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Abstract #0711

Band-free whole-brain alternating SSFP fMRI provides distortion-free activation maps in the visual cortex at 7T

Olivier Reynaud1, Ileana Ozana Jelescu1, and Rolf Gruetter1

1Center for Biomedical Imaging (CIBM), EPFL, Lausanne, Switzerland

Although the potential of bSSFP for fMRI has been previously demonstrated, the use of bSSFP remains limited at high field due to the presence of banding artefacts. We demonstrate here that a modified bSSFP sequence with alternating phase cycles (0/180°) can provide distortion-free and band-free fMRI images at 7 Tesla with a wide coverage (72 mm), and temporal / spatial resolution that match that of conventional EPI (2 mm isotropic, TRvolume=1.7 s), by combining water-selective spectro-spatial pulses and very high undersampling (12-fold) coupled with controlled aliasing (CAIPIRINHA).

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