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The effect of acquisition resolution on orientation decoding from V1: comparison of 3T and 7T

Ayan Sengupta, Oliver Speck, Renat Yakupov, Martin Kanowski, Claus Tempelmann, Stefan Pollmann, Michael Hanke
doi: https://doi.org/10.1101/305417
Ayan Sengupta
aDepartment of Experimental Psychology, Institute of Psychology, Otto-von-Guericke University, Universitätsplatz 2, 39016 Magdeburg, Germany
bSir Peter Mansfield Imaging Centre, University of Nottingham, UK
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  • For correspondence: ayan.sengupta@nottingham.ac.uk
Oliver Speck
cDepartment of Biomedical Magnetic Resonance, Institute for Experimental Physics, Otto-von-Guericke University, Leipziger Str. 44, 39120 Magdeburg, Germany
dCenter for Behavioral Brain Sciences, Otto-von-Guericke University, Universitätsplatz 2, 39016 Magdeburg, Germany
eLeibniz Institute for Neurobiology, Brenneckestr. 6, 39118 Magdeburg, Germany
fGerman Center for Neurodegenerative Disease (DZNE), site Magdeburg, Leipziger Straβe 44, Germany
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Renat Yakupov
cDepartment of Biomedical Magnetic Resonance, Institute for Experimental Physics, Otto-von-Guericke University, Leipziger Str. 44, 39120 Magdeburg, Germany
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Martin Kanowski
hDepartment of Neurology, Otto-von-Guericke University, Leipziger Str. 44, 39120 Magdeburg, Germany
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Claus Tempelmann
hDepartment of Neurology, Otto-von-Guericke University, Leipziger Str. 44, 39120 Magdeburg, Germany
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Stefan Pollmann
aDepartment of Experimental Psychology, Institute of Psychology, Otto-von-Guericke University, Universitätsplatz 2, 39016 Magdeburg, Germany
dCenter for Behavioral Brain Sciences, Otto-von-Guericke University, Universitätsplatz 2, 39016 Magdeburg, Germany
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Michael Hanke
bSir Peter Mansfield Imaging Centre, University of Nottingham, UK
dCenter for Behavioral Brain Sciences, Otto-von-Guericke University, Universitätsplatz 2, 39016 Magdeburg, Germany
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Abstract

Previously published results indicate that the accuracy of decoding visual orientation from 7 Tesla fMRI data of V1 peaks at spatial acquisition resolutions that are routinely accessible with more conventional 3 Tesla scanners. This study directly compares the decoding performance between a 3 Tesla and a 7 Tesla dataset that were acquired using the same stimulation paradigm by applying an identical analysis procedure. The results indicate that decoding models built on 3 Tesla data are comparatively impaired. Moreover, we found no evidence for a strong coupling of BOLD signal change magnitude or temporal signal to noise ratio (tSNR) with decoding performance. Direct enhancement of tSNR via multiband fMRI acquisition at the same resolution did not translate into improved decoding performance. Additional voxel selection can boost 3 Tesla decoding performance to the 7 Tesla level only at a 3 mm acquisition resolution. In both datasets the BOLD signal available for orientation decoding is spatially broadband, but, consistent with the size of the BOLD point-spread-function, decoding models at 3 Tesla utilize spatially coarser image components.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted April 22, 2018.
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The effect of acquisition resolution on orientation decoding from V1: comparison of 3T and 7T
Ayan Sengupta, Oliver Speck, Renat Yakupov, Martin Kanowski, Claus Tempelmann, Stefan Pollmann, Michael Hanke
bioRxiv 305417; doi: https://doi.org/10.1101/305417
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The effect of acquisition resolution on orientation decoding from V1: comparison of 3T and 7T
Ayan Sengupta, Oliver Speck, Renat Yakupov, Martin Kanowski, Claus Tempelmann, Stefan Pollmann, Michael Hanke
bioRxiv 305417; doi: https://doi.org/10.1101/305417

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