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Poster

Small-scale Phase and Magnitude fluctuations in fMRI time series

MPS-Authors
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Hagberg,  G
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons83793

Balla,  D
Former Department MRZ, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons84317

Wiesner,  HM
Former Department MRZ, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons84063

Logothetis,  NK
Max Planck Institute for Biological Cybernetics, Max Planck Society;
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

External Resource

https://www.ismrm.org/11/EPF2.htm
(Abstract)

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Citation

Hagberg, G., Balla, D., Wiesner, H., & Logothetis, N. (2011). Small-scale Phase and Magnitude fluctuations in fMRI time series. Poster presented at 19th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2011), Montréal, Canada.


Cite as: https://hdl.handle.net/21.11116/0000-0002-4F86-F
Abstract
We investigated localized fluctuations during resting state dynamics of 7T phase and magnitude fMRI signals (voxels of 98 and 64nl) at two echo times (13 and 36ms) in rats. We could confirm the presence of TE-dependent signal fluctuations mediated by BOLD susceptibility that was greatest in voxels with strong vascular components and decreased with the distance from such areas. Interestingly, both high phase and magnitude instabilities were observed in the callosal fibers, containing oriented white matter structures. In view of differences in susceptibility between these structures and the surrounding grey matter these fluctuations may result from minute displacements caused for instance by heart pulsations.