Memory-related hippocampal activity can be measured robustly using fMRI at 7 Tesla

Nina Theysohn*, Shaozheng Qin, Stefan Maderwald, Benedikt A. Poser, Jens M. Theysohn, Mark E. Ladd, David G. Norris, Elke R. Gizewski, Guillen Fernandez, Indira Tendolkar

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

High field strength functional magnetic resonance imaging (fMRI) has developed rapidly. However, it suffers from increased artifacts in brain regions such as the medial temporal lobe (MTL), challenging functional imaging of the hippocampus with the objective of high-spatial resolution, which is particularly useful for this region both from a clinical and cognitive neuroscience perspective. We set out to compare a BOLD sequence at 7 T versus 3 T to visualize the MTL activity during an associative memory-encoding task. Twenty-eight healthy volunteers underwent a blocked-design fMRI at either 3 T or 7 T while performing a face-profession associative memory encoding task. Qualitative analyses of overall image quality revealed that functional images at 7 T were of high quality, showing a good white/gray matter contrast, with reasonably acceptable signal dropouts and artifacts at the lower portion of the temporal lobe. Analyses of task-related fMRI data revealed robust activations in the bilateral MTL during associative memory encoding at both field strengths. Notably, we observed significantly stronger memory-related hippocampal activation at 7 T than at 3 T, suggesting higher BOLD sensitivity at 7 T. These results are discussed in the light of the feasibility of 7 T scanning protocols for the MTL.

Original languageEnglish
Pages (from-to)445-451
Number of pages7
JournalJournal of Neuroimaging
Volume23
Issue number4
Early online date10 Jun 2013
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

Keywords

  • 7T
  • FMRI
  • Hippocampus
  • Memory
  • Ultra-high field strength MRI
  • n/a OA procedure

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