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要旨:
Echo Planar Imaging (EPI) is sensitive to off-resonances which induce apparent motion along the phase encoding direction. This occurs during respiration which induces B0 fluctuations in the brain, due to magnetic susceptibility phenomenons1-4. At 7 Tesla, such Respiration Induced Resonance Offset (RIRO) can reach up to 5 Hz in the brain4, and a correction based on a linear phase-shift in the k-space has been introduced5. However, while RIRO variation through a XY plane is limited, it increases substantially along Z towards the lungs1,4. A linear phase shift in the k-space is not expected to correct for components varying in space. We introduce a correction in the hybrid Time-Space domain taking δ_upper;B0 variation along Z into account.
