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Abstract #1416

Clinical relevance of EPI distortion correction in presurgical fMRI at 7T

Barbara Dymerska 1 , Florian Fischmeister 1,2 , Alexander Geissler 1,2 , Eva Matt 1,2 , Siegfried Trattnig 1 , Roland Beisteiner 1,2 , and Simon Robinson 1

1 Departement of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Vienna, Austria, 2 Department of Neurology, Medical University of Vienna, Vienna, Vienna, Austria

FMRI is increasingly being applied in presurgical planning. Although ultra-high field provides higher tSNR it also induces stronger geometric distortions. We investigate the clinical relevance of distortion correction using B0 field maps. Analysis of eight patients performing hand and chin tasks at 7T revealed that neglecting geometric distortions could lead to the misidentification of the central sulcus. Moreover, the distance between the pathology and activation could be wrongly estimated, which could affect decisions about resection margins. It is therefore important to correct for distortions in patient fMRI data to ensure that reliable clinical decisions are made.

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