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Realignment strategies for awake monkey fMRI data, Magnetic Resonance Imaging

journal contribution
posted on 2023-06-08, 13:30 authored by Steffen Stoewer, Jozien Goense, Georgios A Keliris, Andreas Bartels, Nikos K Logoththetis, John Duncan, Natasha SigalaNatasha Sigala
Functional magnetic resonance imaging (fMRI) experiments with awake nonhuman primates (NHPs) have recently seen a surge of applications. However, the standard fMRI analysis tools designed for human experiments are not optimal for NHP data collected at high fields. One major difference is the experimental setup. Although real head movement is impossible for NHPs, MRI image series often contain visible motion artifacts. Animal body movement results in image position changes and geometric distortions. Since conventional realignment methods are not appropriate to address such differences, algorithms tailored specifically for animal scanning become essential. We have implemented a series of high-field NHP specific methods in a software toolbox, fMRI Sandbox (http://kyb.tuebingen.mpg.de/~stoewer/), which allows us to use different realignment strategies. Here we demonstrate the effect of different realignment strategies on the analysis of awake-monkey fMRI data acquired at high field (7 T). We show that the advantage of using a nonstandard realignment algorithm depends on the amount of distortion in the dataset. While the benefits for less distorted datasets are minor, the improvement of statistical maps for heavily distorted datasets is significant

History

Publication status

  • Published

Journal

Magnetic Resonance Imaging

ISSN

0730-725X

Publisher

Elsevier

Issue

10

Volume

29

Page range

1390-1400

Department affiliated with

  • Clinical and Experimental Medicine Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-11-13

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