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MRI快速序列的旋转伪影校正

Rotational Motion Artifact Correction to MRI Sequences Based on Fast Scanning

  • 摘要: 磁共振扫描过程中病人的旋转运动会在图像上造成伪影,严重影响诊断效果,提出一种基于快速扫描序列的旋转伪影校正算法以解决此问题.该算法首先提出K空间带状划分方法,通过旋转数据带产生数据重叠;然后建立重叠区正则化相似度判定准则,计算出旋转参数并校正数据带的位置信息;再根据K空间的厄米特共轭性质对校正后的不均匀数据进行补偿,并改进了Jackson网格化成像算法,使旋转伪影得到抑制.实验结果表明,该算法可以有效地消除旋转伪影,且计算速度快、准确率高、受噪声影响小.

     

    Abstract: 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.

     

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