Rotational Motion Artifact Correction to MRI Sequences Based on Fast Scanning

In the process of MRI scan,patient's rotational motion causes the artifacts on the images,and affects the diagnosis seriously.This paper presents a method to solve the problem for the fast scanning sequences.By the method firstly,the whole K-space is divided into several data strips,and the rotational angles from the similarity of the overlapped data between the rotational strips are calculated,to correct the coordinates of data strips.Secondly,the density of the sampled data is compensated based on the property of Hermite conjugates,and then the corrected image is obtained by the promoted Jackson gridding method.Experimental results show that the proposed algorithm can be used to remove the rotational artifacts efficiently,with high speed and accuracy,and the noise generates little influence to the final results.