Method of eliminating motion false image using PROPELLER sampling mode in T1 weighted magnetic resaonance imaging

A magnetic resonance imaging and motion artifact technology, which is applied in the directions of measurement, magnetic resonance measurement, and application using a nuclear magnetic resonance imaging system, can solve the problems of low accuracy and robustness of motion estimation, and unsatisfactory motion artifact elimination effect, etc. Achieve the effect of reducing the search step size, improving the accuracy and robustness, and speeding up the operation of the algorithm

Inactive Publication Date: 2007-07-25
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

However, for T1-weighted imaging, in the acquisition and reconstruction algorithm of PROPELLER method, the accuracy and robustness of motion estimation based on K space domain correlation are low, resulting in unsatisfactory effect of motion artifact elimination

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  • Method of eliminating motion false image using PROPELLER sampling mode in T1 weighted magnetic resaonance imaging
  • Method of eliminating motion false image using PROPELLER sampling mode in T1 weighted magnetic resaonance imaging
  • Method of eliminating motion false image using PROPELLER sampling mode in T1 weighted magnetic resaonance imaging

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Embodiment Construction

[0029] The present invention implements six steps, specifically as follows:

[0030] Step 1 data collection. Design the sampling method according to Fig. 1, the number of K-space bands and the number of phase encoding lines in the band can be flexibly set. In the experiment of the present invention, it is set as: one K-space bar is collected every 10 degrees, and 18 pieces are collected in total, and each K-space 24 lines of phase encoding lines are collected, each phase encoding line samples 256 data, and the average number of times of signal superposition is 1. Store the sampled data into a 3D array.

[0031] Step 2 phase correction. Due to the imperfection of the gradient system and the existence of eddy currents, the maximum value of each K-space zone does not appear at its center, which is a slow-changing phase change on the image, so it can be corrected by phase correction in the image domain. To ensure that the maximum value of the data appears in the center of each ...

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Abstract

A method for eliminating the moving pseudo-image in the T1 weighted magnetic resonance imaging system by use of PROPELLER sampling mode includes such steps as using PROPELLER mode to sample the T1 weighted imaging data, phase correcting in image domain, estimating the moving parameters according to the space data K in central overlapped sampling region on the basis of frequency domain association, iterative optimization search of moving parameters, moving compensation, and rebuilding image without moving pseudo-image interference.

Description

technical field [0001] The invention relates to an image processing method, in particular to a method for eliminating motion artifacts by using PROPELLER sampling in T1 weighted magnetic resonance imaging, which is used for medical magnetic resonance imaging processing. Background technique [0002] Magnetic resonance imaging (MRI) is one of the important inspection methods of medical imaging. Due to the long time of data acquisition, the movement of the patient often causes artifacts in the image and the image quality is seriously deteriorated. According to literature reports, in head magnetic resonance examination, in order to avoid the influence of motion, about 14% of the subjects need to take sedatives or go through anesthesia to get satisfactory images. Therefore, there is a huge clinical need to effectively correct motion artifacts, and it has always been a research hotspot in medical magnetic resonance imaging and is also one of the technical problems. [0003] Jame...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055G01R33/48G01R33/54
Inventor 冯衍秋陈武凡
Owner SOUTHERN MEDICAL UNIVERSITY
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