Feasibility of Ultra-Short EPI Navigator for DTI Motion Detection

Hu Cheng¹

Information of head rotation during DTI data acquisition is critical for reliable fiber tracking. However, the information can be erroneously extracted by decomposing the affine matrix from image registration because of image distortions induced by Eddy current. In this work, we examined the feasibility of retrospective motion correction by using an ultra-short EPI navigator via GRAPPA operators. Based on the simulated data from real EPI scans, it is possible to use only three K-space lines to obtain accurate between-volume head motion. Our results are encouraging for implementing this technique in DTI pulse sequence.