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T using a S 2-SSFP-EPI sequence

Introduction: It has been hypothesized that T2-weighted BOLD fMRI at ultra-high field shows higher spatial specificity than T2*weighted BOLD, since the main signal contribution is expected to come from the extravascular spins of the microvasculature [1-3]. Unfortunately, the number of slices that can be acquired in multi-slice SE-EPI is often highly limited at ultra-high field due to SAR constraints [1]. T2-weighted steady-state sequences, such as balanced SSFP and unbalanced S2-SSFP, have been previously used as an alternative to spin-echo based sequences in BOLD fMRI [4-6]. In this work, we present a 3D S2-SSFP sequence that is accelerated using an EPI readout in slice direction and show first results from finger tapping experiments at 9.4 T.