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K-space motion artifact correction method and device

A technology of motion artifacts and k-space, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement using magnetic variables, etc., can solve problems such as serious overlapping and affecting imaging time, so as to reduce the impact and collect less data , The effect of speeding up the imaging speed

Active Publication Date: 2017-12-22
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PROPELLER technology repeatedly acquires in the k-space, and each acquisition repeats the acquisition of the central area, which seriously overlaps and affects the imaging time. It is only suitable for single-frame image imaging, and there is no motion artifact correction in dynamic MRI. application

Method used

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  • K-space motion artifact correction method and device

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Embodiment 1

[0070] First, step S101 is executed to continuously collect multiple frames of k-space data in the imaging region, the k-space data in each frame is obtained by at least one radio frequency excitation collection, and the collection directions of adjacent frames of data are different. What needs to be explained here is that compared with the prior art PROPELLER acquisition method, the PROPELLER technology does not collect multi-frame k-space data, and it has no concept of frame. It collects multiple sets of k-space data for one frame of image during acquisition, and each set The data is acquired by rotating and stepping in multiple acquisition directions continuously. The acquisition method in the present invention is to collect multi-frame k-space data, and the k-space data acquisition directions of adjacent frames are different. There is no need for a fixed rotation angle interval between the acquisition directions of each frame, and the advantage of such acquisition is that t...

Embodiment 2

[0094] In this embodiment, the difference from Embodiment 1 is that the k-space data acquisition method of each frame in this embodiment is as follows Figure 6 As shown, here only the acquisition data of the first frame of k-space is illustrated, and the data is obtained through three radio frequency excitation acquisitions, and the data acquisition method of each subsequent frame is the same. Therefore, in this embodiment, each frame of data is divided into three groups, and each group is the data collected by a radio frequency excitation, and each group of data corresponds to Figure 6 The solid line part, the broken line part and the dotted line part are shown. In the implementation of this practical example, the specific grouping is determined according to the data collection situation. The data collected after one excitation is divided into one group, and the number of groups is not limited to two or three groups.

[0095] The rigid body motion correction process is the...

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Abstract

The present invention discloses a k-space motion artifact correction method and device. The k-space motion artifact correction method includes the following steps: S101, continuously collecting multiple frames of k-space data in the imaging area, and the k-space data in each frame The data is obtained by at least one radio frequency excitation acquisition, and the acquisition directions of adjacent frame data are different; S102, the data obtained by one radio frequency excitation acquisition in each frame is divided into one group; S103, a data group in the previous frame is used as For the standard group, the data group in the next frame is used as the group to be corrected, and the data of the standard group is used to correct the data of the group to be corrected, and the data correction of each frame data group is completed in turn; S104, each frame after data correction The data group is filled back into the k-space of the corresponding frame to obtain the corrected k-space data of each frame. The method can alleviate the impact of unexpected movement on imaging, reduce the impact of imaging on patients, collect less data, and speed up imaging.

Description

technical field [0001] The invention relates to k-space artifact correction, in particular to a k-space motion artifact correction method and device. Background technique [0002] Magnetic resonance imaging equipment is an imaging equipment that can detect hydrogen atom signals in human organs and tissues and form images that can be used for medical diagnosis. The magnetic resonance equipment provides a high-intensity polarized magnetic field, a gradient field for spatial encoding, and a radio frequency field that causes the resonance phenomenon of hydrogen atoms in human organs and tissues to generate a resonance signal in the examination area, and the resonance signal generated by it is received by the radio frequency The signal received by the coil is processed by the subsequent equipment and finally transformed into a diagnostic image that can distinguish different tissues. It has a better imaging effect on soft tissues, so it is more widely used in the diagnosis of bra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/56
Inventor 翟人宽
Owner SHANGHAI UNITED IMAGING HEALTHCARE