7T MRI is hoped to improve diagnostics, therapy and research of neurological diseases. Here, we characterize the influence of field strength on fMRI approaches including task based and RS-fMRI. Quality metrics revealed a basic separation of 3T and 7T fMRI data, mainly by tSNR, MDI, CNR and EFC. 7T fMRI showed higher BOLD response amplitudes, more functional connections and higher connectivity strength especially in inferior brain regions. Though higher variability between subjects at 7T likely requires enhanced statistical power in group comparisons, intra individual fMRI measurements might detect subtle connectivity changes at 7T useful for diagnosis and therapy.
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