Meeting Banner
Abstract #2683

The impact of geometric distortions and their correction on fMRI data analyses

Rodolfo Abreu1, Miguel Castelo-Branco1,2, and João Valente Duarte1,2
1Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra, Coimbra, Portugal, 2Faculty of Medicine, University of Coimbra, Coimbra, Portugal

The impact of geometric distortions on fMRI data analyses has been scarcely investigated, and a direct comparison between fMRI distortion correction approaches has not been performed so far. Here, we found that correcting the distortions from phase-reversed or field map images improved the registration into structural data, the identification of resting-state networks, and the mapping sensitivity of task-related activations, relatively to not correcting the distortions. Accounting for fMRI distortions is recommended, with the use of field map images yielding the best results at the cost of longer scanning times when compared to acquiring a few phase-reversed fMRI volumes.

This abstract and the presentation materials are available to members only; a login is required.

Join Here