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A magnetic resonance imaging method

A magnetic resonance imaging technology with the opposite direction, applied in the measurement of magnetic variables, medical science, diagnosis, etc., can solve problems such as image distortion and blur, and achieve the effect of reducing artifacts, reducing jump points, and reducing image artifacts

Active Publication Date: 2019-11-19
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

In the above process, due to T2 relaxation, the macroscopic transverse magnetization vector will gradually decay with time, and the FSE data line collects echo signals at different time points (different TEs), and the amplitude of the echo signals will gradually decrease. This has a difference The echo signal filled in the K space will cause image distortion, such as blur
In addition, if the data of a certain TR is corrupted by motion, it will introduce obvious motion artifacts in the image

Method used

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Embodiment approach 1

[0043] Preferred embodiment 1: use several FSE sequences to excite the target scanning part, and obtain two sets of data lines with opposite filling directions, wherein one set of data lines fills the filling unit containing the center of K space, and the filling method can be selected as Figure 7a or Figure 7b For any one shown (one acquisition is completed), another group of data lines fills the area of ​​the filling unit that does not include the center of K-space that connects to the filling unit that includes the center of K-space. In this filling method, all echo chains in the central area of ​​K are collected continuously in time to ensure that the central area of ​​K space is collected in the shortest time, and artifacts caused by movement during data acquisition are avoided as far as possible, ensuring The contrast of the image generated in the later stage; moreover, the filling direction is opposite at the junction of the two filling units to avoid jump points. It...

Embodiment approach 3

[0045] Preferred embodiment 3, if the Effective TE is not the first echo or the last echo, then the above two groups of echo chains overlap in the connecting part, so as to ensure that the echo data corresponding to the Effective TE is filled in the K-space center point. Please refer to the attached Figure 9 , Effective TE is set on the echo 2 of the data line, and the echo 2 data of the two sets of data lines are filled in the center position of the K space, and a group of echoes is on the side of the center of the K space along the reference coding direction from echo 5 to the echo Wave 2 is filled in reverse order (signal strength from low to high), while another set of echoes is filled sequentially from echo 2 to echo 5 along the reference coding direction on the other side of K space (signal intensity is from high to low), and The echo 1 of one group of echoes of the two groups of data lines overlaps with the echo 3 of the other group (the corresponding phase codes are t...

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Abstract

The invention discloses a magnetic resonance imaging method. The magnetic resonance imaging method comprises the following steps: dividing a K space into filling units comprising a K space center and filling units not comprising the K space center along a reference coding direction; exciting a target scanning position by use of a plurality of FSE sequences, and obtaining corresponding data lines in the reference coding direction; distributing data lines corresponding to the same FSE sequence to the same filling unit, wherein the filling directions of the data lines at connecting positions between the filling units comprising the K space center and the filling unit not comprising the K space center are opposite; and performing image reconstruction on K space data to obtain a magnetic resonance image of a scanned position. According to the magnetic resonance imaging method, the filling directions of the data lines at the connecting positions between the filling units comprising the K space center and the filling unit not comprising the K space center are opposite, jump points in a K space filling process are reduced, K space center area continuous acquisition is realized, and artifacts generated due to motion are effectively reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of magnetic resonance imaging for medical diagnosis, in particular to a magnetic resonance imaging method. 【Background technique】 [0002] Magnetic resonance imaging technology has become a commonly used technique in modern medical diagnosis. A typical magnetic resonance imaging system mainly includes magnets, gradient coils, radio frequency transmitting coils, radio frequency receiving coils, signal processing units and image reconstruction units. The spinning hydrogen atoms in human tissue can be equivalent to a small magnetic needle, and the image of the tissue being imaged can be obtained through the magnetic resonance imaging system. In the gray-scale MRI image, according to the difference of multiple parameters between the lesion tissue and the normal tissue, different sequences can be used to better show the contrast between the lesion tissue and the normal tissue through different gray scales. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/561A61B5/055
Inventor 李国斌王超洪李兆鹏张卫国
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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