Method for removing magnetic resonance head image motion artifacts

A motion artifact and magnetic resonance technology, which is applied in the direction of measurement using nuclear magnetic resonance imaging system, magnetic resonance measurement, and magnetic variable measurement. It can solve the impact of image resolution, slow imaging speed, and image gridding artifacts. The problem is to avoid the meshing process, the method is simple, and the requirements are reduced.

Pending Publication Date: 2020-01-07
EAST CHINA NORMAL UNIV
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Problems solved by technology

Slow imaging speed and susceptibility to artifacts are one of the main challenges facing magnetic resonance imaging at present. During the long-term scanning process, voluntary or involuntary movement of patients will introduce motion artifacts in the final imaging, resulting in image quality degradation. Affect the diagnostic value of the image
The current method for suppressing motion artifacts mainly includes motion detection of the target tissue, and scans only when the target tissue is at a specific position. For example, abdominal scanning will set ECG gating and respiratory gating, but this method will prolong the scanning time. ;Through a special sequence such as BLADE sequence, by repeatedly sampling the center of k-space, estimate the phase with low-frequency data, and perform image reconstruction after phase correction of the data
This method requires k-space interpolation calculation, which will cause image gridding artifacts, and the image resolution will be affected to a certain extent

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  • Method for removing magnetic resonance head image motion artifacts
  • Method for removing magnetic resonance head image motion artifacts
  • Method for removing magnetic resonance head image motion artifacts

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Embodiment

[0023] In this embodiment, the collected magnetic resonance imaging data is two-dimensional brain magnetic resonance imaging data. It is implemented on IDEA, the sequence integration development platform of Siemens, and the magnetic resonance imaging data are collected from Siemens Prisma 3T superconducting magnetic resonance imaging system, using gradient echo sequence. The specific imaging parameters are: repetition time (TR) = 250ms, echo time (TE) = 4.8ms, flip angle (FA) = 70°, field of view (FOV) = 320mm × 320mm (frequency encoding × phase encoding), Layer thickness=5mm, bandwidth (BW)=330HZ / pixel, scanning matrix (matrix)=320×320 (frequency code×phase code).

[0024] Attached below Figure 1-5 The motion artifact image optimization process according to this embodiment will be described in detail.

[0025] refer to figure 1 , figure 1 is a sequence diagram of k-space data filling implemented in this embodiment. The Monte Carlo pseudo-random Cartesian sampling mode i...

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Abstract

The invention discloses a method for removing magnetic resonance head image motion artifacts.. Non-reference image qualitative assessment indexes QITV in the method are used for reflecting image quality. The method comprises the steps of constructing k space data after sampling each time through contraction perception, calculating QITV value of reconstructed images, by observing the change trend of the image QITV value, finding the time when patients make motion in the magnetic resonance screening process, and using k space data without motion to reconstruct contraction perception so as to optimize fully-collected motion artifact images. The image quality of the magnetic resonance motion artifacts can be effectively improved, so that clinical application of magnetic resonance images can bepromoted.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a method for removing motion artifacts in a magnetic resonance head image. Background technique [0002] Magnetic resonance imaging technology is one of the commonly used technologies in medical imaging. It has the advantages of no ionizing radiation, good soft tissue contrast, and imaging at any angle. Slow imaging speed and susceptibility to artifacts are one of the main challenges facing magnetic resonance imaging at present. During the long-term scanning process, voluntary or involuntary movement of patients will introduce motion artifacts in the final imaging, resulting in image quality degradation. Affect the diagnostic value of the image. The current method for suppressing motion artifacts mainly includes motion detection of the target tissue, and scans only when the target tissue is at a specific position. For example, abdominal scanning will set ECG g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/56
CPCG01R33/56A61B5/055
Inventor 王睿杨光宋阳
Owner EAST CHINA NORMAL UNIV
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