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Method and device for reconstructing magnetic resonance k space and magnetic resonance imaging method and device

A k-space and magnetic resonance technology, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement, etc., can solve problems such as distortion of results, reduce data collection, weaken filling errors, and speed up imaging. effect of speed

Active Publication Date: 2014-06-18
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

However, due to the limitations of the acquisition method, if the acceleration factor is large, the calibration process may involve frames that are far apart. In the figure, the acceleration factor is 4, which involves two frames of data separated by two frames. It is assumed that the k-space data is the same between the four frames, so when the data similarity of the far apart frames is not good, the result will be distorted

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  • Method and device for reconstructing magnetic resonance k space and magnetic resonance imaging method and device
  • Method and device for reconstructing magnetic resonance k space and magnetic resonance imaging method and device
  • Method and device for reconstructing magnetic resonance k space and magnetic resonance imaging method and device

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Embodiment 1

[0075] Firstly, perform the magnetic resonance k-space data acquisition work as described in step a. Here, the multi-coil parallel imaging acquisition technology is used to acquire multi-frame k-space data of the imaging area within a continuous period of time (such as a cardiac motion cycle). . Each frame of k-space data is acquired by multiple coils in parallel, and each coil data corresponds to one k-space. Since the parallel imaging acquisition technology is adopted, in each k-space, its k-space data is divided into the data to be collected and the data to be collected. The data to be collected represents the magnetic resonance data obtained by the acquisition, and the data to be collected represents the magnetic resonance data not collected. blank data.

[0076] image 3 It is a schematic diagram of a preferred multi-frame k-space acquisition in the present invention. In the figure, only the first 4 frames of k-space data are shown for illustration, and the k-space dat...

Embodiment 2

[0114]This embodiment is another preferred mode of the present invention. In this embodiment, step b is performed: in the multi-frame data, any frame is used as the frame to be filled, and the data collected in the frame to be filled and other frames collected in a direction different from the frame to be filled are collected. The data to determine the coil combination coefficient of the frame to be filled, the specific implementation process is different from the first embodiment. In the first embodiment, at least two groups of data with different encoding directions are used to calculate the coil combination coefficient. According to the fact that the coil combination coefficients of the k-space data of each frame are the same, the coil combination coefficient of the other frame data is calculated by using one frame of data, and then used The coil merging coefficient and the distribution structure of the data to be collected in the frame to be filled are used to fill in the ...

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Abstract

The invention discloses a method and device for reconstructing a magnetic resonance k space and a magnetic resonance imaging method and device. The key space reconstruction method comprises the following steps: a, continuously acquiring multi-frame k space data in an imaging area, wherein the acquisition directions of at least two frames of data are different; b, determining the coil combination coefficient of any frame serving as a to-be-filled frame in the multi-frame data by using data acquired in the to-be-filled frame and data acquired from other frames in different acquisition directions from the to-be-filled frame; c, calculating under-acquired data in the to-be-filled frame according to the coil combination coefficient, and filling to obtain complete k space data of the to-be-filled frame; d, calculating according to the previous steps to obtain complete k space data of all frames. By adopting the technical scheme, the acquisition time of additional calibrate data in magnetic resonance imaging data can be shortened, data acquisition is reduced, the imaging speed is increased, and filling errors caused by variation of adjacent frame data are reduced.

Description

[0001] technical field [0002] The invention relates to the field of magnetic resonance imaging, in particular to a magnetic resonance k-space reconstruction method and device, and a magnetic resonance imaging method and device. [0003] Background technique [0004] Magnetic resonance imaging (MRI) is a medical imaging technique that visualizes the internal structure of the human body. It mainly uses the electromagnetic properties of atomic nuclei in the human body to generate images. Magnetic resonance images have good image contrast for different soft tissues in the human body, so they have better imaging effects in the diagnosis of brain, muscle, heart, and cancer cells than other medical imaging techniques such as CT and X-ray , and there is no harm from ionizing radiation. However, most MRI methods require long scan times, for example, a classical spin echo image takes between 15-30 seconds. The slow imaging speed greatly limits the time resolution of images in dyn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/54
Inventor 翟人宽
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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