An improved fast susceptibility weighted imaging scanning sequence method and imaging method

A magnetically sensitive and sequential technology, applied in sensors, medical science, diagnosis, etc., can solve the problems of long echo time, magnetic resonance scan time, inability to meet clinical needs, and increased number of reconstructed images

Active Publication Date: 2021-09-10
ALLTECH MEDICAL SYST
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Problems solved by technology

Long echo times lead to longer MRI scan times, which not only reduce patient comfort, but also greatly increase the probability of motion artifacts in reconstructed images
[0008] Compared with the traditional 3D GRE, the currently used 3D Dual Echo Steady State free precession sequence (3D Dual Echo Steady State, 3D DESS) has improved the scanning speed and signal-to-noise ratio, but its echo signal susceptibility weight is relatively low. Low, still unable to meet clinical needs

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  • An improved fast susceptibility weighted imaging scanning sequence method and imaging method
  • An improved fast susceptibility weighted imaging scanning sequence method and imaging method
  • An improved fast susceptibility weighted imaging scanning sequence method and imaging method

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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] figure 1 is the existing 3D double-echo steady-state free precession sequence diagram, where θ is the excitation pulse flip angle, SE (Slice Encoding) is the slice encoding direction, PE (Phase Encoding) is the phase encoding direction, RO (Read Out) is Read out the gradient direction, TR (Repetition Time) is the repetition time, TE (Echo Time) is the echo time, FISP (FastImaging with Steady state Precession) is the fast steady state echo, PSIF (mirrored FastImaging with Steady state Precession) is the fast The image of the steady-state echo, Phase is the phase change caused by the magnetic resonance main magnetic field (including the static field change caused by susceptibility), A is the readout pre-dispersion gradient in the RO direction, B is the readou...

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Abstract

The invention discloses a fast susceptibility weighted imaging scanning sequence improvement method and imaging method, which belong to the technical field of magnetic resonance imaging. In the RO direction of the 3D double-echo steady-state free precession sequence, the readout of the pre-dispersion phase gradient is increased. area, so that the PSIF echo is located in front of the FISP echo, so that the above two echoes have a strong susceptibility weight. The K-space data of PSIF and FISP echoes were acquired by the improved sequence, and the complex images of the two echoes were reconstructed respectively, and then the two complex images were synthesized and processed to obtain susceptibility weighted images. Wherein, the phase of the synthesized image is the phase difference of the two complex images. The technical solution provided by the present invention improves the existing 3D double-echo steady-state free precession sequence, which can greatly shorten the magnetic resonance scanning time under the premise of ensuring the imaging quality, thereby improving the patient's comfort and reducing the time spent in reconstructed images. Probability of occurrence of motion artifacts.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to an improved fast susceptibility weighted imaging scanning sequence method and an imaging method. Background technique [0002] Magnetic resonance imaging is a technique that uses the nuclear magnetic resonance phenomenon of hydrogen protons for imaging. Nuclei containing a single number of protons in the human body, such as the ubiquitous hydrogen nucleus, have spin motions for the protons. The spin motion of charged atomic nuclei is physically similar to individual small magnets, and the directionality distribution of these small magnets is random in the absence of external conditions. When the human body is placed in an external magnetic field, these small magnets will be rearranged according to the magnetic force lines of the external magnetic field, specifically in two directions parallel to or antiparallel to the external magnetic field magnetic force lin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055
CPCA61B5/055A61B5/72A61B5/7207
Inventor 罗海朱高杰周翔陈梅泞王超刘霞卞威吴子岳
Owner ALLTECH MEDICAL SYST
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