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Abstract #4939

fMRI Finger Representations in the Primary Somatosensory Cortex at 3T – Parallel Imaging vs. Partial Fourier Techniques for the EPI Sequence

Claudia Fellner1, Marc Ruewe2, Silvan Klein2, Sebastian M. Frank3, Andreas Eigenberger2, Alexandra M. Anker2, Daniel Deuter4, Michael Knott1, and Katharina Rosengarth4
1Department of Radiology, University Hospital Regensburg, Regensburg, Germany, 2Department for Plastic, Hand and Reconstructive Surgery, University Hospital Regensburg, Regensburg, Germany, 3Institute for Experimental Psychology, University of Regensburg, Regensburg, Germany, 4Department of Neurosurgery, University Hospital Regensburg, Regensburg, Germany

Synopsis

Keywords: Peripheral Nerves, Acquisition Methods

Motivation: fMRI is usually applied with either parallel imaging (PAT2) or partial Fourier (pFOU), but there is no systematic comparison between both techniques.

Goal(s): Mapping of the somatotopic representation of each finger as a demanding task was selected to address the advantages and disadvantages of both techniques and to further optimize it for clinical application.

Approach: PAT2 and pFOU were compared for fMRI of the sensorimortor cortex in 5 healthy volunteers with independent tactile stimulation of each fingertip.

Results: Both techniques revealed comparable results for somatopy, but PAT2 allowed a larger number of slices; 200 instead of 300 measurement seem to be sufficient.

Impact: fMRI with parallel imaging instead of partial Fourier, a voxel size of (1.5mm)3 and 200 measurements seems to be a reliable technique at 3T for mapping finger representations in somatosensory cortex, which is also well suited for application in patients.

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Keywords