Research Article

Effective Preprocessing Procedures Virtually Eliminate Distance-Dependent Motion Artifacts in Resting State FMRI

Figure 2

Improved motion correction by adding despiking step. The 6 motion estimates are from time frames in the corresponding video file (Supplementary Material S1). The upper and lower rows show the rotation and translation estimates, respectively, and the left and right columns show the motion estimates from the volume registration of FMRI data processed by pipelines starting without and with despiking, respectively. Registration without despiking resulted in visible residual motion between the 60th and 65th time frames. This suggests that the more elevated motion estimates obtained without despiking are less accurate than those with despiking. The subject used is sub0015004, who had the largest head movements in the children group.