as Brownian molecular motion. Diffusion-weighted magnetic resonance tomography is based on very short distances tr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/44G06T5/00
CPCG01R33/56341G01R33/56518
Inventor 迈克尔·兹旺格
Owner SIEMENS AG
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