Temporal interpolation alters motion in fMRI scans: Magnitudes and consequences for artifact detection.

ABSTRACT: Head motion can be estimated at any point of fMRI image processing. Processing steps involving temporal interpolation (e.g., slice time correction or outlier replacement) often precede motion estimation in the literature. From first principles it can be anticipated that temporal interpolation will alter head motion in a scan. Here we demonstrate this effect and its consequences in five large fMRI datasets. Estimated head motion was reduced by 10-50% or more following temporal interpolation, and reductions were often visible to the naked eye. Such reductions make the data seem to be of improved quality. Such reductions also degrade the sensitivity of analyses aimed at detecting motion-related artifact and can cause a dataset with artifact to falsely appear artifact-free. These reduced motio

SUBMITTER: Power JD 

PROVIDER: S-EPMC5589107 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature