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A correction algorithm in the hybrid time-space domain accounting for Z-spatial dependence of respiration induced resonance offsets in sagittal EPI at 7 Tesla

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Zitation

Van de Moortele, P., Pfeuffer, J., Glover, G., Ugurbil, K., & Hu, X. (2002). A correction algorithm in the hybrid time-space domain accounting for Z-spatial dependence of respiration induced resonance offsets in sagittal EPI at 7 Tesla. Poster presented at 19th Annual Meeting of the European Society for Magnetic Resonance in Medicine and Biology (ESMRMB 2002), Cannes, France.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0013-DF44-7
Zusammenfassung
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.