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Abstract #5050

Simultaneous interleaved blip up/down readout for dynamic off-resonance correction in functional EPI

Benjamin Zahneisen1, Murat Aksoy1, and Julian Maclaren1

1Stanford University, Stanford, CA, United States

Motion and geometric distortions of EPI acquisitions remain challenging as motion during an fMRI scan affects the stability of the time series in two ways: Rigid motion displaces voxels by “moving” the spins. A change in head orientation and the complex interplay of external and internal susceptibility differences lead to a change in the off-resonance field. In combination with an EPI readout this change in off-resonance field leads to an “apparent” voxel displacement. Here, we propose the simultaneous acquisition of a blip-down navigator with the original blip-up host-EPI sequence which is used to derive a snapshot of dynamic off-resonance changes.

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