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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

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.

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Van de Moortele, PF, Author
Pfeuffer, J1, Author              
Glover , GH, Author
Ugurbil, K, Author
Hu, X, Author
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 Abstract: 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.

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 Dates: 2002-08
 Publication Status: Published online
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 Identifiers: BibTex Citekey: 1556
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Title: 19th Annual Meeting of the European Society for Magnetic Resonance in Medicine and Biology (ESMRMB 2002)
Place of Event: Cannes, France
Start-/End Date: 2002-08-22 - 2002-08-25

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Title: 19th Annual Meeting of the European Society for Magnetic Resonance in Medicine and Biology (ESMRMB 2002)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 351 Start / End Page: - Identifier: -