Position-history and spin-history artifacts in fMRI time-series

L Muresan*, R Renken, JBTM Roerdink, H Duifhuis

*Bijbehorende auteur voor dit werk

    Onderzoeksoutput: Conference contributionAcademicpeer review

    9 Citaten (Scopus)

    Samenvatting

    What is the impact of the spin history and position history on signal intensity after the alignment of acquired volumes? This question arises in many fMRI studies. We will focus on spin-history artefacts generated by the position-history of the scanned object. In fMRI an object is driven to steady state by applying a few dummy scans at the start of each measurement. A change in object position will disrupt the tissue's steady state magnetization. The disruption will propagate to the next few acquired volumes until a steady state is reached again. The variables which are involved in changing the longitudinal magnetization are: the shape and the position of the slice profiles, the times at which RF pulses occurred, the equilibrium magnetization map and the T, map. Knowledge of these variables enables the prediction of those situations and the locations where the spin-history may compromise the fMRI analysis. In this paper we present a simulation of spin-history artefacts. The simulation shows that these effects, following a displacement, are similar to the transient period at the beginning of the measurement. Introducing gaps between the acquired slices increases these artefacts.

    Originele taal-2English
    TitelMEDICAL IMAGING 2002: PHYSIOLOGY AND FUNCTION FROM MULTIDIMENSIONAL IMAGES
    RedacteurenAN Clough, CT Chen
    Plaats van productieBELLINGHAM
    UitgeverijSPIE - INT SOC OPTICAL ENGINEERING
    Pagina's444-451
    Aantal pagina's8
    ISBN van geprinte versie0-8194-4428-6
    StatusPublished - 2002
    EvenementMedical Imaging 2002 Conference - , Canada
    Duur: 24-feb-200228-feb-2002

    Publicatie series

    NaamPROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
    UitgeverijSPIE-INT SOC OPTICAL ENGINEERING
    Volume4683
    ISSN van geprinte versie0277-786X

    Other

    OtherMedical Imaging 2002 Conference
    LandCanada
    Periode24/02/200228/02/2002

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