Method and device for eliminating motion artifact of K spacial sampled data in MRI system

Abstract

The invention relates to a method and a device for eliminating motion artifact of K spacial sampled data in a magnetic resonance imaging (MRI) system. The method comprises the following steps of: sampling data; preprocessing the data, namely ensuring the consistency of echo signal intensity, and moving the echo maximum to the center; estimating rotary motion, namely searching echo reference pairsbetween a rotary data tape and a basis data tape by utilizing frequency domain similarity, calculating relative angle offset among the reference pairs, establishing a rotary motion equation set, and introducing a constraint condition to solve rotary motion parameters; estimating translational motion, namely establishing a translational equation set to solve translational motion parameters according to a data consistency principle equivalent equation and the rotation angle obtained in the last step; compensating motion parameters, namely performing motion compensation on the motion parameters solved in the step 3 and the step 4; and performing filtered backprojection weighted reestablishment, namely adopting a filtered backprojection method for weighted reestablishment. The method or the device can effectively inhibit motion artifact.

Description

technical field [0001] The invention relates to a motion artifact elimination method and device for K-space sampling data in an MRI system. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is one of the most advanced medical imaging methods, and it has been more and more widely used in clinical practice and scientific research. During the MRI process, the patient's voluntary and physiological movement is often unavoidable, which will destroy the data acquisition process and form artifacts on the resulting image, making it difficult for doctors to make a correct diagnosis. Due to the uncertainty of motion and the difficulty of obtaining prior knowledge of motion, it is very difficult to correct motion artifacts, which seriously affects and hinders the development and application of magnetic resonance imaging technology. Therefore, the research on the method of MRI motion artifact elimination has aroused extensive attention of scholar...

AI Technical Summary

Problems solved by technology

[0004] The first technical problem to be solved by the present invention is to provide a method for eliminating motion artifacts of K-space sampling data in an MRI system for the above-mentioned prior art. Long, large amount of data, and high computational cost in the reconstruction process

[0005] The second technical problem to be solved by the present invention is to provide a motion artifact elimination device for K-space sampling data in an MRI system in view of the above-mentioned prior art. Using this device can effectively suppress motion artifacts and avoid data oversampling that leads to acquisition The problems of long time, large amount of data, and high computational cost of the reconstruction process

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