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  Small-scale Phase and Magnitude fluctuations in fMRI time series

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0002-4F86-F Version Permalink: https://hdl.handle.net/21.11116/0000-0002-4F87-E
Genre: Poster

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https://www.ismrm.org/11/EPF2.htm (Abstract)
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 Creators:
Hagberg, G1, 2, Author           
Balla, D1, 3, Author           
Wiesner, HM1, 3, Author           
Logothetis, NK1, 2, Author           
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
3Former Department MRZ, Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_2528700              

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 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.

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 Dates: 2011-05
 Publication Status: Issued
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Title: 19th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2011)
Place of Event: Montréal, Canada
Start-/End Date: 2011-05-07 - 2011-05-13

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Title: 19th Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2011)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 3637 Start / End Page: - Identifier: -